The document discusses the differences between machine learning (ML), statistical learning, data mining (DM), and automated learning (AL). It argues that while ML and statistical learning developed similar techniques starting in the 1960s, DM emerged in the 1990s from a merging of database research and automated learning. However, industry was much more enthusiastic about adopting DM techniques compared to AL techniques, even though many DM systems are just friendly interfaces of AL systems. The document aims to explain the key differences between DM and AL that led to DM's greater commercial success.
A SYSTEM OF SERIAL COMPUTATION FOR CLASSIFIED RULES PREDICTION IN NONREGULAR ...ijaia
Objects or structures that are regular take uniform dimensions. Based on the concepts of regular models,
our previous research work has developed a system of a regular ontology that models learning structures
in a multiagent system for uniform pre-assessments in a learning environment. This regular ontology has
led to the modelling of a classified rules learning algorithm that predicts the actual number of rules needed
for inductive learning processes and decision making in a multiagent system. But not all processes or
models are regular. Thus this paper presents a system of polynomial equation that can estimate and predict
the required number of rules of a non-regular ontology model given some defined parameters.
A Magnified Application of Deficient Data Using Bolzano Classifierjournal ijrtem
Abstract: Deficient and Inconsistent knowledge are a pervasive and lasting problem in heavy information sets. However, basic accusation is attractive often used to impute missing data, whereas multiple imputation generates right value to replace. Consequently, variety of machine learning (ML) techniques are developed to reprocess the incomplete information. It is estimated multiple imputation of missing information in large datasets and the performance of MI focuses on several unsupervised ML algorithms like mean, median, standard deviation and Supervised ML techniques for probabilistic algorithm like NBI classifier. Such research is carried out employing a comprehensive range of databases, for which missing cases are first filled in by various sets of plausible values to create multiple completed datasets, then standard complete- data operations are applied to each completed dataset, and finally the multiple sets of results combine to generate a single inference. The main aim of this report is to offer general guidelines for selection of suitable data imputation algorithms based on characteristics of the data. Implementing Bolzano Weierstrass theorem in machine learning techniques to assess the functioning of every sequence of rational and irrational number has a monotonic subsequence and specify every sequence always has a finite boundary. For estimate imputation of missing data, the standard machine learning repository dataset has been applied. Tentative effects manifest the proposed approach to have good accuracy and the accuracy measured in terms of percent. Keywords: Bolzano Classifier, Maximum Likelihood, NBI classifier, posterior probability, predictor probability, prior probability, Supervised ML, Unsupervised ML.
This document discusses cognitive automation of data science tasks. It proposes that a cognitive system would incorporate knowledge from various structured and unstructured sources, past experiences, and user interactions to guide the machine learning process. It provides examples of how such a system could reason about issues like overfitting and user preferences to select appropriate algorithms and configurations. Key challenges for building such a cognitive system include knowledge representation, knowledge acquisition from multiple sources, and performing probabilistic reasoning on the knowledge to guide the automation process.
This document discusses applying a neural network approach to decision making in a self-organizing computing network (SOCN). It proposes using concepts from fuzzy logic and neural networks to build a computing network that can handle mixed data types, like symbolic and numeric data. The network would have input, hidden, and output layers connected by transfer functions. The hidden cells would self-organize based on training data to learn relationships between input and output cells. This approach aims to allow the network to make decisions on data sets with diverse attribute types in a more effective way than other techniques.
The document discusses data mining and knowledge discovery in databases. It defines data mining as the nontrivial extraction of implicit and potentially useful information from large amounts of data. With huge increases in data collection and storage, data mining aims to analyze data and discover patterns that can provide insights and knowledge about businesses and the real world. The data mining process involves selecting, preprocessing, transforming, and analyzing data to extract hidden patterns and relationships, which are then interpreted and evaluated.
Applying Machine Learning to Agricultural Databutest
This document discusses applying machine learning techniques to agricultural data. It describes a software tool called WEKA that allows experimenting with different machine learning algorithms on real-world datasets. As a case study, the document examines using machine learning to infer rules for culling less productive cows from dairy herd data. Several machine learning methods were tested on the data and produced encouraging results for using machine learning to help solve agricultural problems.
The document compares techniques for handling incomplete data when using decision trees. It investigates the robustness and accuracy of seven popular techniques when applied to different proportions, patterns and mechanisms of missing data in 21 datasets. The techniques include listwise deletion, decision tree single imputation, expectation maximization single imputation, mean/mode single imputation, and multiple imputation. The results suggest important differences between the techniques, with multiple imputation and decision tree single imputation generally performing better than the others. The choice of technique depends on factors like the amount and nature of the missing data.
The document examines using a nearest neighbor algorithm to rate men's suits based on color combinations. It trained the algorithm on 135 outfits rated as good, mediocre, or bad. It then tested the algorithm on 30 outfits rated by a human. When trained on 135 outfits, the algorithm incorrectly rated 36.7% of test outfits. When trained on only 68 outfits, it incorrectly rated 50% of test outfits, showing larger training data improves accuracy. It also tested using HSL color representation instead of RGB with similar results.
A SYSTEM OF SERIAL COMPUTATION FOR CLASSIFIED RULES PREDICTION IN NONREGULAR ...ijaia
Objects or structures that are regular take uniform dimensions. Based on the concepts of regular models,
our previous research work has developed a system of a regular ontology that models learning structures
in a multiagent system for uniform pre-assessments in a learning environment. This regular ontology has
led to the modelling of a classified rules learning algorithm that predicts the actual number of rules needed
for inductive learning processes and decision making in a multiagent system. But not all processes or
models are regular. Thus this paper presents a system of polynomial equation that can estimate and predict
the required number of rules of a non-regular ontology model given some defined parameters.
A Magnified Application of Deficient Data Using Bolzano Classifierjournal ijrtem
Abstract: Deficient and Inconsistent knowledge are a pervasive and lasting problem in heavy information sets. However, basic accusation is attractive often used to impute missing data, whereas multiple imputation generates right value to replace. Consequently, variety of machine learning (ML) techniques are developed to reprocess the incomplete information. It is estimated multiple imputation of missing information in large datasets and the performance of MI focuses on several unsupervised ML algorithms like mean, median, standard deviation and Supervised ML techniques for probabilistic algorithm like NBI classifier. Such research is carried out employing a comprehensive range of databases, for which missing cases are first filled in by various sets of plausible values to create multiple completed datasets, then standard complete- data operations are applied to each completed dataset, and finally the multiple sets of results combine to generate a single inference. The main aim of this report is to offer general guidelines for selection of suitable data imputation algorithms based on characteristics of the data. Implementing Bolzano Weierstrass theorem in machine learning techniques to assess the functioning of every sequence of rational and irrational number has a monotonic subsequence and specify every sequence always has a finite boundary. For estimate imputation of missing data, the standard machine learning repository dataset has been applied. Tentative effects manifest the proposed approach to have good accuracy and the accuracy measured in terms of percent. Keywords: Bolzano Classifier, Maximum Likelihood, NBI classifier, posterior probability, predictor probability, prior probability, Supervised ML, Unsupervised ML.
This document discusses cognitive automation of data science tasks. It proposes that a cognitive system would incorporate knowledge from various structured and unstructured sources, past experiences, and user interactions to guide the machine learning process. It provides examples of how such a system could reason about issues like overfitting and user preferences to select appropriate algorithms and configurations. Key challenges for building such a cognitive system include knowledge representation, knowledge acquisition from multiple sources, and performing probabilistic reasoning on the knowledge to guide the automation process.
This document discusses applying a neural network approach to decision making in a self-organizing computing network (SOCN). It proposes using concepts from fuzzy logic and neural networks to build a computing network that can handle mixed data types, like symbolic and numeric data. The network would have input, hidden, and output layers connected by transfer functions. The hidden cells would self-organize based on training data to learn relationships between input and output cells. This approach aims to allow the network to make decisions on data sets with diverse attribute types in a more effective way than other techniques.
The document discusses data mining and knowledge discovery in databases. It defines data mining as the nontrivial extraction of implicit and potentially useful information from large amounts of data. With huge increases in data collection and storage, data mining aims to analyze data and discover patterns that can provide insights and knowledge about businesses and the real world. The data mining process involves selecting, preprocessing, transforming, and analyzing data to extract hidden patterns and relationships, which are then interpreted and evaluated.
Applying Machine Learning to Agricultural Databutest
This document discusses applying machine learning techniques to agricultural data. It describes a software tool called WEKA that allows experimenting with different machine learning algorithms on real-world datasets. As a case study, the document examines using machine learning to infer rules for culling less productive cows from dairy herd data. Several machine learning methods were tested on the data and produced encouraging results for using machine learning to help solve agricultural problems.
The document compares techniques for handling incomplete data when using decision trees. It investigates the robustness and accuracy of seven popular techniques when applied to different proportions, patterns and mechanisms of missing data in 21 datasets. The techniques include listwise deletion, decision tree single imputation, expectation maximization single imputation, mean/mode single imputation, and multiple imputation. The results suggest important differences between the techniques, with multiple imputation and decision tree single imputation generally performing better than the others. The choice of technique depends on factors like the amount and nature of the missing data.
The document examines using a nearest neighbor algorithm to rate men's suits based on color combinations. It trained the algorithm on 135 outfits rated as good, mediocre, or bad. It then tested the algorithm on 30 outfits rated by a human. When trained on 135 outfits, the algorithm incorrectly rated 36.7% of test outfits. When trained on only 68 outfits, it incorrectly rated 50% of test outfits, showing larger training data improves accuracy. It also tested using HSL color representation instead of RGB with similar results.
