This document discusses knowledge discovery and data mining. It defines knowledge discovery as the process of automatically searching large volumes of data for patterns that can be considered knowledge. Data mining is defined as one step in the knowledge discovery process and involves using computational methods to discover patterns in large datasets. The document outlines common data mining tasks such as predictive tasks, descriptive tasks, and anomaly detection. It also discusses evaluating data mining algorithms, including assessing the performance of a single algorithm and comparing the performance of multiple algorithms.
Knowledge Discovery Tutorial By Claudia d'Amato and Laura Hollnik at the Summer School on Ontology Engineering and the Semantic Web in Bertinoro, Italy (SSSW2015)
Data mining involves finding hidden patterns in large datasets. It differs from traditional data access in that the query may be unclear, the data has been preprocessed, and the output is an analysis rather than a data subset. Data mining algorithms attempt to fit models to the data by examining attributes, criteria for preference of one model over others, and search techniques. Common data mining tasks include classification, regression, clustering, association rule learning, and prediction.
A lot of people talk about Data Mining, Machine Learning and Big Data. It clearly must be important, right?
A lot of people are also trying to sell you snake oil - sometimes half-arsed and overpriced products or solutions promising a world of insight into your customers or users if you handover your data to them. Instead, trying to understanding your own data and what you could do with it, should be the first thing you’d be looking at.
In this talk, we’ll introduce some basic terminology about Data and Text Mining as well as Machine Learning and will have a look at what you can on your own to understand more about your data and discover patterns in your data.
Data mining involves using algorithms to find patterns in large datasets. It is commonly used in market research to perform tasks like classification, prediction, and association rule mining. The document discusses several common data mining techniques like decision trees, naive Bayes classification, and regression trees. It also covers related topics like cross-validation, bagging, and boosting methods used for improving model performance.
This document discusses various machine learning techniques for classification and prediction. It covers decision tree induction, tree pruning, Bayesian classification, Bayesian belief networks, backpropagation, association rule mining, and ensemble methods like bagging and boosting. Classification involves predicting categorical labels while prediction predicts continuous values. Key steps for preparing data include cleaning, transformation, and comparing different methods based on accuracy, speed, robustness, scalability, and interpretability.
Definition of classification
Basic principles of classification
Typical
How Does Classification Works?
Difference between Classification & Prediction.
Machine learning techniques
Decision Trees
k-Nearest Neighbors
Data mining refers to extracting hidden patterns from large databases and is a step in the Knowledge Discovery in Databases (KDD) process. KDD is the broader process of finding knowledge within data and involves data preparation, pattern analysis, and knowledge evaluation. It is needed due to the impracticality of manually analyzing large, complex databases. The KDD process includes understanding goals, data selection, preprocessing, mining, pattern recognition, interpretation, and discovery. Examples of applying KDD include grouping students, predicting enrollments, and assessing student performance.
The document describes the 8 step data mining process:
1) Defining the problem, 2) Collecting data, 3) Preparing data, 4) Pre-processing, 5) Selecting an algorithm and parameters, 6) Training and testing, 7) Iterating models, 8) Evaluating the final model. It discusses issues like defining classification vs estimation problems, selecting appropriate inputs and outputs, and determining when sufficient data has been collected for modeling.
Knowledge Discovery Tutorial By Claudia d'Amato and Laura Hollnik at the Summer School on Ontology Engineering and the Semantic Web in Bertinoro, Italy (SSSW2015)
Data mining involves finding hidden patterns in large datasets. It differs from traditional data access in that the query may be unclear, the data has been preprocessed, and the output is an analysis rather than a data subset. Data mining algorithms attempt to fit models to the data by examining attributes, criteria for preference of one model over others, and search techniques. Common data mining tasks include classification, regression, clustering, association rule learning, and prediction.
A lot of people talk about Data Mining, Machine Learning and Big Data. It clearly must be important, right?
A lot of people are also trying to sell you snake oil - sometimes half-arsed and overpriced products or solutions promising a world of insight into your customers or users if you handover your data to them. Instead, trying to understanding your own data and what you could do with it, should be the first thing you’d be looking at.
In this talk, we’ll introduce some basic terminology about Data and Text Mining as well as Machine Learning and will have a look at what you can on your own to understand more about your data and discover patterns in your data.
Data mining involves using algorithms to find patterns in large datasets. It is commonly used in market research to perform tasks like classification, prediction, and association rule mining. The document discusses several common data mining techniques like decision trees, naive Bayes classification, and regression trees. It also covers related topics like cross-validation, bagging, and boosting methods used for improving model performance.
This document discusses various machine learning techniques for classification and prediction. It covers decision tree induction, tree pruning, Bayesian classification, Bayesian belief networks, backpropagation, association rule mining, and ensemble methods like bagging and boosting. Classification involves predicting categorical labels while prediction predicts continuous values. Key steps for preparing data include cleaning, transformation, and comparing different methods based on accuracy, speed, robustness, scalability, and interpretability.
Definition of classification
Basic principles of classification
Typical
How Does Classification Works?
Difference between Classification & Prediction.
Machine learning techniques
Decision Trees
k-Nearest Neighbors
Data mining refers to extracting hidden patterns from large databases and is a step in the Knowledge Discovery in Databases (KDD) process. KDD is the broader process of finding knowledge within data and involves data preparation, pattern analysis, and knowledge evaluation. It is needed due to the impracticality of manually analyzing large, complex databases. The KDD process includes understanding goals, data selection, preprocessing, mining, pattern recognition, interpretation, and discovery. Examples of applying KDD include grouping students, predicting enrollments, and assessing student performance.
The document describes the 8 step data mining process:
1) Defining the problem, 2) Collecting data, 3) Preparing data, 4) Pre-processing, 5) Selecting an algorithm and parameters, 6) Training and testing, 7) Iterating models, 8) Evaluating the final model. It discusses issues like defining classification vs estimation problems, selecting appropriate inputs and outputs, and determining when sufficient data has been collected for modeling.
The document discusses data preprocessing techniques in data mining. It covers why preprocessing is important due to real-world data often being dirty, incomplete, noisy or inconsistent. The major tasks of preprocessing are described as data cleaning, integration, transformation, reduction and discretization. Specific techniques covered include handling missing data, noisy data, data smoothing methods like binning, regression and clustering. Descriptive data analysis methods like histograms, boxplots and scatter plots are also summarized.