Although artificial intelligence (AI) is currently one of the most interesting areas in scientific research, the potential threats posed by emerging AI systems remain a source of persistent controversy. To address the issue of AI threat,this study proposes
a “standard intelligence model” that unifies AI and human characteristics in terms of
four aspects of knowledge, i.e., input, output, mastery, and creation. Using this model, we observe three challenges, namely, expanding of the von Neumann architecture;
testing and ranking the intelligence quotient (IQ) of naturally and artificially intelligent systems, including humans, Google, Microsoft’s Bing, Baidu, and Siri; and
finally, the dividing of artificially intelligent systems into seven grades from robots to Google Brain. Based on this, we conclude that Google’s AlphaGo belongs to the third grade.
The document discusses machine learning approaches including decision trees, artificial neural networks, and evolutionary computation. It provides an overview of the theory behind each approach and the author's experience implementing and testing various algorithms. Specifically, the author examined decision tree algorithms like CART, neural network implementations for face recognition, and genetic algorithm applications like a Tron game that uses evolution to learn player strategies.
This document discusses mapping and visualizing the core of scientific domains using social network analysis techniques. It introduces the concept of a "Network of the Core" (NC) to represent relationships between theoretical constructs, models, and concepts. NCs can be directional, showing causal relationships, or directionless, showing general connections. NCs can reveal hidden characteristics of a research domain like central constructs. The document demonstrates directional and directionless NCs for information systems research domains. NCs help conceptualize domains, identify missing links, and explore research opportunities. Future work should construct more detailed NCs to analyze research domain structures.
Collnet turkey feroz-core_scientific domainHan Woo PARK
This document discusses mapping and visualizing the core of scientific domains using information systems research as an example. It introduces the concept of a "network of the core" (NC) to represent the theoretical constructs, models, and concepts within a research domain. An NC can be constructed to reveal characteristics like density, centrality, and bridges within a domain. Both causal and non-causal NCs are possible. Causal NCs show theoretical relationships between constructs, while non-causal NCs provide an overall picture. The document demonstrates an NC for an information systems outsourcing model and discusses additional issues like optional/mandatory nodes, directional vs. non-directional NCs, and their potential uses.
REPRESENTATION OF UNCERTAIN DATA USING POSSIBILISTIC NETWORK MODELScscpconf
Uncertainty is a pervasive in real world environment due to vagueness, is associated with the
difficulty of making sharp distinctions and ambiguity, is associated with situations in which the
choices among several precise alternatives cannot be perfectly resolved. Analysis of large
collections of uncertain data is a primary task in the real world applications, because data is
incomplete, inaccurate and inefficient. Representation of uncertain data in various forms such
as Data Stream models, Linkage models, Graphical models and so on, which is the most simple,
natural way to process and produce the optimized results through Query processing. In this
paper, we propose the Uncertain Data model can be represented as Possibilistic data model
and vice versa for the process of uncertain data using various data models such as possibilistic
linkage model, Data streams, Possibilistic Graphs. This paper presents representation and
process of Possiblistic Linkage model through Possible Worlds with the use of product-based
operator.
ROLE OF CERTAINTY FACTOR IN GENERATING ROUGH-FUZZY RULEIJCSEA Journal
The generation of effective feature-based rules is essential to the development of any intelligent system. This paper presents an approach that integrates a powerful fuzzy rule generation algorithm with a rough set-assisted feature reduction method to generate diagnostic rule with a certainty factor. Certainty factor of each rule is calculated by considering both the membership value of each linguistic term introduced at time of fuzzyfication of data as well as possibility values, due to inconsistent data, generated by rough set theory at time of rule generation. In time of knowledge inferencing in an intelligent system, certainty factor of each rule will play an important role to find out the appropriate rule to be selected. Experimental results demonstrate the superiority of our approach.
In this paper, I develop a custom binary classifier of search queries for the makeup category using different Machine Learning techniques and models. An extensive exploration of shallow and Deep Learning models was performed using a cross-validation framework to identify the top three models, optimize them tuning their hyperparameters, and finally creating an ensemble of models with a custom decision threshold that outperforms all other models. The final classifier achieves an accuracy of 98.83% on a test set, making it ready for production.
This document discusses classification using decision tree models. It begins with an introduction to classification, describing it as assigning objects to predefined categories. Decision trees are then overviewed as a powerful classifier that uses a hierarchical structure to split a dataset. Important parameters for evaluating model accuracy are covered, such as precision, recall, and AUC. The document also describes an exercise using the Weka tool to build decision trees on a dataset about term deposit subscriptions. It concludes with discussing uses of decision trees for applications like marketing and medical diagnosis.
To Explain, To Predict, or To Describe?Galit Shmueli
1) The document discusses the differences between explanatory, predictive, and descriptive modeling and evaluation. Explanatory modeling tests causal hypotheses, predictive modeling predicts new observations, and descriptive modeling approximates distributions or relationships.
2) It notes that these goals are different and the same model is not best for all three. Social sciences often focus on explanation while machine learning focuses on prediction.
3) The key aspects that differ for these three types of modeling are the theory, causation versus association, retrospective versus prospective analysis, and focusing on the average unit versus individual units. The best model for one goal is not necessarily best for the others.
- The document proposes a multi-view stacking ensemble method for drug-target interaction (DTI) prediction that combines predictions from multiple machine learning models trained on different drug and target feature view combinations.
- It generates 126 view combination datasets from 14 drug views and 9 target views, then trains extra trees, random forest, and XGBoost classifiers on each view combination. Predictions from these base models are then combined using a stacking ensemble with an extra trees meta-learner.
- The method is shown to outperform single models and voting ensembles, and calibration of the meta-learner and use of local imbalance measures provide further improvements to predictive performance on DTI prediction tasks.
Probabilistic Interestingness Measures - An Introduction with Bayesian Belief...Adnan Masood
This document discusses various approaches to measuring the interestingness of patterns discovered during data mining. It describes objective interestingness measures based only on the data, like conciseness, generality, reliability, peculiarity and diversity. Subjective measures take into account user knowledge and expectations, evaluating novelty and surprisingness. Semantic measures consider pattern semantics and explanations, focusing on utility and actionability. The document also discusses limitations of typical objective measures like support and confidence, and outlines subjective approaches involving user impressions at different levels of knowledge granularity.
Presentation at special event "To Explain or To Predict?" at Tel Aviv University, July 9, 2012. Event co-organized by the Israel Statistical Association and Tel Aviv University's Department of Statistics and OR.
This document provides a summary of approaches for performing sentiment analysis. It discusses document-level, sentence-level, and aspect-level sentiment analysis. At the document level, the entire document is classified as positive or negative. At the sentence level, each sentence's sentiment is determined. At the aspect level, the sentiments expressed towards specific aspects are identified. The document also outlines applications of sentiment analysis such as in e-commerce, brand/customer feedback analysis, and government use. Finally, it discusses sentiment classification approaches and levels.
The document discusses model interpretation and the Skater library. It begins with defining model interpretation and explaining why it is needed, particularly for understanding model behavior and ensuring fairness. It then introduces Skater, an open-source Python library that provides model-agnostic interpretation tools. Skater uses techniques like partial dependence plots and LIME explanations to interpret models globally and locally. The document demonstrates Skater's functionality and discusses its ability to interpret a variety of model types.
Survey: Biological Inspired Computing in the Network SecurityEswar Publications
Traditional computing techniques and systems consider a main process device or main server, and technique details generally
serially. They're non-robust and non-adaptive, and have limited quantity. Indifference, scientific technique details in a very similar and allocated manner, while not a main management. They're exceedingly strong, elastic, and ascendible. This paper offers a short conclusion of however the ideas from biology are will never to style new processing techniques and techniques that even have a number of the beneficial qualities of scientific techniques. Additionally, some illustrations are a device given of however these techniques will be used in details security programs.
This document describes a new genetic algorithm (GA)-based system for predicting the future performance of individual stocks. The system uses GAs for inductive machine learning rather than optimization. It is compared to a neural network system using data from over 1,600 stocks. The study finds that the GA system can predict stock returns 12 weeks in the future and that combining GA and neural network forecasts provides synergistic benefits.
The document discusses data analytics solutions involving machine learning and statistical modeling. It proposes splitting the solution into two parts: 1) applying algorithm techniques and statistical tests to data, and 2) making data-driven decisions using insights, metrics, and innovations. It then provides more details on machine learning techniques like training/testing data sets, and determining the optimal number of neurons in neural networks. Statistical modeling techniques like logistic regression, decision trees, and neural networks are recommended. The document emphasizes comparing different model results to identify ways to improve performance.
In order to solve the complex decision-making problems, there are many approaches and systems based on the fuzzy theory were proposed. In 1998, Smarandache introduced the concept of single-valued neutrosophic set as a complete development of fuzzy theory. In this paper, we research on the distance measure between single-valued neutrosophic sets based on the H-max measure of Ngan et al. [8]. The proposed measure is also a distance measure between picture fuzzy sets which was introduced by Cuong in 2013 [15]. Based on the proposed measure, an Adaptive Neuro Picture Fuzzy Inference System (ANPFIS) is built and applied to the decision making for the link states in interconnection networks. In experimental evaluation on the real datasets taken from the UPV (Universitat Politècnica de València) university, the performance of the proposed model is better than that of the related fuzzy methods.
Machine learning techniques can be used to detect outliers in trading data. The proposed system would use machine learning to train a model to identify outlier trades from input data and flag them for administrator approval. If approved, the trade would be submitted and the model retrained; if denied, the model would not be retrained. This approach allows the model to learn over time to better identify outlier trades. Support vector machines are one machine learning technique that could be used to classify trades as outliers or not based on training data. Identifying and addressing outliers can help reduce human errors and fraudulent trading activities.