Survey on Various Classification Techniques in Data Miningijsrd.com
Dynamic Classification is an information mining (machine learning) strategy used to anticipate bunch participation for information cases. In this paper, we show the essential arrangement systems. A few significant sorts of arrangement technique including induction, Bayesian networks, k-nearest neighbor classifier, case-based reasoning, genetic algorithm and fuzzy logic techniques. The objective of this review is to give a complete audit of distinctive characterization procedures in information mining.
Data mining involves multiple steps in the knowledge discovery process including data cleaning, integration, selection, transformation, mining, and pattern evaluation. It has various functionalities including descriptive mining to characterize data, predictive mining for inference, and different mining techniques like classification, association analysis, clustering, and outlier analysis.
This document provides an overview of key aspects of data preparation and processing for data mining. It discusses the importance of domain expertise in understanding data. The goals of data preparation are identified as cleaning missing, noisy, and inconsistent data; integrating data from multiple sources; transforming data into appropriate formats; and reducing data through feature selection, sampling, and discretization. Common techniques for each step are outlined at a high level, such as binning, clustering, and regression for handling noisy data. The document emphasizes that data preparation is crucial and can require 70-80% of the effort for effective real-world data mining.
This document discusses various data mining techniques, including artificial neural networks. It provides an overview of the knowledge discovery in databases process and the cross-industry standard process for data mining. It also describes techniques such as classification, clustering, regression, association rules, and neural networks. Specifically, it discusses how neural networks are inspired by biological neural networks and can be used to model complex relationships in data.
The document provides an introduction to data mining and knowledge discovery. It discusses how large amounts of data are extracted and transformed into useful information for applications like market analysis and fraud detection. The key steps in the knowledge discovery process are described as data cleaning, integration, selection, transformation, mining, pattern evaluation, and knowledge presentation. Common data sources, database architectures, and types of coupling between data mining systems and databases are also outlined.
An efficient data preprocessing method for miningKamesh Waran
This document proposes an efficient data preprocessing method for mining customer survey data using a unified data model. Traditional preprocessing requires transforming raw data separately for each data mining algorithm, requiring significant time. The proposed method defines a standard unified data model based on survey data characteristics. Raw data is mapped to this model, reducing the number of transformations from multiple per algorithm to just one per data set. This unified approach saves substantial time in preprocessing while maintaining flexibility for different mining tools.
Introduction to Datamining Concept and TechniquesSơn Còm Nhom
This document provides an introduction to data mining techniques. It discusses data mining concepts like data preprocessing, analysis, and visualization. For data preprocessing, it describes techniques like similarity measures, down sampling, and dimension reduction. For data analysis, it explains clustering, classification, and regression methods. Specifically, it gives examples of k-means clustering and support vector machine classification. The goal of data mining is to retrieve hidden knowledge and rules from data.
Recommendation system using bloom filter in mapreduceIJDKP
Many clients like to use the Web to discover product details in the form of online reviews. The reviews are
provided by other clients and specialists. Recommender systems provide an important response to the
information overload problem as it presents users more practical and personalized information facilities.
Collaborative filtering methods are vital component in recommender systems as they generate high-quality
recommendations by influencing the likings of society of similar users. The collaborative filtering method
has assumption that people having same tastes choose the same items. The conventional collaborative
filtering system has drawbacks as sparse data problem & lack of scalability. A new recommender system is
required to deal with the sparse data problem & produce high quality recommendations in large scale
mobile environment. MapReduce is a programming model which is widely used for large-scale data
analysis. The described algorithm of recommendation mechanism for mobile commerce is user based
collaborative filtering using MapReduce which reduces scalability problem in conventional CF system.
One of the essential operations for the data analysis is join operation. But MapReduce is not very
competent to execute the join operation as it always uses all records in the datasets where only small
fraction of datasets are applicable for the join operation. This problem can be reduced by applying
bloomjoin algorithm. The bloom filters are constructed and used to filter out redundant intermediate
records. The proposed algorithm using bloom filter will reduce the number of intermediate results and will
improve the join performance.
This document discusses various data mining functionalities including classification, clustering, association rule mining, and numeric prediction. It provides examples of each functionality using sample datasets. Classification techniques discussed include decision trees, rules, neural networks, naive Bayes, and support vector machines. Clustering is described as an unsupervised technique to group similar instances. Association rule mining is used to find frequent patterns and correlations in transactional data. Numeric prediction extends classification to predict numeric rather than categorical targets.
This document provides an overview of knowledge discovery and data mining in databases. It discusses how knowledge discovery in databases is the process of finding useful knowledge from large datasets, with data mining being the core step that extracts patterns from data. The document outlines the common steps in the knowledge discovery process, including data preparation, data mining algorithm selection and employment, pattern evaluation, and incorporating discovered knowledge. It also describes different data mining techniques such as prediction, classification, and clustering and their goals of extracting meaningful information from data.
The document discusses data mining and its history and applications. It explains that data mining involves extracting useful patterns from large amounts of data, and has been used in applications like market analysis, fraud detection, and science. The document outlines the data mining process, including data selection, cleaning, transformation, algorithm selection, and pattern evaluation. It also discusses common data mining techniques like association rule mining to find frequent patterns in transactional data.
This document discusses classification and prediction in data analysis. It defines classification as predicting categorical class labels, such as predicting if a loan applicant is risky or safe. Prediction predicts continuous numeric values, such as predicting how much a customer will spend. The document provides examples of classification, including a bank predicting loan risk and a company predicting computer purchases. It also provides an example of prediction, where a company predicts customer spending. It then discusses how classification works, including building a classifier model from training data and using the model to classify new data. Finally, it discusses decision tree induction for classification and the k-means algorithm.
This document provides an overview of a SQL Server 2008 for Business Intelligence short course. It discusses the course instructor's background and specialties. The course will cover creating a data warehouse, OLAP cubes, and reports. It will also discuss data mining concepts like why it's used, common algorithms, and include a hands-on lab. Data mining algorithms that will be covered include classification, clustering, decision trees, and neural networks.
The document discusses knowledge acquisition and data mining. It begins by defining knowledge acquisition as the process of discovering useful patterns or rules in large quantities of data through automatic or semi-automatic means. It then discusses why knowledge acquisition is important due to factors like data explosion and competitive pressure. The document also discusses different types of knowledge that can be mined, including classes, clusters, associations and sequential patterns. It outlines the predictive and descriptive approaches in data mining and common tasks like classification, clustering and association rule mining. Finally, it presents the typical steps in the knowledge discovery process including data selection, pre-processing, transformation, data mining, and interpretation.
Data mining techniques are used to analyze large datasets and discover hidden patterns. There are three main types of data mining techniques: supervised, unsupervised, and semi-supervised learning. Supervised learning uses labeled training data to learn relationships between inputs and outputs. Unsupervised learning looks for patterns in unlabeled data. Semi-supervised learning uses some labeled and mostly unlabeled data. The knowledge discovery in databases (KDD) process is a nine step method for applying data mining techniques which includes data selection, preprocessing, transformation, mining, and interpretation.
One of the most important problems in modern finance is finding efficient ways to summarize and visualize
the stock market data to give individuals or institutions useful information about the market behavior for
investment decisions Therefore, Investment can be considered as one of the fundamental pillars of national
economy. So, at the present time many investors look to find criterion to compare stocks together and
selecting the best and also investors choose strategies that maximize the earning value of the investment
process. Therefore the enormous amount of valuable data generated by the stock market has attracted
researchers to explore this problem domain using different methodologies. Therefore research in data
mining has gained a high attraction due to the importance of its applications and the increasing generation
information. So, Data mining tools such as association rule, rule induction method and Apriori algorithm
techniques are used to find association between different scripts of stock market, and also much of the
research and development has taken place regarding the reasons for fluctuating Indian stock exchange.
But, now days there are two important factors such as gold prices and US Dollar Prices are more
dominating on Indian Stock Market and to find out the correlation between gold prices, dollar prices and
BSE index statistical correlation is used and this helps the activities of stock operators, brokers, investors
and jobbers. They are based on the forecasting the fluctuation of index share prices, gold prices, dollar
prices and transactions of customers. Hence researcher has considered these problems as a topic for
research.
This document discusses knowledge patterns, which are invariances or regularities that exist across different types of data and domains. It provides examples of knowledge patterns found in linguistic resources, data, interactions, and semantic resources. It also discusses using knowledge patterns as expertise units and how patterns can be represented at different levels of abstraction through morphisms. Finally, it discusses some examples of problems involving temporal and procedural patterns as well as anti-patterns to avoid in knowledge modeling.
Demo: Profiling & Exploration of Linked Open DataStefan Dietze
This document discusses profiling and exploring linked datasets on the web. It describes the LinkedUp dataset catalog which classifies datasets by type, topic, quality and accessibility. The catalog allows querying across distributed datasets. Topic profiles of datasets are extracted by entity disambiguation and mapping dataset schemas. Visualizations show the relationships between datasets, topics and categories. Lessons learned are that broad categories from DBpedia introduce noise, and type-specific views of datasets can provide more precise topic profiles, as demonstrated in an explorer of educational datasets.
The document discusses data preprocessing techniques in data mining. It covers why preprocessing is important due to real-world data often being dirty, incomplete, noisy or inconsistent. The major tasks of preprocessing are described as data cleaning, integration, transformation, reduction and discretization. Specific techniques covered include handling missing data, noisy data, data smoothing methods like binning, regression and clustering. Descriptive data analysis methods like histograms, boxplots and scatter plots are also summarized.
Survey on Various Classification Techniques in Data Miningijsrd.com
Dynamic Classification is an information mining (machine learning) strategy used to anticipate bunch participation for information cases. In this paper, we show the essential arrangement systems. A few significant sorts of arrangement technique including induction, Bayesian networks, k-nearest neighbor classifier, case-based reasoning, genetic algorithm and fuzzy logic techniques. The objective of this review is to give a complete audit of distinctive characterization procedures in information mining.
Data mining involves multiple steps in the knowledge discovery process including data cleaning, integration, selection, transformation, mining, and pattern evaluation. It has various functionalities including descriptive mining to characterize data, predictive mining for inference, and different mining techniques like classification, association analysis, clustering, and outlier analysis.
This document provides an overview of key aspects of data preparation and processing for data mining. It discusses the importance of domain expertise in understanding data. The goals of data preparation are identified as cleaning missing, noisy, and inconsistent data; integrating data from multiple sources; transforming data into appropriate formats; and reducing data through feature selection, sampling, and discretization. Common techniques for each step are outlined at a high level, such as binning, clustering, and regression for handling noisy data. The document emphasizes that data preparation is crucial and can require 70-80% of the effort for effective real-world data mining.
This document discusses various data mining techniques, including artificial neural networks. It provides an overview of the knowledge discovery in databases process and the cross-industry standard process for data mining. It also describes techniques such as classification, clustering, regression, association rules, and neural networks. Specifically, it discusses how neural networks are inspired by biological neural networks and can be used to model complex relationships in data.
The document provides an introduction to data mining and knowledge discovery. It discusses how large amounts of data are extracted and transformed into useful information for applications like market analysis and fraud detection. The key steps in the knowledge discovery process are described as data cleaning, integration, selection, transformation, mining, pattern evaluation, and knowledge presentation. Common data sources, database architectures, and types of coupling between data mining systems and databases are also outlined.
An efficient data preprocessing method for miningKamesh Waran
This document proposes an efficient data preprocessing method for mining customer survey data using a unified data model. Traditional preprocessing requires transforming raw data separately for each data mining algorithm, requiring significant time. The proposed method defines a standard unified data model based on survey data characteristics. Raw data is mapped to this model, reducing the number of transformations from multiple per algorithm to just one per data set. This unified approach saves substantial time in preprocessing while maintaining flexibility for different mining tools.
Introduction to Datamining Concept and TechniquesSơn Còm Nhom
This document provides an introduction to data mining techniques. It discusses data mining concepts like data preprocessing, analysis, and visualization. For data preprocessing, it describes techniques like similarity measures, down sampling, and dimension reduction. For data analysis, it explains clustering, classification, and regression methods. Specifically, it gives examples of k-means clustering and support vector machine classification. The goal of data mining is to retrieve hidden knowledge and rules from data.
Recommendation system using bloom filter in mapreduceIJDKP
Many clients like to use the Web to discover product details in the form of online reviews. The reviews are
provided by other clients and specialists. Recommender systems provide an important response to the
information overload problem as it presents users more practical and personalized information facilities.