The past two decades has seen a dramatic increase in the amount of information or data being stored in electronic format. This accumulation of data has taken place at an explosive rate. It has been estimated that the amount of information in the world doubles every 20 months and the size and number of databases are increasing even faster. The increase in use of electronic data gathering devices such as point-of-sale or remote sensing devices has contributed to this explosion of available data. Figure 1 from the Red Brick company illustrates the data explosion.
A Comparative Study of Various Data Mining Techniques: Statistics, Decision T...Editor IJCATR
In this paper we focus on some techniques for solving data mining tasks such as: Statistics, Decision Trees and Neural
Networks. The new approach has succeed in defining some new criteria for the evaluation process, and it has obtained valuable results
based on what the technique is, the environment of using each techniques, the advantages and disadvantages of each technique, the
consequences of choosing any of these techniques to extract hidden predictive information from large databases, and the methods of
implementation of each technique. Finally, the paper has presented some valuable recommendations in this field.
Although artificial intelligence (AI) is currently one of the most interesting areas in scientific research, the potential threats posed by emerging AI systems remain a source of persistent controversy. To address the issue of AI threat,this study proposes
a “standard intelligence model” that unifies AI and human characteristics in terms of
four aspects of knowledge, i.e., input, output, mastery, and creation. Using this model, we observe three challenges, namely, expanding of the von Neumann architecture;
testing and ranking the intelligence quotient (IQ) of naturally and artificially intelligent systems, including humans, Google, Microsoft’s Bing, Baidu, and Siri; and
finally, the dividing of artificially intelligent systems into seven grades from robots to Google Brain. Based on this, we conclude that Google’s AlphaGo belongs to the third grade.
The document discusses machine learning approaches including decision trees, artificial neural networks, and evolutionary computation. It provides an overview of the theory behind each approach and the author's experience implementing and testing various algorithms. Specifically, the author examined decision tree algorithms like CART, neural network implementations for face recognition, and genetic algorithm applications like a Tron game that uses evolution to learn player strategies.
This document discusses mapping and visualizing the core of scientific domains using social network analysis techniques. It introduces the concept of a "Network of the Core" (NC) to represent relationships between theoretical constructs, models, and concepts. NCs can be directional, showing causal relationships, or directionless, showing general connections. NCs can reveal hidden characteristics of a research domain like central constructs. The document demonstrates directional and directionless NCs for information systems research domains. NCs help conceptualize domains, identify missing links, and explore research opportunities. Future work should construct more detailed NCs to analyze research domain structures.
Collnet turkey feroz-core_scientific domainHan Woo PARK
This document discusses mapping and visualizing the core of scientific domains using information systems research as an example. It introduces the concept of a "network of the core" (NC) to represent the theoretical constructs, models, and concepts within a research domain. An NC can be constructed to reveal characteristics like density, centrality, and bridges within a domain. Both causal and non-causal NCs are possible. Causal NCs show theoretical relationships between constructs, while non-causal NCs provide an overall picture. The document demonstrates an NC for an information systems outsourcing model and discusses additional issues like optional/mandatory nodes, directional vs. non-directional NCs, and their potential uses.
REPRESENTATION OF UNCERTAIN DATA USING POSSIBILISTIC NETWORK MODELScscpconf
Uncertainty is a pervasive in real world environment due to vagueness, is associated with the
difficulty of making sharp distinctions and ambiguity, is associated with situations in which the
choices among several precise alternatives cannot be perfectly resolved. Analysis of large
collections of uncertain data is a primary task in the real world applications, because data is
incomplete, inaccurate and inefficient. Representation of uncertain data in various forms such
as Data Stream models, Linkage models, Graphical models and so on, which is the most simple,
natural way to process and produce the optimized results through Query processing. In this
paper, we propose the Uncertain Data model can be represented as Possibilistic data model
and vice versa for the process of uncertain data using various data models such as possibilistic
linkage model, Data streams, Possibilistic Graphs. This paper presents representation and
process of Possiblistic Linkage model through Possible Worlds with the use of product-based
operator.
ROLE OF CERTAINTY FACTOR IN GENERATING ROUGH-FUZZY RULEIJCSEA Journal
The generation of effective feature-based rules is essential to the development of any intelligent system. This paper presents an approach that integrates a powerful fuzzy rule generation algorithm with a rough set-assisted feature reduction method to generate diagnostic rule with a certainty factor. Certainty factor of each rule is calculated by considering both the membership value of each linguistic term introduced at time of fuzzyfication of data as well as possibility values, due to inconsistent data, generated by rough set theory at time of rule generation. In time of knowledge inferencing in an intelligent system, certainty factor of each rule will play an important role to find out the appropriate rule to be selected. Experimental results demonstrate the superiority of our approach.
In this paper, I develop a custom binary classifier of search queries for the makeup category using different Machine Learning techniques and models. An extensive exploration of shallow and Deep Learning models was performed using a cross-validation framework to identify the top three models, optimize them tuning their hyperparameters, and finally creating an ensemble of models with a custom decision threshold that outperforms all other models. The final classifier achieves an accuracy of 98.83% on a test set, making it ready for production.
This document discusses classification using decision tree models. It begins with an introduction to classification, describing it as assigning objects to predefined categories. Decision trees are then overviewed as a powerful classifier that uses a hierarchical structure to split a dataset. Important parameters for evaluating model accuracy are covered, such as precision, recall, and AUC. The document also describes an exercise using the Weka tool to build decision trees on a dataset about term deposit subscriptions. It concludes with discussing uses of decision trees for applications like marketing and medical diagnosis.
To Explain, To Predict, or To Describe?Galit Shmueli
1) The document discusses the differences between explanatory, predictive, and descriptive modeling and evaluation. Explanatory modeling tests causal hypotheses, predictive modeling predicts new observations, and descriptive modeling approximates distributions or relationships.
2) It notes that these goals are different and the same model is not best for all three. Social sciences often focus on explanation while machine learning focuses on prediction.
3) The key aspects that differ for these three types of modeling are the theory, causation versus association, retrospective versus prospective analysis, and focusing on the average unit versus individual units. The best model for one goal is not necessarily best for the others.
- The document proposes a multi-view stacking ensemble method for drug-target interaction (DTI) prediction that combines predictions from multiple machine learning models trained on different drug and target feature view combinations.
- It generates 126 view combination datasets from 14 drug views and 9 target views, then trains extra trees, random forest, and XGBoost classifiers on each view combination. Predictions from these base models are then combined using a stacking ensemble with an extra trees meta-learner.
- The method is shown to outperform single models and voting ensembles, and calibration of the meta-learner and use of local imbalance measures provide further improvements to predictive performance on DTI prediction tasks.
Probabilistic Interestingness Measures - An Introduction with Bayesian Belief...Adnan Masood
This document discusses various approaches to measuring the interestingness of patterns discovered during data mining. It describes objective interestingness measures based only on the data, like conciseness, generality, reliability, peculiarity and diversity. Subjective measures take into account user knowledge and expectations, evaluating novelty and surprisingness. Semantic measures consider pattern semantics and explanations, focusing on utility and actionability. The document also discusses limitations of typical objective measures like support and confidence, and outlines subjective approaches involving user impressions at different levels of knowledge granularity.
Presentation at special event "To Explain or To Predict?" at Tel Aviv University, July 9, 2012. Event co-organized by the Israel Statistical Association and Tel Aviv University's Department of Statistics and OR.
This document provides a summary of approaches for performing sentiment analysis. It discusses document-level, sentence-level, and aspect-level sentiment analysis. At the document level, the entire document is classified as positive or negative. At the sentence level, each sentence's sentiment is determined. At the aspect level, the sentiments expressed towards specific aspects are identified. The document also outlines applications of sentiment analysis such as in e-commerce, brand/customer feedback analysis, and government use. Finally, it discusses sentiment classification approaches and levels.
The document discusses model interpretation and the Skater library. It begins with defining model interpretation and explaining why it is needed, particularly for understanding model behavior and ensuring fairness. It then introduces Skater, an open-source Python library that provides model-agnostic interpretation tools. Skater uses techniques like partial dependence plots and LIME explanations to interpret models globally and locally. The document demonstrates Skater's functionality and discusses its ability to interpret a variety of model types.
Survey: Biological Inspired Computing in the Network SecurityEswar Publications
Traditional computing techniques and systems consider a main process device or main server, and technique details generally
serially. They're non-robust and non-adaptive, and have limited quantity. Indifference, scientific technique details in a very similar and allocated manner, while not a main management. They're exceedingly strong, elastic, and ascendible. This paper offers a short conclusion of however the ideas from biology are will never to style new processing techniques and techniques that even have a number of the beneficial qualities of scientific techniques. Additionally, some illustrations are a device given of however these techniques will be used in details security programs.
This document describes a new genetic algorithm (GA)-based system for predicting the future performance of individual stocks. The system uses GAs for inductive machine learning rather than optimization. It is compared to a neural network system using data from over 1,600 stocks. The study finds that the GA system can predict stock returns 12 weeks in the future and that combining GA and neural network forecasts provides synergistic benefits.
The document discusses data analytics solutions involving machine learning and statistical modeling. It proposes splitting the solution into two parts: 1) applying algorithm techniques and statistical tests to data, and 2) making data-driven decisions using insights, metrics, and innovations. It then provides more details on machine learning techniques like training/testing data sets, and determining the optimal number of neurons in neural networks. Statistical modeling techniques like logistic regression, decision trees, and neural networks are recommended. The document emphasizes comparing different model results to identify ways to improve performance.