Collaborative filtering methods are vital component in recommender systems as they generate high-quality
recommendations by influencing the likings of society of similar users. The collaborative filtering method
has assumption that people having same tastes choose the same items. The conventional collaborative
filtering system has drawbacks as sparse data problem & lack of scalability. A new recommender system is
required to deal with the sparse data problem & produce high quality recommendations in large scale
mobile environment. MapReduce is a programming model which is widely used for large-scale data
analysis. The described algorithm of recommendation mechanism for mobile commerce is user based
collaborative filtering using MapReduce which reduces scalability problem in conventional CF system.
One of the essential operations for the data analysis is join operation. But MapReduce is not very
competent to execute the join operation as it always uses all records in the datasets where only small
fraction of datasets are applicable for the join operation. This problem can be reduced by applying
bloomjoin algorithm. The bloom filters are constructed and used to filter out redundant intermediate
records. The proposed algorithm using bloom filter will reduce the number of intermediate results and will
improve the join performance.
This document discusses various data mining functionalities including classification, clustering, association rule mining, and numeric prediction. It provides examples of each functionality using sample datasets. Classification techniques discussed include decision trees, rules, neural networks, naive Bayes, and support vector machines. Clustering is described as an unsupervised technique to group similar instances. Association rule mining is used to find frequent patterns and correlations in transactional data. Numeric prediction extends classification to predict numeric rather than categorical targets.
This document provides an overview of knowledge discovery and data mining in databases. It discusses how knowledge discovery in databases is the process of finding useful knowledge from large datasets, with data mining being the core step that extracts patterns from data. The document outlines the common steps in the knowledge discovery process, including data preparation, data mining algorithm selection and employment, pattern evaluation, and incorporating discovered knowledge. It also describes different data mining techniques such as prediction, classification, and clustering and their goals of extracting meaningful information from data.
The document discusses data mining and its history and applications. It explains that data mining involves extracting useful patterns from large amounts of data, and has been used in applications like market analysis, fraud detection, and science. The document outlines the data mining process, including data selection, cleaning, transformation, algorithm selection, and pattern evaluation. It also discusses common data mining techniques like association rule mining to find frequent patterns in transactional data.
This document discusses classification and prediction in data analysis. It defines classification as predicting categorical class labels, such as predicting if a loan applicant is risky or safe. Prediction predicts continuous numeric values, such as predicting how much a customer will spend. The document provides examples of classification, including a bank predicting loan risk and a company predicting computer purchases. It also provides an example of prediction, where a company predicts customer spending. It then discusses how classification works, including building a classifier model from training data and using the model to classify new data. Finally, it discusses decision tree induction for classification and the k-means algorithm.
This document provides an overview of a SQL Server 2008 for Business Intelligence short course. It discusses the course instructor's background and specialties. The course will cover creating a data warehouse, OLAP cubes, and reports. It will also discuss data mining concepts like why it's used, common algorithms, and include a hands-on lab. Data mining algorithms that will be covered include classification, clustering, decision trees, and neural networks.
The document discusses knowledge acquisition and data mining. It begins by defining knowledge acquisition as the process of discovering useful patterns or rules in large quantities of data through automatic or semi-automatic means. It then discusses why knowledge acquisition is important due to factors like data explosion and competitive pressure. The document also discusses different types of knowledge that can be mined, including classes, clusters, associations and sequential patterns. It outlines the predictive and descriptive approaches in data mining and common tasks like classification, clustering and association rule mining. Finally, it presents the typical steps in the knowledge discovery process including data selection, pre-processing, transformation, data mining, and interpretation.
Data mining techniques are used to analyze large datasets and discover hidden patterns. There are three main types of data mining techniques: supervised, unsupervised, and semi-supervised learning. Supervised learning uses labeled training data to learn relationships between inputs and outputs. Unsupervised learning looks for patterns in unlabeled data. Semi-supervised learning uses some labeled and mostly unlabeled data. The knowledge discovery in databases (KDD) process is a nine step method for applying data mining techniques which includes data selection, preprocessing, transformation, mining, and interpretation.
One of the most important problems in modern finance is finding efficient ways to summarize and visualize
the stock market data to give individuals or institutions useful information about the market behavior for
investment decisions Therefore, Investment can be considered as one of the fundamental pillars of national
economy. So, at the present time many investors look to find criterion to compare stocks together and
selecting the best and also investors choose strategies that maximize the earning value of the investment
process. Therefore the enormous amount of valuable data generated by the stock market has attracted
researchers to explore this problem domain using different methodologies. Therefore research in data
mining has gained a high attraction due to the importance of its applications and the increasing generation
information. So, Data mining tools such as association rule, rule induction method and Apriori algorithm
techniques are used to find association between different scripts of stock market, and also much of the
research and development has taken place regarding the reasons for fluctuating Indian stock exchange.
But, now days there are two important factors such as gold prices and US Dollar Prices are more
dominating on Indian Stock Market and to find out the correlation between gold prices, dollar prices and
BSE index statistical correlation is used and this helps the activities of stock operators, brokers, investors
and jobbers. They are based on the forecasting the fluctuation of index share prices, gold prices, dollar
prices and transactions of customers. Hence researcher has considered these problems as a topic for
research.
This document discusses knowledge patterns, which are invariances or regularities that exist across different types of data and domains. It provides examples of knowledge patterns found in linguistic resources, data, interactions, and semantic resources. It also discusses using knowledge patterns as expertise units and how patterns can be represented at different levels of abstraction through morphisms. Finally, it discusses some examples of problems involving temporal and procedural patterns as well as anti-patterns to avoid in knowledge modeling.
Demo: Profiling & Exploration of Linked Open DataStefan Dietze
This document discusses profiling and exploring linked datasets on the web. It describes the LinkedUp dataset catalog which classifies datasets by type, topic, quality and accessibility. The catalog allows querying across distributed datasets. Topic profiles of datasets are extracted by entity disambiguation and mapping dataset schemas. Visualizations show the relationships between datasets, topics and categories. Lessons learned are that broad categories from DBpedia introduce noise, and type-specific views of datasets can provide more precise topic profiles, as demonstrated in an explorer of educational datasets.
The document summarizes recent developments in semantic search engines. It discusses the principles of the semantic web and languages like RDF, RDFS, and OWL. It then summarizes the Falcons semantic search engine and how it indexes and searches semantic web objects. It also discusses efforts by Google, Yahoo, and Microsoft to incorporate semantic data through rich snippets, SearchMonkey, and Schema.org. Finally, it introduces the Kngine search engine as a new promising engine that aims to go beyond existing sources by indexing structured information on the web.