In order to solve the complex decision-making problems, there are many approaches and systems based on the fuzzy theory were proposed. In 1998, Smarandache introduced the concept of single-valued neutrosophic set as a complete development of fuzzy theory. In this paper, we research on the distance measure between single-valued neutrosophic sets based on the H-max measure of Ngan et al. [8]. The proposed measure is also a distance measure between picture fuzzy sets which was introduced by Cuong in 2013 [15]. Based on the proposed measure, an Adaptive Neuro Picture Fuzzy Inference System (ANPFIS) is built and applied to the decision making for the link states in interconnection networks. In experimental evaluation on the real datasets taken from the UPV (Universitat Politècnica de València) university, the performance of the proposed model is better than that of the related fuzzy methods.
Machine learning techniques can be used to detect outliers in trading data. The proposed system would use machine learning to train a model to identify outlier trades from input data and flag them for administrator approval. If approved, the trade would be submitted and the model retrained; if denied, the model would not be retrained. This approach allows the model to learn over time to better identify outlier trades. Support vector machines are one machine learning technique that could be used to classify trades as outliers or not based on training data. Identifying and addressing outliers can help reduce human errors and fraudulent trading activities.
The past two decades has seen a dramatic increase in the amount of information or data being stored in electronic format. This accumulation of data has taken place at an explosive rate. It has been estimated that the amount of information in the world doubles every 20 months and the size and number of databases are increasing even faster. The increase in use of electronic data gathering devices such as point-of-sale or remote sensing devices has contributed to this explosion of available data. Figure 1 from the Red Brick company illustrates the data explosion.
A Comparative Study of Various Data Mining Techniques: Statistics, Decision T...Editor IJCATR
In this paper we focus on some techniques for solving data mining tasks such as: Statistics, Decision Trees and Neural
Networks. The new approach has succeed in defining some new criteria for the evaluation process, and it has obtained valuable results
based on what the technique is, the environment of using each techniques, the advantages and disadvantages of each technique, the
consequences of choosing any of these techniques to extract hidden predictive information from large databases, and the methods of
implementation of each technique. Finally, the paper has presented some valuable recommendations in this field.
The document discusses machine learning and learning agents in three main points:
1. It defines machine learning and discusses different types of machine learning tasks like supervised, unsupervised, and reinforcement learning.
2. It explains the key differences between traditional machine learning approaches and learning agents, noting that learning is one of many goals for agents and must be integrated with other agent functions.
3. It discusses different challenges of integrating machine learning into intelligent agents, such as balancing learning with recall of existing knowledge and addressing time constraints on learning from the environment.
A Survey Ondecision Tree Learning Algorithms for Knowledge DiscoveryIJERA Editor
Theimmense volumes of data are populated into repositories from various applications. In order to find out desired information and knowledge from large datasets, the data mining techniques are very much helpful. Classification is one of the knowledge discovery techniques. In Classification, Decision trees are very popular in research community due to simplicity and easy comprehensibility. This paper presentsan updated review of recent developments in the field of decision trees.
DALL-E 2 - OpenAI imagery automation first developed by Vishal Coodye in 2021...MITAILibrary
The document provides a review of machine learning interpretability methods. It begins with an introduction to explainable artificial intelligence and a discussion of key concepts like interpretability and explainability. It then presents a taxonomy of interpretability methods that are divided into four main categories: methods for explaining black-box models, creating white-box models, promoting fairness, and analyzing model sensitivity. Specific machine learning interpretability techniques are summarized within each category.
Introduction to feature subset selection methodIJSRD
Data Mining is a computational progression to ascertain patterns in hefty data sets. It has various important techniques and one of them is Classification which is receiving great attention recently in the database community. Classification technique can solve several problems in different fields like medicine, industry, business, science. PSO is based on social behaviour for optimization problem. Feature Selection (FS) is a solution that involves finding a subset of prominent features to improve predictive accuracy and to remove the redundant features. Rough Set Theory (RST) is a mathematical tool which deals with the uncertainty and vagueness of the decision systems.
This document summarizes and evaluates various rule extraction algorithms from trained artificial neural networks. It begins with an introduction explaining the importance of explanation capabilities for neural networks. It then provides a taxonomy for classifying rule extraction approaches based on the expressiveness of the extracted rules, whether the approach takes an open-box or black-box view of the neural network, any specialized training regimes used, the quality of explanations generated, and computational complexity. The document discusses sensitivity analysis as a basic method for understanding neural network relationships before focusing on decompositional and pedagogical rule extraction approaches.
Introduction to Artificial IntelligenceLuca Bianchi
Artificial intelligence has been defined in many ways as our understanding has evolved. Currently, AI is divided into narrow, general and super intelligence based on capabilities. Machine learning is a key approach in AI and involves algorithms that can learn from data to improve performance. Deep learning uses neural networks with many layers to learn representations of data and has achieved success in areas like computer vision and natural language processing.
This document discusses decision support systems (DSS). It describes DSS as using combinations of analytical tools like databases, spreadsheets, expert systems and neural networks to assist with decision making. Key features of DSS include handling large amounts of data, flexibility in reporting analysis, performing "what if" simulations and complex data analysis. DSS can be applied to structured, semi-structured or unstructured situations. Examples of DSS tools discussed include spreadsheets, expert systems and artificial neural networks. The document also covers topics like fuzzy logic, social/ethical issues, and suggests practical activities for students.
The development of data mining is inseparable from the recent developments in information technology that enables the accumulation of large amounts of data. For example, a shopping mall that records every sales transaction of goods using various POS (point of sales). Database data from these sales could reach a large storage capacity, even more being added each day, especially when the shopping center will develop into a nationwide network. The development of the internet at the moment also has a share large enough in the accumulation of data occurs. But the rapid growth of data accumulation it has created conditions that are often referred to as "data rich but information poor" because the data collected can not be used optimally for useful applications. Not infrequently the data set was left just seemed to be a "grave data". There are several techniques used in data mining which includes association, classification, and clustering. In this paper, the author will do a comparison between the performance of the technical classification methods naïve Bayes and C4.5 algorithms.
Incremental learning from unbalanced data with concept class, concept drift a...IJDKP
Recently, stream data mining applications has drawn vital attention from several research communities.
Stream data is continuous form of data which is distinguished by its online nature. Traditionally, machine
learning area has been developing learning algorithms that have certain assumptions on underlying
distribution of data such as data should have predetermined distribution. Such constraints on the problem
domain lead the way for development of smart learning algorithms performance is theoretically verifiable.
Real-word situations are different than this restricted model. Applications usually suffers from problems
such as unbalanced data distribution. Additionally, data picked from non-stationary environments are also
usual in real world applications, resulting in the “concept drift” which is related with data stream
examples. These issues have been separately addressed by the researchers, also, it is observed that joint
problem of class imbalance and concept drift has got relatively little research. If the final objective of
clever machine learning techniques is to be able to address a broad spectrum of real world applications,
then the necessity for a universal framework for learning from and tailoring (adapting) to, environment
where drift in concepts may occur and unbalanced data distribution is present can be hardly exaggerated.
In this paper, we first present an overview of issues that are observed in stream data mining scenarios,
followed by a complete review of recent research in dealing with each of the issue.
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1. The document discusses different types of machine learning algorithms including supervised learning, unsupervised learning, semi-supervised learning, reinforcement learning, transduction, and learning to learn.
2. It provides more detail on supervised learning and unsupervised learning. Supervised learning involves using labeled examples to generate a function that maps inputs to outputs, while unsupervised learning models a set of inputs without labeled examples.
3. The supervised learning process involves collecting a dataset, pre-processing the data by handling missing values and outliers, selecting relevant features, and training and evaluating a classifier on training and test sets.
THM1: Formalizing a problem as a prediction problem is often the most important contribution of a data scientist.
THM2: A predictor is an estimator, i.e. an algorithm which takes data and returns a prediction. Reality is stochastic, so data and predictions are stochastic.
THM3: Learning is challenging since data must be used both to create prediction models and to assess them. Bias and variance must be balanced to achieve good generalization.
Ontology based clustering algorithms aim to standardize clustering by incorporating domain knowledge through ontologies. They calculate similarity matrices between objects using ontology-based methods, then merge the closest clusters and recalculate the matrix in an iterative process. Several ontology based clustering algorithms are discussed, including Apriori, which generates frequent item sets to cluster data, and algorithms that use ontologies to weight features or perform recursive mining on an FP-tree. These algorithms integrate distributed semantic web data through ontologies to improve search, classification and reuse of knowledge resources.
Short Description about machine learning.What is machine learning? specifications , categories, terminologies and applications every thing is explained in short way.
The technology for building knowledge-based systems by inductive inference from examples has
been demonstrated successfully in several practical applications. This paper summarizes an approach to
synthesizing decision trees that has been used in a variety of systems, and it describes one such system,
ID3, in detail. Results from recent studies show ways in which the methodology can be modified to deal
with information that is noisy and/or incomplete. A reported shortcoming of the basic algorithm is
discussed and two means of overcoming it are compared. The paper concludes with illustrations of current
research directions.
This document provides an overview of machine learning. It begins with an introduction and definitions, explaining that machine learning allows computers to learn without being explicitly programmed by exploring algorithms that can learn from data. The document then discusses the different types of machine learning problems including supervised learning, unsupervised learning, and reinforcement learning. It provides examples and applications of each type. The document also covers popular machine learning techniques like decision trees, artificial neural networks, and frameworks/tools used for machine learning.