The increasing amount of valuable semi-structured data has become available online. In this talk, we overview the state of the art in entity ranking over structured data ("linked data").
1. Knowledge discovery in production requires automation due to the growth of information, devices, and knowledge workers.
2. A core dataflow model engine is needed to preprocess data and compose networked intelligence solutions for emerging applications.
3. Product solutions include hybrid SaaS factory subscriptions and applications via an open marketplace to deliver business value such as increased productivity and test time reduction for electronics manufacturing customers.
PhD Dissertation Supporting tools for automated generation and visual editing...Álvaro Sicilia
This document describes research on supporting tools for automated generation and visual editing of relational-to-ontology mappings. It discusses two projects - RÉPENER, which aims to map energy efficiency databases to ontologies, and SEMANCO, which maps building product catalogs to ontologies. The document outlines automated approaches for generating initial mappings between relational databases and ontologies, and visual tools for editing such mappings. The goal is to support applications like semantic querying over relational data and the semantic annotation of building product catalogs.
This document provides information about the 2nd KEYSTONE Training School on Keyword Search in Big Linked Data that took place from July 18-22, 2016 in Santiago de Compostela, Spain. It discusses the KEYSTONE program, participants which included 38 trainees from 13 countries, the 8 trainers, and organizers. The program consisted of tutorials and hands-on sessions on linked open data, big data, information retrieval, evaluation, and industrial talks. Trainees also participated in a hackathon and social events included a city tour and dinner.
Starship Technologies was launched by Skype co-founders and is the world's first commercially available autonomous delivery technology. They have 80 employees including 30 engineers and have built 65 robots that have driven over 23,000 km on public sidewalks delivering packages for 5 clients in 4 countries without any accidents. They also have 6 patent applications filed and over 800 requests from potential clients.
Knowledge discovery in social media mining for market analysisSenuri Wijenayake
This document analyzes existing literature on using social media mining for market analysis through predictive analysis, community detection, and influence propagation. It discusses how social media data can be preprocessed and applied to predictive models to forecast trends. Community detection algorithms can identify online groups with similar interests based on sentiment analysis of opinions. Influence propagation methods aim to target influential users who can activate positive word-of-mouth marketing through their social connections. The document concludes that properly analyzed social media data has predictive power and can provide insights into customer requirements and influencing purchasing decisions when applied to statistical models.
In Search of a Semantic Book Search Engine: Are We There Yet?Irfan Ullah
The document discusses the need for a semantic book search engine that can leverage the structural semantics and logical connections within books. Existing search techniques treat books as plain text collections, resulting in inaccurate search results. A semantic book search engine would connect books in a graph-like structure using comprehensive book structure ontologies and domain-level ontologies. This would enable better book searching, ranking, recommendations, and fine-grained access to internal book elements like tables, figures, and passages.
WOTS2E: A Search Engine for a Semantic Web of ThingsAndreas Kamilaris
A Semantic Web of Things (SWoT) brings together the Semantic Web and the Web of Things (WoT), associating
semantically annotated information to web-enabled physical de-
vices, services and their data, towards seamless data integration and better understanding of real-world information. A missing element in order to realize SWoT is a standardized, scalable and flexible way to globally discover in (near) real time web-connected embedded devices, as well as their semantic data. To address this gap, we propose WOT Semantic Search Engine (WOTS2E), which is a search engine for the SWoT, based on web crawling, being able to discover Linked Data endpoints and, through them, WoT-enabled devices and their services. In this presentation, we describe the design, development and implementation of WOTS2E, as well as an evaluation procedure showing its operation and performance across the web.
The document discusses data mining and knowledge discovery from large datasets. It begins by defining the terms data, information, knowledge, and wisdom. It then explains that the growth of data from various sources has created a need for data mining to extract useful knowledge from large datasets. Data mining involves automated analysis techniques from fields like machine learning, statistics, and database management to discover patterns and relationships in data. The knowledge discovery process involves data preparation, data mining, and evaluation of the extracted patterns. The document provides examples of data mining applications in business, science, fraud detection, and web mining.
This document discusses semantic search over the web. It begins by introducing semantic search and how it aims to improve search accuracy by understanding context. It then discusses several technologies used to publish structured data on the web, including Resource Description Framework (RDF), Microformats, RDFa, Microdata, and Linked Data. It also covers challenges like semantic heterogeneity and data quality when dealing with structured data on the web. Finally, it discusses approaches to storing and indexing structured RDF data, including relational and entity-based perspectives.
Knowledge discovery in databases involves the non-trivial extraction of implicit and previously unknown information from large amounts of data. As data and information doubles every 20 months, knowledge discovery is needed to help analyze growing data volumes and extract useful knowledge. Knowledge discovery aims to find certain, interesting, and efficient patterns in data and is related to approaches like database management, expert systems, statistics, and scientific discovery. It has many applications in fields such as science, marketing, investments, and fraud detection.
1) Knowledge management in organizations is influenced by various managerial, resource, and environmental factors.
2) Managerial influences include leadership, coordination, control, and measurement of knowledge activities. Effective leadership and coordination of knowledge resources are important.
3) Resource influences refer to financial resources, knowledge manipulation skills of employees, and knowledge resources themselves. The availability of these resources impacts knowledge management.
4) Environmental factors outside an organization's control, such as competition, markets, and social trends can also constrain or enable knowledge management activities.
KDD is the process of automatically extracting hidden patterns from large datasets. It involves data cleaning, reduction, exploration, modeling, and interpretation to discover useful knowledge. The goal is to gain a competitive advantage by providing improved services through understanding of the data.
Knowledge Discovery using an Integrated Semantic WebMichel Dumontier
The document discusses HyQue, a system for knowledge discovery that facilitates hypothesis formulation and evaluation by leveraging Semantic Web technologies to provide access to facts, expert knowledge, and web services. HyQue uses an event-based data model and domain rules to calculate a quantitative measure of evidence for hypothesized events. It aims to enable users to pose a hypothesis and have the system automatically evaluate it using available data, ontologies, and services.
Data mining , Knowledge Discovery Process, ClassificationDr. Abdul Ahad Abro
The document provides an overview of data mining techniques and processes. It discusses data mining as the process of extracting knowledge from large amounts of data. It describes common data mining tasks like classification, regression, clustering, and association rule learning. It also outlines popular data mining processes like CRISP-DM and SEMMA that involve steps of business understanding, data preparation, modeling, evaluation and deployment. Decision trees are presented as a popular classification technique that uses a tree structure to split data into nodes and leaves to classify examples.
This document provides an overview of data mining segmentation techniques. It discusses the value of data mining, common segmentation methodologies, tools in SQL Server Analysis Services for segmentation, and ways to build confidence in segmentation models. Key points include discussing unsupervised vs supervised learning for segmentation, preparing data sources and refining data, using algorithms like decision trees and clustering for segmentation analysis, and improving models through changing algorithms, parameters, or cleaning the data.
The document provides an overview of data mining techniques and related concepts. It defines data mining and compares it to knowledge discovery in databases (KDD). It discusses the basic data mining tasks of classification, clustering, association rule mining, and summarization. It also covers related areas like databases, statistics, machine learning, and visualization techniques used in data mining. Finally, it provides an overview of common data mining techniques including decision trees, neural networks, genetic algorithms, and others.
The document discusses data warehousing, data mining, and business intelligence applications. It explains that data warehousing organizes and structures data for analysis, and that data mining involves preprocessing, characterization, comparison, classification, and forecasting of data to discover knowledge. The final stage is presenting discovered knowledge to end users through visualization and business intelligence applications.
The document provides an overview of machine learning activities including data exploration, preprocessing, model selection, training and evaluation. It discusses exploring different data types like numerical, categorical, time series and text data. It also covers identifying and addressing data issues, feature engineering, selecting appropriate models for supervised and unsupervised problems, training models using methods like holdout and cross-validation, and evaluating model performance using metrics like accuracy, confusion matrix, F-measure etc. The goal is to understand the data and apply necessary steps to build and evaluate effective machine learning models.
This document discusses various data reduction techniques including dimensionality reduction through attribute subset selection, numerosity reduction using parametric and non-parametric methods like data cube aggregation, and data compression. It describes how attribute subset selection works to find a minimum set of relevant attributes to make patterns easier to detect. Methods for attribute subset selection include forward selection, backward elimination, and bi-directional selection. Decision trees can also help identify relevant attributes. Data cube aggregation stores multidimensional summarized data to provide fast access to precomputed information.
Data preprocessing transforms raw data into a format that is suitable for machine learning algorithms. It involves cleaning data by handling missing values, outliers, and inconsistencies. Dimensionality reduction techniques like principal component analysis are used to reduce the number of features by creating new features that are combinations of the originals. Feature encoding converts categorical features into numeric values that machines can understand through techniques like one-hot encoding. The goal of preprocessing is to prepare data so machine learning algorithms can more easily interpret features and patterns in the data.
This document outlines a course on knowledge acquisition in decision making, including the course objectives of introducing data mining techniques and enhancing skills in applying tools like SAS Enterprise Miner and WEKA to solve problems. The course content is described, covering topics like the knowledge discovery process, predictive and descriptive modeling, and a project presentation. Evaluation includes assignments, case studies, and a final exam.
This document outlines the objectives, content, evaluation, and prerequisites for a course on Knowledge Acquisition in Decision Making, which introduces students to data mining techniques and how to apply them to solve business problems using SAS Enterprise Miner and WEKA. The course covers topics such as data preprocessing, predictive modeling with decision trees and neural networks, descriptive modeling with clustering and association rules, and a project presentation. Students will be evaluated based on assignments, case studies, a project, quizzes, class participation, and a final exam.
The document discusses data mining and knowledge discovery in databases. It defines data mining as extracting patterns from large amounts of data. The key steps in the knowledge discovery process are presented as data selection, preprocessing, data mining, and interpretation. Common data mining techniques include clustering, classification, and association rule mining. Clustering groups similar data objects, classification predicts categorical labels, and association rules find relationships between variables. Data mining has applications in many domains like market analysis, fraud detection, and bioinformatics.
Introduction to the implementation of Data Science projects in organizations, with a practice session on how to apply machine-learning techniques to a business problem.
Notebook of the practice session is available at https://github.com/klinamen/ds0-experimenting-with-data
Lesson 1 - Overview of Machine Learning and Data Analysis.pptxcloudserviceuit
This document provides an overview of machine learning and data analysis. It defines machine learning as a field of artificial intelligence that enables computers to learn from data without being explicitly programmed. The main types of machine learning are supervised, unsupervised, and reinforcement learning. Data analysis is the process of extracting meaningful insights from data through techniques like cleaning, exploring for patterns/trends, statistical analysis, and visualization. Machine learning automates many data analysis tasks and can be applied through techniques like classification, clustering, and regression. The relationship between machine learning and data analysis fuels discovery, with data analysis providing foundation and machine learning generating insights.
Lecture 09(introduction to machine learning)Jeet Das
Machine learning allows computers to learn without explicit programming by analyzing data to recognize patterns and make predictions. It can be supervised, learning from labeled examples to classify new data, or unsupervised, discovering hidden patterns in unlabeled data through clustering. Key aspects include feature representation, distance metrics to compare examples, and evaluation methods like measuring error on test data to avoid overfitting to the training data.
This document discusses various techniques for machine learning when labeled training data is limited, including semi-supervised learning approaches that make use of unlabeled data. It describes assumptions like the clustering assumption, low density assumption, and manifold assumption that allow algorithms to learn from unlabeled data. Specific techniques covered include clustering algorithms, mixture models, self-training, and semi-supervised support vector machines.
This document provides an overview of machine learning concepts including:
- Machine learning uses data and past experiences to improve future performance on tasks. Learning is guided by minimizing loss or maximizing gain.
- The machine learning process involves data collection, representation, modeling, estimation, and model selection. Representation of input data is important for solving problems.
- Types of learning problems include supervised learning (classification, regression), unsupervised learning (clustering, dimensionality reduction), and reinforcement learning.
- Generalization to new data is important but challenging due to the bias-variance tradeoff. Models can underfit or overfit training data. Appropriate model complexity and regularization are important.
This document provides an overview of machine learning concepts including:
- Machine learning uses data and past experiences to improve future performance on tasks. Learning is guided by minimizing loss or maximizing gain.
- The machine learning process involves data collection, representation, modeling, estimation, and model selection. Representation of input data is important for solving problems.
- Types of learning problems include supervised learning (classification, regression), unsupervised learning (clustering, dimensionality reduction), and reinforcement learning.
- Generalization to new data is important but challenging due to the bias-variance tradeoff. Models can underfit or overfit training data. Regularization and more data help address overfitting.