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1. Machine Learning and Data Mining
Yves Kodratoff
CNRS, LRI Bât. 490, Université Paris-Sud
91405 Orsay, yk@lri.fr
WORKING PAPER : ENGLISH VERSION OF
"Apprentissage et Fouille de Données" accepted for publication
Summary
Deep differences explain why Data Mining has been enthusiastically accepted by Industry, while
Machine Learning and Exploratory Statistics still have problems being accepted by it. This paper
points at all the epistemological, scientific, and industrial differences between the two, and
explains why Data Mining is better accepted in Industry.
1. Introduction
Many techniques for developing models out of data were developed since the 60s. This work
amounts to building automatic method for performing an inductive reasoning, but it is not always
acknowledged to be of this nature. Since Data Mining (DM) is the last manifestation of this
attitude, we shall briefly recall the various domains which participated in this effort, in order to
obtain a definition of what DM might be.
Machine Learning was developed at the end of the 70s while Data Mining started at the
beginning of the 90s. In parallel, and since the 60s, several techniques that all belong to Statistical
Learning, have developed as well as their applications to Pattern Recognition. Statistical
Learning includes the last improvements to regression, in particular regression trees (Breiman et
al., 1984), the domain called Data Analysis, the perceptron (Rosenblatt, 1958) and its extension,
neural networks (around 1985, see Le Cun et al., 1989), and Support Vector Machines (Vapnik,
1995). Independently, Bayesian statistics developed their inductive tools. The so-called “naive
Bayes” technique has been used since the beginning of the 60s (Maron, 1961). It postulates
conditional independence between the features knowing the class variable. Presently, techniques
for the automatic generation of Bayesian networks, including the structure of the network, have
been developed.
I propose to call Automated Learning (AL) - a domain still in creation - that unifies ML and
Statistical Learning (including Data Analysis, Pattern Recognition , Neural Network and
Bayesian approaches). This leads us to propose the following definition:
Definition:
From the point of view its origins as well as from the one of daily work, Data Mining is the
merging of Data Base and Automated Learning research.
2. This shows clearly that, in spite of the still strong influence of Carnap's ideas1 (1959) in Science,
researchers in inductive reasoning have not tried to extend the capacities of models of uncertainty
(this work has been done by researchers specialized in the creation of deductive reasoning
models) but to improve our ways to deal with the phenomenon of model emergence from data.
Bayesian networks illustrate the ambiguousness of this phenomenon particularly well. Some
researchers (specialized in deduction) try to improve the capacities of Bayesian networks
inference, given a structure and the conditional probabilities. They improve capacities of
reasoning of the given model, and it happens that this model is capable of deductive and
abductive probabilistic reasoning. Inversely, some other researchers (specialized in induction)
develop methods for the construction from data of the tables of conditional probabilities and of
the structure of the Bayesian network. The last ones try to improve the adequacy between data
and the network, whereas the first try to improve the capacities of a given network.
Because of the relations that we have just underlined between DM and AL, it comes somewhat as
a surprise that Industry enthusiastically adopted the first, while it has always looked down on the
second. Even more surprising, our the analysis forthcoming in this paper will reveal that the deep
reason of DM success seems to be that it did not hesitate to innovate relative to traditional data
processing whereas AL preserves the majority of its epistemological choices.
In reality, and because of this industrial success, the relationships between DM and AL already
underlined, and much of the software sold as DM is nothing but friendly interfaced AL systems.
In this paper, without insisting more on the camouflage that we have just underlined, we will
point at the most important differences between DM and AL, those that can explain the “fashion
effect” of DM.
2. The components of DM
Before being able to describe the differences between the two domains, we have to recall what
these domains are made of. The review below presents the most widespread methods developed
by each component of DM. Each method will be described by its essential aspect, inputs and
outputs of each system, but without going into detail. In spite of our lack of exhaustiveness, the
wealth of methods - often unexpected to the non specialist – worked out in order to help humans
to build models from data is quite striking.
In order to explain the difference between DM and AL, it is also necessary to separate Supervised
Learning, in which the inductive steps are controlled by the expert before the inductive phase,
from Unsupervised Learning where the expert's opinion is taken in account after the model has
been built automatically.
2.1 Supervised and Unsupervised Learning
2.1.1. Supervised Learning
1
He states: « all inductive reasoning, ..., is reasoning in terms of probability; hence inductive logic, the theory of
inductive reasoning, is the same as probability logic ... ».
3. Supervised Learning essentially consists in the transformation of a description in extension of a
class, to a description made in intention of the same class.
Inputs are in a data table, one field of which is called the class, or the variable of interest. The
other fields are called features. All the fields can be continuous or discrete.
Outputs are uncertain theorems whose premise is a combination of the feature values, and the
conclusion is one of the class values.
This is an improvement on the obvious condition that the description in intention uses less many
bits than the description in extension, and this is a means to rate the interest of a description in
intention.
The validity measure of such a procedure is most often a so-called "cross-validation," i.e., data
are repetitively divided in a learning set of and a test set, upon which the precision is measured.
In general, 9/10 of the initial set are used for learning, and 1/10 for the test. This procedure is
repeated 10 times and the precision is the average of the precision obtained for each test. The
value of 10 does not have a theoretical justification, but seems to give quite satisfactory results.
2.1.2. Unsupervised Learning
Unsupervised Learning tries to extract structures (or patterns) existing within the data, without
knowing beforehand what is a ‘good’ structure.
Let us first speak of Data Analysis that developed fundamentally deductive methods but that are
used often in an inductive way, as correspondence analysis and main components analysis.
Generally, when a matrix is made diagonal and that the ‘strongest’ values are kept while the
‘weakest’ ones are ignored, then an inductive use of a deductive method is performed. In fact, the
induction is made by the human who decides what is strong and what is weak. In principle, it
would be enough to add an optimization operation for the system to become perfectly inductive.
It happens that this addition is far from being easy, this is why so many directly inductive
methods have been developed.
Depending on the kind of structure looked-for, Unsupervised Learning takes a particular name.
When the system must build classes clustering the individuals judged as the most similar relative
to a certain criteria, then it is most often called clustering, and classification in Data Analysis,
categorization in Cognitive Sciences, segmentation in the industry.
When the system looks for logical relations confirmed by data, that is to say theorems, in general
uncertain ones, then it is referred to as the detection of associations, or relations or patterns within
the data.
When a valid functional relation among the variables is looked for, Statistics talks about logistical
regression and in ML it is ‘scientific discovery'. The main scientific laws, such as the law of gas
compression, PV = nRT, express a functional relation holding among data.
When the searched relations are relative to the spatial or temporal organization, one speaks of the
discovery of spatial sequences (typically: in Genomics) or of temporal sequences (typically: in
the analysis of the stock market).
It is necessary to realize that Unsupervised Learning does not start with enough information to
steer the induction steps towards a solution more or less expected by the user. Therefore, its
results are extremely difficult to validate. In fact, these results are of three kinds: they can be
trivial (for example, the systematic discovery of tautologies) when they are relative to a very
large population; false (due to noise, for example) when they are relative to a tiny population; or
very interesting since they are unexpected.
4. The results of Unsupervised Learning can be validated always a posteriori in two ways.
The first consists in a direct confirmation by a domain expert. Like any other scientific
discovery, validation takes place when the discovery raises interest among the experts and brings
progress to a domain. For example, a system of automatic association detection can be coupled to
an Expert System, and Unsupervised Learning is a success when the induced rules, once
introduced into it, improve the Expert System.
The second is a kind of cross validation obtained by several independent optimizations. Its
principle is as follows: use an optimization method, as in 2.2.c below, to perform the
Unsupervised Learning, then test the obtained results with a supervised method using another
optimization criterion. For instance, our team is developing a system that detects associations,
while using a measure called Non-contradiction, combining the confidence in the validity of the
implication A ⇒ B, P(B A), and the confidence in the non validity of this implication, P(¬B
A). Each rule thus found defines two classes in the examples, those that follow the rule and those
that do not. This creates a clustering relative to the set of found rules, provided we accept that
these classes cover the examples without partitioning them. These classes are considered, in turn,
as data by a supervised induction method, here a decision tree, optimized according to a measure
of entropy. The two types of rules thus created should be equivalent, and they are compared. Our
experience is that rules found by the two methods are very different, but their comparison is
easier to rate for an expert than the rules obtained in an unsupervised way.
2.2 The induction criteria
Almost all programs achieving an inductive step perform an optimized search in a space of
hypotheses. Inductive Learning consists in the following 4 steps.
2.2.1. Definition of the hypothesis space
A few starting examples are chosen, and a space of hypotheses is generated as a subset of the set
of all possible generalizations of these examples. To learn grammatical tagging, i.e., labeling
each word of a text by its grammatical category, for example, one particular tagging is observed,
usually in a very large set of tagged sentences, and all the generalizations describing the context
of this tagging are generated. The system learns then the generalizations that are the most
confirmed in the tagged text. In general, this very important step is described very briefly or even
poorly by the authors: they add in a mixture of domain knowledge, of arbitrary choices of
knowledge representation, and hidden heuristics. A precise definition of the hypothesis space is
indeed difficult to describe correctly. For example, Brill's tagger (1994) learns tags in context,
and it describes the context of a word by the labels or the words preceding or (exclusive or)
following it within a distance of three words. This defines a limited space of possible
generalizations, and the reason why generalizations including words or labels preceding and/or
following the one to be tagged does not correspond to a theory about the environment of a word.
Its role is simply to limit the size of the research space. One contribution of DM is to have
insisted on the importance of this step, which must be explicit so that one can understand that the
results can only be a combination of allowed generalizations. For example, association detection
in DM is done under conditions of coverage and precision that have a questionable interest, but
that are perfectly explicit.
5. 2.2.2. Choice of a search strategy within the hypothesis space
The most current strategies are the so-called greedy and exhaustive strategies.
Brill's tagger, cited above, uses an exhaustive search in a very limited hypothesis space.
DM, in association detection, uses also an exhaustive research.
In the greedy strategy, the possible choices are ranked according to a measure of
optimization (to see point c. below) and the path passing by the first point optimizing this
measure is chosen.
The ML approach put a lot of efforts in studying these search strategies, whereas other
approaches tend to adopt the exhaustive search.
Random choices, a variant of the exhaustive strategy, seems very efficient.
Genetic Algorithms are also acknowledged as one of the most efficient search strategies.
2.2.3. Choice of an optimization criterion
The number of optimization criteria is impressive, consequently we will discuss them in detail.
The two most often used criteria are precision (number of successes / total number of tries) and
recall (number of successes / number of objects to be recognized). In Supervised Learning the
number of successes is given by the number of cases where the class is correctly recognized by
the hypothesis under test. In Unsupervised Learning, precision is an evaluation given by the
expert examining a subset of the obtained results. Usually, the expert examines only a subset
because, if the automatic method is efficient, then it deals with too much data and too many
results to be entirely checked by a human. Note then that in Unsupervised Learning the number
of objects to recognize is unknown. Therefore, recall is not computable, unless the expert makes
an exhaustive analysis, and we have just underlined that this is unrealistic on real problems.
It is also “well known” (at least in the ML community) that the precision measure expresses a
particular hypothesis on the nature of data and that Laplace estimator, (number of success +1) /
(total number of tests + number of classes to be recognized) is to be preferred (see
http://www.lri.fr/~yk/ for explanations relative to this phenomenon). It is also interesting to
consider the number of times where the class is falsely recognized (the so-called “false positive”
recognition), that is to say that the hypothesis under test is mistaken while recognizing a class.
The ROC curves (Receiver (or Relative) Operating Characteristic), used especially in DM,
represent the variation of the correctly recognized against the falsely recognized classes. The
precision is also used in DM by drawing lift charts giving the variation of the precision
according to the number of examples examined. A good lift-chart rises very fast which is very
important in the unsupervised approach since a high precision is reached with a small number of
examples validated by the expert, and this is worth consideration since expert work is always
expensive.
Another classical criterion is entropy variation, systematically used by decision trees, or the
quadratic entropy (also called Gini index) used in ML and in Data Analysis.
When a numerical distance between objects is computable, and this is an usual hypothesis in Data
Analysis and in regression techniques, multiple transformations of the data representation are
then possible, based, in general, on a minimization of the squares of a distance.
The statistical approach very often uses the hypothesis that a distribution of small variance is
better than another of large variance, and it uses the minimization of the variance as a criterion
for optimization, for instance in the case of regression trees.
6. The Bayesian approach uses the fact that data tables give the probability of the data knowing that
the studied phenomenon, Ph, took place, P(D Ph). In Supervised Learning Ph is, for example, to
belong to a class, and in the unsupervised case, it can be the validity of a pattern. One can
therefore deduce the probability of the phenomenon given the data by computing P(Ph D) =
P(D Ph) * P(Ph) / P(D). This process uses the least possible induction, it simply induces that the
values of P(Ph D) computed from observed data stay valid for new data.
Finally, it is also classical to use the principle of Minimum Description Length (MDL). For this,
both the length of the description of the model, and the length of the description of the examples
it fails to class correctly are encoded (in the supervised case). According to this principle, the
minimum of the sum of these two values is an optimum. The software C4.5 transforms the trees
into rules according to this principle. The present methods of Bayesian networks construction
from data also use the MDL principle systematically. In this unsupervised case, the encoding
includes the network and the examples, given this network.
DM also introduced other measures of optimization, more linked to applications, such as
the optimization of operation cost, or the return on investment, etc.
2.2.4. validation
AL was in general satisfied with validations associated to the chosen optimization criteria. As the
criterion of precision is the most often used, validation reduces to show that the most precise
hypotheses have been used, as in the above described cross-validation.
DM insisted on the importance of a further phase of validation. Either the induced results are
directly examined by an expert who confirms their validity (the comprehensibility of results is
then a primary condition), or, this is the best validation, the results of the induction are used for a
task whose efficiency is measurable. Validation takes then place when efficiency is increased
with the introduction of the induced knowledge.
2.3 Data Mining
One can consider that the date of birth of DM is 1989 when Gregory Piatetsky-Shapiro organized
the first workshop on " Knowledge Discovery in Data Bases". However, the first spectacular
demonstration dates from 1995 when he organized the first KDD conference in Montreal.
Among multiple applications and original points of views, DM gave birth to three main types of
methods that are all included in the DM commercial systems.
The first is association detection, in particular the discovery of uncertain theorem confirmed by
the data, and the multiple measures of interest to choose among all valid theorems. The DM
approach focuses on the problems raised by applications to very large data bases.
It happens that these methods can be very easily extended to the discovery of temporal series that
became the second noticeable successes of DM, as scientific discipline.
The default of classical methods of association detection, that is to say their exhaustiveness
limited by the cover only (if, for example, A & B ⇒ C, then the cover of this implication is the
probability that A, B and C be together true), becomes an advantage when discovering temporal
series since they can be considered as valid only when the series is repeated often enough.
Finally, and under industrial influence, DM developed multiple methods for data cleaning and
segmentation.
7. 2.4 Machine Learning (ML)
The first programs developed that learn rules from data are due to Michalski (Michalski and
Chilausky, 1980) and this dates the beginning of ML, although the first ML workshop (that
became the International Machine Learning Conference) took place in 1982.
The work of Dietterich and Michalski (1982) witnesses that learning structures was a very early
concern for ML.
This research field accomplished most of its work in Supervised Learning and generated a
quantity of systems of which some are included in industrial software.
In particular, decision trees ask for an input of discrete or continuous features (that will be made
optimally discrete in regard to the classes) and of imperatively discrete classes. They produce
classification trees that are a description in intention of the classes. The most famous of these
systems, C4.5 (sold now as C5 or See5) generates rules built from the decision tree.
Other systems, such AQ and CN2, generate classification rules directly from the data, generally
discrete or previously discretized ones.
One of basic procedure of Learning is generalization. The space of possible generalization has
been called the version space, and many methods propose their own way to move in the version
space.
Inductive Logical Programming (ILP) is precisely one way to move in a relational version space.
All other methods suppose implicitly that a feature is in relation with only one record, i.e.,
features are postulated to be unary. Otherwise stated, the i-th feature takes a value for the j-th
field. In ILP, a feature can be n-ary, i.e., it describes a relation between n objects. For example,
one can describe the properties of objects A and B with features taking unary values (such as : A
is red, B is blue), or a binary feature, such as the distance between A and B (for instance,
distance(A, B) = 27). From inputs of this type, ILP will learn some general laws about the
distance, for example that there are no objects distant from B of more than 50 units: [For all x,
(distance(x, B)) <50]. However, the space of possible hypotheses becomes huge, and the
algorithms checking the validity of the hypothesized relations are n-complete. It follows that the
descriptive power of ILP is balanced by the complexity of the computation necessary to verify
the hypotheses allowing the program to build a model explaining the data.
This is why the domain seems to move now towards the so-called propositionnalisation methods
in which n-ary descriptions are trivially replaced by unary relations: one creates, in principle, as
many descriptions as there are possible variable matching. The combinatory explosion in time is
replaced by a combinatory explosion in space. The gain comes from the fact that only a few (that
is, thousands of them) “carefully chosen” descriptions are preserved. The heuristics defining the
way to choose the descriptions to keep (including the trivial heuristic of random choices)
constitute the main topic of research for this new approach.
In clustering, the main contribution of ML is the Unsupervised Learning COBWEB system.
COBWEB uses yet another criterion of optimization, called utility. The utility of a class C
containing the feature A taking v possible values is computed by the product of the probabilities
P(A = v) P(A = v | C) P(C | A = v). P(A = v) is the probability that feature A takes value v; P(A =
v | C) is the probability that the feature A takes the value v in class C; P(C | A = v) is the
probability of meeting the concept C when A = v. Of course, Bayes law rewrites this expression,
8. to be able to compute the sum of utility gains brought by each class, so that the formula giving
the utility of a clustering is:
U =∑P(C) [∑∑P(A = v | C)2 - P(A = v )2 ] /n
where n is the number of classes, where the first sum is on all classes, and the two following ones
are on all features and on all their values. U is computed for every possible configurations, which
would be impossible if one did not compute the utility gain incrementally. COBWEB is therefore
very slow, but incremental so that it is very well adapted to problems asking for a regular
updating. Besides, the sums are replaced by integrals when dealing with continuous values, so
that COBWEB adapts well to mixed, continuous and discrete, data.
In spite of all these qualities, COBWEB, still written in LISP, is not part of a commercial
software.
2.5 Pattern Recognition
Before ML started, researchers in Pattern Recognition developed learning programs of which the
most used is a linear separator, called the perceptron (Rosenblatt, 1958). One can prove that a
perceptron is able to separate two sets of examples indexed by 0 and 1 in a finite number of k
steps of calculation, where k is bounded by Novikoff’s important theorem, k < (R/ γ ) 2. R is the
radius of the data (that is to say the radius of the volume they fill in the space of n features), and γ
is the maximum, on all examples, of the minimum, on all hyperplans, of the distribution of
distances between the examples and the separating hyperplan, what is now called the functional
margin of the separating hyperplan.
Neural Networks (NN) were born from the need to get out of linear separators, but their success
is rather due to the fact that they deal with inputs and outputs, possibly multiple outputs, that can
be continuous, discrete, or mixed. These two properties (mixed variables and multiple outputs),
inherent to the way a NN is built, correspond to a real industrial need. The NN are now used in
the settings of Vapnik's theory, that is to say as support vector machines (SVM) in order to be
able to compute their generalization capacity.