This document provides an overview of machine learning concepts including:
- Machine learning uses data and past experiences to improve future performance on tasks. Learning is guided by minimizing loss or maximizing gain.
- The machine learning process involves data collection, representation, modeling, estimation, and model selection. Representation of input data is important for solving problems.
- Types of learning problems include supervised learning (classification, regression), unsupervised learning (clustering, dimensionality reduction), and reinforcement learning.
- Generalization to new data is important but challenging due to the bias-variance tradeoff. Models can underfit or overfit training data. Regularization and more data help address overfitting.
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Tags: Information Security, ISO/IEC 27001, ISO/IEC 42001, Artificial Intelligence, GDPR
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How to Fix the Import Error in the Odoo 17Celine George
An import error occurs when a program fails to import a module or library, disrupting its execution. In languages like Python, this issue arises when the specified module cannot be found or accessed, hindering the program's functionality. Resolving import errors is crucial for maintaining smooth software operation and uninterrupted development processes.
How to Build a Module in Odoo 17 Using the Scaffold MethodCeline George
Odoo provides an option for creating a module by using a single line command. By using this command the user can make a whole structure of a module. It is very easy for a beginner to make a module. There is no need to make each file manually. This slide will show how to create a module using the scaffold method.
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it describes the bony anatomy including the femoral head , acetabulum, labrum . also discusses the capsule , ligaments . muscle that act on the hip joint and the range of motion are outlined. factors affecting hip joint stability and weight transmission through the joint are summarized.
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The simplified electron and muon model, Oscillating Spacetime: The Foundation...RitikBhardwaj56
Discover the Simplified Electron and Muon Model: A New Wave-Based Approach to Understanding Particles delves into a groundbreaking theory that presents electrons and muons as rotating soliton waves within oscillating spacetime. Geared towards students, researchers, and science buffs, this book breaks down complex ideas into simple explanations. It covers topics such as electron waves, temporal dynamics, and the implications of this model on particle physics. With clear illustrations and easy-to-follow explanations, readers will gain a new outlook on the universe's fundamental nature.
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RPMS TEMPLATE FOR SCHOOL YEAR 2023-2024 FOR TEACHER 1 TO TEACHER 3
Tutorial Knowledge Discovery
1. Knowledge Discovery for the Semantic Web
under the Data Mining Perspective
Claudia d'Amato
Department of Computer Science
University of Bari
Italy
2. Knowledge Disovery: Definition
Knowledge Discovery (KD)
“the process of automatically searching large volumes of data
for patterns that can be considered knowledge about the
data” [Fay'96]
Patterns need to be:
New – Hidden in the data
Useful
Understandable
3. What is a Pattern and Knowldge?
Pattern
expression E in a given language L describing a subset FE
of
facts F.
E is called pattern if it is simpler than enumerating facts in FE
Knowledge
awareness or understanding of facts, information, descriptions,
or skills, which is acquired through experience or education
by perceiving, discovering, or learning
4. Knowledge Discovery
and Data Minig
KD is often related with Data Mining (DM) field
DM is one step of the "Knowledge Discovery in Databases"
process (KDD)[Fay'96]
DM is the computational process of discovering patterns in
large data sets involving methods at the intersection of
artificial intelligence, machine learning, statistics, and
databases.
DM goal: extracting information from a data set and
transforming it into an understandable
structure/representation for further use
5. What is not DM
Not all information discovery tasks are considered to be DM.
Looking up individual records using a DBMS
Finding particular Web pages via a query to a search engine
Tasks releted to the Information Retrieval (IR)
Nonetheless, DM techniques can been used to improve IR
systems
e.g. to create index structures for efficiently organizing and
retrieving information
6. The KDD process
Input
Data
Data Preprocessing
and Transformation
Data Mining
Interpretation
and
Evaluation
Information/
Taking Action
Data fusion (multiple sources)
Data Cleaning (noise,missing val.)
Feature Selection
Dimentionality Reduction
Data Normalization
The most labourous and
time consuming step
Filtering Patterns
Visualization
Statistical Analysis
- Hypothesis testing
- Attribute evaluation
- Comparing learned models
- Computing Confidence Intervals
CRISP-DM (Cross Industry Standard Process for Data
Mining) alternative process model developed by a
consortium of several companies
All data mining methods use induction-based learing
The knowledge
gained at the end of
the process is given
as a model/data
generalization
7. The KDD process
Input
Data
Data Preprocessing
and Transformation
Data
Mining
Interpretation
and
Evaluation
Information/
Taking Action
Data fusion (multiple sources)
Data Cleaning (noise,missing val.)
Feature Selection
Dimentionality Reduction
Data Normalization
The most labourous and
time consuming step
Filtering Patterns
Visualization
Statistical Analysis
- Hypothesis testing
- Attribute evaluation
- Comparing learned models
- Computing Confidence Intervals
CRISP-DM (Cross Industry Standard Process for Data
Mining) alternative process model developed by a
consortium of several companies
All data mining methods use induction-based learing
The knowledge
gained at the end of
the process is given
as a model/data
generalization
8. Data Mining Tasks...
Predictive Tasks: predict the value of a particular attribute
(called target or dependent variable) based on the value of
other attributes (called explanatory or independent
variables)
Goal: learning a model that minimizes the error between the
predicted and the true values of the target variable
Classification → discrete target variables
Regression → continuous target variables
9. ...Data Mining Tasks...
Examples of Classification tasks
Develop a profile of a “successfull” person
Predict customers that will respond to a marketing
compain
Examples of Regression tasks
Forecasting the future price of a stock
10. … Data Mining Tasks...
Descriptive tasks: discover patterns (correlations, clusters,
trends, trajectories, anomalies) summarizing the underlying
relationship in the data
Association Analysis: discovers (the most interesting)
patterns describing strongly associated features in the
data/relationships among variables
Cluster Analysis: discovers groups of closely related
facts/observations. Facts belonging to the same cluster
are more similar each other than observations
belonging other clusters
11. ...Data Mining Tasks...
Examples of Association Analysis tasks
Market Basket Analysis
Discoverying interesting relationships among retail
products. To be used for:
Arrange shelf or catalog items
Identify potential cross-marketing strategies/cross-
selling opportunities
Examples of Cluster Analysis tasks
Automaticaly grouping documents/web pages with
respect to their main topic (e.g. sport, economy...)
12. … Data Mining Tasks
Anomaly Detection: identifies facts/observations
(Outlier/change/deviation detection) having
characteristics significantly different from the rest of the
data. A good anomaly detector has a high detection rate
and a low false alarm rate.