NN led to an unsupervised version, self-organizing maps (of Kohonen, 1990). Kohonen's maps
implement a particular kind of NN, the so-called competition NN. The success of an output
neuron (belonging to what is in this context called the competition layer) to recognize an input,
reinforce the neuron winning the competition and inhibits the other neurons, so that the winner
for an example, has a tendency to specialize in the recognition of this example.
A self-organizing map is a NN whose outputs are equal in number to the number of classes. Two
examples belong to the same class if they activate the same output. Outputs are represented as
disposed in a plan as the nodes of a grid, which is where the name “maps” comes from.
2.6 Exploratory Statistics
Statistics are extensively taught in University curricula, but their exploratory aspect is
much less taught, we will therefore give a few details on this aspect. The hypothesis underlying
9. all inductive statistics, in spite of the diversity of the proposed methods, is that the smaller the
variance, the better the model.
For example, the k-means method minimizes intra-class variance, so that if N is the
number of objects to classify, xi the coordinates of the i-th object, and μm the coordinates of the
center of gravity of the m-th class, then the quantity to minimize is
1/N ∑m ∑i (xi - μm)2
The difference between the k-means and other approaches, comes from the various methods of
choice of the seed (i.e., choose astutely the first μm), and the subsequent technique of allocation-
recentering (i. e., compute astutely the next μm).
Regression, be it logistical or not, looks for a solution that minimizes the variance of a
distance, most usually given by the sum of the squares of distances of the objects to the solution.
When the model to be discovered is not given in advance, then the way logistical regression
discovers the model is a truly inductive work.
Regression Trees (Breiman et al., 1984) use exactly the same technique, except that
beforehand it divides the space of solutions in pavements, each among them being a leaf of the
regression tree. Thus, the building of the regression tree itself brings no new concept to the
foreground. Inversely, the notion of an optimal path for pruning the tree built in this way,
introduced by Breiman, is indeed a new concept added to Exploratory Statistics.
Finally, support vector machines (SVM, Vapnik, 1995), in their simplest linear form, are
nothing but perceptrons that minimize the variance of the distances between the objects and the
separating hyperplan, which is called the minimization of the functional margin. The notion of
kernel permitting to simulate the non linear separations, and the notion of Vapnik-Chervonenkis
dimension are, on the contrary, completely original. By these aspects, SVM introduce exploratory
statistics of an completely new type.
2.7 Data Analysis
Data Analysis (DA) is taught very extensively in university courses, for this reason we will not
give any details on this approach.
The basic method of DA - clustering excepted- consists in studying the points in Rn formed by
the studied object. After centering (i.e., expressing coordinates as distances to the mean) and
reducing (i.e., dividing by the standard deviation), a family of ellipsoids centered on the mean is
studied, and the one closest (i.e., most often, the one minimizing variance) to the largest number
of objects is deemed the best representation of the data. The axes of this best ellipsoid reflect the
main tendency of the data. As we pointed out above, induction takes place by choosing the
‘relevant’ number of axes of the ellipsoid.
DA also developed methods of Unsupervised Learning of classes while regrouping individuals
nearest in the sense of a numerical distance.
2.8 Bayesian statistics
The main effort of Bayesian statistics is relative to the development of deductive reasoning
methods taking into account the conditional independence of discrete variables. From the point of
view of induction, they developed two techniques.
10. The first one is a Supervised Learning method called "Naive Bayes" where all features
conditionally depend on the class to be recognized, if this class is known. Learning, in this case,
is reduced to taking into account the probabilities of the observed event occurrence, but it is one
of the most efficient methods in precision, and it can deal with many features. Note however that
the generated model is absolutely incomprehensible.
The second one is unsupervised. Two different things can be learned. For a given network
structure, it is possible to learn the conditional probability tables from data. The
comprehensibility is then entirely due to the network. It is also possible to learn the structures
themselves. In this case, the automatic generation of large Bayesian networks (Heckerman et al.,
1995) constitutes an essential progress in the domain of inductive reasoning. The criterion of
optimization used is MDL, the principle of minimal description length. This approach induces
comprehensible structures from examples. However, recent results (Bendou and Munteanu, 2003)
devised experiments showing that a very small amount of noise, of the order of 1%, will change
many structures of the network. They also proved the generality of their experimental results by
using the properties of d–separation. The V-substructures only, expressing a conditional
dependence of two nodes relative to a variation of knowledge about a third node or its
descendants (in other words: two variables are the common ‘cause’ of third one), resist well to
noise and might possibly be considered as explanatory by the domain expert. The other structures
are not steady, and get settled to the only purpose of optimizing the network behavior in
precision.
This approach has also produced a classification method, AUTOCLASS, that builds classes using
an exhaustive search of classes conditionally optimal relative to data, or at least in principle an
exhaustive one. To our knowledge, this approach has not given any industrial software, even
though an American company tried to sell it.
3. DM/AL differences from the point of view of epistemology
These differences are summarized below in table 1, showing that DM and AL, though both
automate the generation of a model from data, differ otherwise in many epistemological choices.
Differences in the scientific
approach
Classic data processing Automatic Learning DM
(ML and Statistics)
Simulates a deductive Simulates an inductive Simulates an inductive
reasoning (= applies an reasoning (= invents a model) reasoning ("even more
existing model) inductive")
validation according to validation according to validation according to
precision precision utility and comprehensibility
Results as universal as possible Results as universal as Results relative to particular
possible cases
elegance = conciseness elegance = conciseness elegance = adequacy to the
11. user's model
Position relative to Artificial Intelligence
Tends to reject AI Either tends to reject AI Naturally integrates AI, DB,
(Statistics) or claims Stat., and MMI.
belonging to AI (ML)
Table 1: Differences of epistemological nature among Computer Science, AL and DM.
3.1 Induction
Classic Computer Science applies existing models, and as we already pointed out, these models
can be of a probabilistic nature. In the same way, methods of fuzzy inference propose a model,
the fuzzy model, and study how this model can be applied to real data. Some approaches produce
inductively fuzzy models, as fuzzy trees of decision (see http://www.lri.fr/~yk/ for a particularly
simple presentation of fuzzy decision trees) or fuzzy rules. This addition of fuzziness makes the
induction more complex (and requires fuzzy data) but does not modify its nature. In the same
way, Rough Sets are a knowledge representation and propose a model. They are therefore by
nature deductive. This does not prevent them fro introducing induction within their
representation, but the induction methods then introduced are the same as those of the other
inductive approaches.
AL obviously works on the automatic generation of models, but while the majority of the systems
stemming from AL perform Supervised Learning, the majority of systems stemming from DM
perform Unsupervised Learning. This is why table 1, above, states that DM is “even more
inductive” than AL.
3.2 Validation
In classical Computer Science, because of the weight of the deductive approach, a result is
definitely validated after having been integrated into a formal model, so that it seems deducible
from this model. Here, we will not deal with this final phase, but only with the initial phase
during which the first experimental results are obtained. AL, as well as classical data processing,
uses a criterion of precision to choose the most meaningful experimental results. In fact, symbolic
Learning has sometimes also introduced criteria of comprehensibility. For example, the induction
of decision trees software, C4.5, introduces a final procedure during which decision trees are
transformed into rules, often more comprehensible than trees. Besides, the creation of short trees
or short rules is preferred, even to the loss of a little amount of precision, in order to favor
comprehensibility. The concern for comprehensibility therefore did not appear ex nihilo in DM. It
is necessary to admit, however, that most research efforts, even in the field of symbolic ML, have
been judged on criteria of precision rather than on comprehensibility.
DM considers that precision is only one of the possible criteria, and substitutes the concept of
utility. Utility is obviously not universal and therefore DM introduces at this point a definition of
validation depending on each problem, what is both very new, and very interesting for each
application. Some criteria of utility, as the patient’s pain in Medicine, depend closely on the
application and are completely incompatible with precision. DM therefore does not hesitate to
12. introduce some social considerations in the criteria for algorithm validation, which is classically
considered as a "scientific heresy." Comprehensibility is also a criterion of social nature, and
what means more precisely : express the induced model in the language of the concerned field,
while using this expert's concepts.
In fact, DM supposes that a society of experts exists, and that it shares the same concepts and
speaks the same language (which is quite sensible), and DM addresses explicitly to one of these
societies, in each of its applications. Validation happens within this society of experts and not in
an absolute sense.
3.3 Universality
In fact, choosing utility, as opposed to precision, as a criterion of optimization, is already an
example of choice of the particular versus the universal. AL is essentially about the general
methods of induction and their properties. Inversely, DM is essentially about the application of
induction methods to particular problems. For example, AL considers that data are not spoiled by
unverifiable mistakes that prevent the induction to take place correctly, whereas DM considers
that each data set requires a particular cleaning treatment.
At the other end of the chain of knowledge acquisition, AL considers its work accomplished once
knowledge that satisfies a given criterion is acquired. DM considers that this knowledge must be
useful in the relevant specialty domain, and it must be validated by an improvement of the
existing methods of this specialty domain. In addition, it is quite characteristic that the DM
conferences, even the academic ones, systematically organize competitions among systems, and
that domain experts are called to judge the excellence of the results obtained. In a similar way,
Text Mining, methods are adapted to a particular corpus whereas the more classical Linguistics
approach analyzes the general laws of the language.
This difference might appear trivial but it is fundamental. It is quite obvious that it is impossible
to rewrite all programs for each application. This is why DM develops tools allowing experts
themselves to develop their application, for every particular case. This requirement forces
conviviality in setting the program parameters, and that leads to methods adapting to different
applications.
Thus, by a kind of epistemological slight of the hand, DM, which is less interested in the general,
builds systems that have more potential applications (and in a sense they are therefore more
general) that AL.
3.4 Elegant conciseness
There have been many debates about the criterion called "Occam's razor", that prefer the simplest
solution. It remains the rule for most approaches (in the DM community, see a discussion in
Domingos, 1998). Of course, nothing really scientific justifies it, except the scientist's aesthetic
pleasure when they use it. This systematic conciseness, when it results in a lack of clarity in the
exposition of the model induced, opposes to the principle of comprehensibility of DM.
3.5 Relations with Artificial Intelligence
It is relatively surprising to note that DM integrates perfectly, apparently without problem, AI
with approaches that traditionally rejected AI. Of the two AL components , the symbolic
component declared its belonging to AI, whereas Statistics, and even Pattern Recognition, put
13. distance between AI and them. It is possible that the academic quarrels pro or con AI do not
really concern the industrial world, and that this integration of AI in DM is not a reason for
industrial acceptance, but a consequence of an industrial concern.
4. An industry view of the differences DM/AL
4.1 The twelve tips for successful Data Mining, according to the Oracle Data Mining
Suite
These tips can still be found on the web, in .pdf form, at:
http://technet.oracle.com/products/datamining/listing.htm
We use these tips as interesting witnesses of what an industrial might ask from a DM method. We
shall see that under their humorous formulation, very interesting truth are hidden.
4.1.1 - Mine significantly more data.
AL has a tendency to look deeply into small databases, whereas the DM concentrates its efforts
on the very large ones.
4.1.2 - Create new variable to tease more information out of your data
AL, and specially ML developed methods called “constructive induction” and “feature selection”
(Liu and Motoda, 1998), that is to say, ways to create or eliminate features. However, this effort
was essentially carried out on the justification of modifications done to the features, while DM is
ready to be content with a posteriori justifications, observed by the improvement of the obtained
model, rather than by carrying out transforms justified beforehand.
4.1.3 - Take a shallow dive into the data first
A superficial approach is never advisable in an academic context. However many crude mistakes
are avoided by a superficial examination.
4.1.4 - Rapidly build many exploratory predictive models
AL tries to build the ‘best’ optimal explanatory model, whereas DM does not hesitate to produce
several explanatory models. Even in the case of new techniques (actually born after DM started
to exist) such as boosting and bagging, the main effort consists in devising a kind of voting
procedure providing one best result, usually the most precise one. The DM approach would be to
keep the different models generated and help the domain expert to choose among them, or to
combine them in an optimal way.
4.1.5 - Cluster your customers first, and then build multiple targeted predictive models.
As we saw already, in AL, supervised approaches are distinctly dominant, while the unsupervised
ones lead DM. We also saw that one of the goals of Unsupervised Learning is clustering,
14. therefore a segmentation of records of the DB. Once this segmentation is done, methods of rule
generation, for example, can be applied to each segment.
This advice may appear innocent and somewhat superficial. Yet, it is very important. While
applying pattern detection methods to the entire basis, general laws, valid for all individuals, are
sought, and this often leads to detecting only trivial laws, valid for all the records. Inversely, a
prior segmentation allows us to detect patterns valid on some sub populations. If these sub
populations are meaningful, that is to say if the segmentation has a sense, then the laws thus
found have a good chance of being interesting, either unknown or merely suspected by the expert.
We see that this advice is an illustration of the difference about universality, commented above in
3.3.
4.1.6 - automated model building
This advises the use of induction, it does not make any difference between AL of DM. It
nevertheless illustrates that automatic building of models, i.e. the automation of inductive
reasoning, is not a fancy of academics but an industrial need.
4.1.7 - Demystify neural networks and clusters by reverse engineering them using C&RT
models
Neural Networks techniques of classification, together with many other approaches, could be
"demystified" since they are not the only ones to provide non comprehensible results. DM does
not recommend the exclusive use techniques giving comprehensible results, and all techniques of
data mining are acceptable. It is however DM-unacceptable to provide crude outputs, without
interpreting them in a language comprehensible to the user. It follows that the concept of reverse
engineering should become central in DM.
4.1.8 - Use predictive modeling to impute missing values
The missing value problem is obviously well-known in AL. The methods used in AL are of three
types.
The data are absent in a natural way (for example, the illnesses specific to one sex will be
missing from records of the other sex). Then, the missing values are replaced by "non
meaningful" and a specific non-meaningful-value treatment is introduced in the algorithm. This
solution is definitely the best in this case.
When the missing data are due to a lack of documentation, then two solutions are used. The first
one consists in introducing a coefficient weakening the variable whose data are missing, as in
C4.5, in order to decrease their contribution to the decision. The second one consists in
completing by the mean of the observed values. The mean cab be taken over the whole set of
examples, or over the examples of the same class.
The DM approach to this second case follows from the fact that DM does not suppose that the
learning takes place in one step. The domain specialist and the programmer work together to
optimize the results. Models created during the previous iteration, or existing models known to
the experts, are used to compute the missing values.
It is necessary to note however that the case of large amounts of missing data is not dealt with.
When, for example, more than 80% of the values of a variable are not documented, there is no
really efficient method to deal with such shortcomings.
15. 4.1.9 - Build multiple models and form a ‘panel of experts’ predictive models
AL developed numerous approaches for simultaneously generating several models, in particular
those including a vote of models. Eventually one of the models will win. The notion of
cooperation between experts is never used. Although this has not been studied much, models of
agents could play an important role in DM.
4.1.10 - Forget about traditional dated hygiene practices
I prefer not to comment this assertion.
4.1.11 - Enrich your data with external data
AL, in principle, takes data as it is given. It are not obtained by a process with which interaction
is possible. DM supposes that observing that some necessary new data is possible. It can solve a
problem or obtain a solution otherwise impossible to find.
4.1.12 - Feed the models a better ‘balanced fuel mixture’ of data
This advice is similar enough to the one before, except that the model obtained at the previous
iteration is also used to search for data that is better adapted to a future induction.
4.2 What Data Mining techniques do you use regularly?
When consulting Gregory Piatetsky-Shapiro's site, http://www.kdnuggets.com, it is noticeable
that the tools really used in DM are not exactly those that had the greatest success among the AL
community. In particular, categorization tools are used as much as the entire set of the statistical
tools (not including regression and nearest neighbors). Moreover, when one considers
categorization no longer as a tool, but as a problem, 22% declare a need for these tools.
Aug. 2001 Oct. 2002
Clustering - 12% (if ‘type of analysis’, then 22%)
Neural Networks 13% 9%
Decision Trees/Rules 19% 16%
Logistic Regression 14% 9%
Statistics 17% 12%
Bayesian nets 6% 3%
Visualization 8% 6%
Nearest Neighbor - 5%
Association Rules 7% 8%
Hybrid methods 4% 3%
Text Mining 2% 4%
Sequence Analysis - 3%
Genetic Algorithms - 3%
Naive Bayes - 2%
Web mining 5% 2%
Agents 1% -
16. Other 4% 3%
Table 2. The DM tools in 2001 and 2002.
New methods have been adopted during the last year, such as sequence analysis, genetic
algorithms, text and web mining, that constitutes 12% of new methods. A sudden appearance of
5% of such a nearly ancient method as Nearest Neighbors is all the more striking. In fact, it is
extremely simple to implement, and its efficiency in precision has been noticed for years in the
academic world. Nevertheless, no real clever changes can be made in its use, thus it is not
interesting to academics.
While taking into account these figures, a decrease of 17% for the techniques classed in 2001 is
to be expected. The slight increase of association detection it is even more noticeable. This
method of automatic detection of uncertain patterns in data certainly answers an industrial need.
To the best of my knowledge, it was never studied by AL before DM started identifying its
interest.
Bayesian networks lose some points, but apparently only because of the difference now made
between naive or not Bayesian. Similarly, the category "statistics" lose 5% which are probably
the 5% of the Nearest Neighbors. Decision Trees decrease slightly, but not significantly.
Finally, one can say that the 2002 losers are
- Logistical Regression, very much taught at University, and therefore probably over-
valued by students gone to work in industry
- Neural Networks, probably because of the complete lack of understandability of their
results, and their tendency to learn procedures that are not general enough.
- Support Vector Machines, not even cited by industry, in spite of their huge academic
success. It will be interesting to check if this tendency is confirmed or not in the coming years.
5. Conclusion
The cause of the industrial acceptance of DM is easy to understand since the creators of
this research topic took the problems of industry into account while AL researchers are centered
on scientific issues. Even though they are certainly happy when they find an application, but they
are not motivated by the application. As a testimony of the isolation of AL research from
industrial applications, consider the thousands of academic AL papers that report the progress of
a few tenths % in precision, improving an already known method, and applied to non grounded
data.
An unexpected consequence of taking applications into account is that DM dares to attack
problems known for being impossible to solve with certainty, that is to say, all unsupervised
problems: categorization and segmentation, discovery of associations, temporal series and
construction of a Bayesian network structure from data. Even in the supervised case, DM also
deals with badly defined problems: large quantity of missing values, very noisy data, data with
few examples (i. e., few records) and a large number of features (i.e., many fields). A striking
example of this last problem, which currently attracts much attention from the DM community, is
DNA chips. It is obvious that many models will fit this special kind of data. It is therefore
hopeless to try to find the one true solution. The real goal is decreasing the failure rate in order to
ease further the work of the human specialists.
17. Thus, DM is characterized by its audacity in challenging the problems as they are, not as they can
be neatly solved.
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