• Example: Determine if a credit card purchase is
fraudolent → Imbalance learning setting
Approaches:
Supervised: build models by using input attributes to predict
output attribute values
Unsupervised: build models/patterns without having any
output attributes
13. The KDD process
Input
Data
Data Preprocessing
and Transformation
Data Mining
Interpretation
and
Evaluation
Information/
Taking Action
Data fusion (multiple sources)
Data Cleaning (noise,missing val.)
Feature Selection
Dimentionality Reduction
Data Normalization
The most labourous and
time consuming step
Filtering Patterns
Visualization
Statistical Analysis
- Hypothesis testing
- Attribute evaluation
- Comparing learned models
- Computing Confidence Intervals
CRISP-DM (Cross Industry Standard Process for Data
Mining) alternative process model developed by a
consortium of several companies
All data mining methods use induction-based learing
The knowledge
gained at the end of
the process is given
as a model/ data
generalization
14. A closer look at the Evalaution step
Given
DM task (i.e. Classification, clustering etc.)
A particular problem for the chosen task
Several DM algorithms can be used to solve the problem
1) How to assess the performance of an algorithm?
2) How to compare the performance of different
algorithms solving the same problem?
16. Assessing Algorithm Performances
Components for supervised learning [Roiger'03]
Test data missing in unsupervised setting
Instances
Attributes
Data
Training
Data
Test Data
Model
Builder
Supervised
Model
Evaluation
Parameters
Performance
Measure
(Task Dependent)
Examples of Performace Measures
Classification → Predictive Accuracy
Regression → Mean Squared Error (MSE)
Clustering → Cohesion Index
Association Analysis → Rule Confidence
….....
17. Supervised Setting: Building Training and Test Set
Necessary to predict performance bounds based with whatever
data (independent test set)
Split data into training and test set
The repeated and stratified k-fold cross-validation is
the most widly used technique
Leave-one-out or bootstrap used for small datasets
Make a model on the training set and evaluate it out on the
test set [Witten'11]
e.g. Compute predictive accuracy/error rate
18. K-Fold Cross-validation (CV)
First step: split data into k subsets of equal size
Second step: use each subset in turn for testing, the
remainder for training
Subsets often stratified → reduces variance
Error estimates averaged to yield the overall error
estimate
Even better: repeated stratified cross-validation
E.g. 10-fold cross-validation is repeated 15 times
and results are averaged → reduces the variance
Test set step 1 Test set step 2 …..........
19. Leave-One-Out cross-validation
Leave-One-Out:
a particular form of cross-validation:
Set number of folds to number of training instances
I.e., for n training instances, build classifier n times
The results of all n judgement are averaged for
determining the final error estimate
Makes best use of the data for training
Involves no random subsampling
There's no point in repeating it → the same result will be
obtained each time
20. The bootstrap
CV uses sampling without replacement
The same instance, once selected, cannot be selected
again for a particular training/test set
Bootstrap uses sampling with replacement
Sample a dataset of n instances n times with
replacement to form a new dataset
Use this new dataset as the training set
Use the remaining instances not occurting in the
training set for testing
Also called the 0.632 bootstrap → The training data
will contain approximately 63.2% of the total instances
21. Estimating error
with the bootstrap
The error estimate of the true error on the test data will be
very pessimistic
Trained on just ~63% of the instances
Therefore, combine it with the resubstitution error:
The resubstitution error (error on training data) gets less
weight than the error on the test data
Repeat the bootstrap procedure several times with different
replacement samples; average the results
23. Comparing Algorithms Performance
Frequent question: which of two learning algorithms performs
better?
Note: this is domain dependent!
Obvious way: compare the error rates computed by the use of
k-fold CV estimates
Problem: variance in estimate on a single 10-fold CV
Variance can be reduced using repeated CV
However, we still don’t know whether the results are reliable
24. Significance tests
Significance tests tell how confident we can be that there
really is a difference between the two learning algorithms
Statistical hypothesis test exploited → used for testing a
statistical hypothesis
Null hypothesis: there is no significant (“real”)
difference (between the algorithms)
Alternative hypothesis: there is a difference
Measures how much evidence there is in favor of rejecting
the null hypothesis for a specified level of significance
– Compare two learning algorithms by comparing
e.g. the average error rate over several cross-
validations (see [Witten'11] for details)
26. DM methods and SW: a closer look
Classical DM algorithms originally developed for
propositional representations
Some upgrades to (multi-)relational and graph
representations defined
Semantic Web: characterized by
Rich/expressive representations (RDFS, OWL)
– How to cope with them when applying DM algorithms?
Open world Assumpion (OWA)
– DM algorithms grounded on CWA
– Are metrics for classical DM tasks still applicable?
27. Exploiting DM methods in SW...
Approximate inductive instance retrieval
assess the class membership of the individuals in a KB
w.r.t. a query concept [Fanizzi'12]
(Hyerarchical) Type prediciton
– Assess the type of instances in RDF datasets [Melo'14]
Link Prediction
Given an individual and a role R, predict the other
individuals a is in R relation with [Minervini'14]
Regarded as a classification problem → (semi-)automatic
ontology population
28. ...Exploiting DM mthods in SW...
Automatic concept drift and novelty detection [Fanizzi'09]
change of a concept towards a more general/specific
one w.r.t. the evidence provided by new annotated
individuals
Ex.: almost all Worker work for more than 10 hours
per days → HardWorker
isolated cluster may require to be defined through new
emerging concepts to be added to ontology
Ex.: subset of Worker employed in a company →
Employee
Ex.: subset of Worker working for several
companies → Free-lance
Regarded as a (conceptual) clustering problem
29. ...Exploiting DM mthods in SW
Semi-automatic ontology enrichment [d'Amato'10,Völker'11,
Völker'15,d'Amato'16]
exploiting the evidence coming from the data →
discovering hidden knowledge patterns in the form of
relational association rules
new axioms may be suggested → existing ontologies
can be extended
Regarded as a pattern discovery problem
31. Associative Analysis:
the Pattern Discovery Task
Problem Definition:
Given a dataset find
all possible hidden pattern in the form of Association Rule (AR)
having support and confidence greater than a minimum
thresholds
Definition: An AR is an implication expression of the form X → Y
where X and Y are disjoint itemsets
An AR expresses a co-occurrence relationship between the items
in the antecedent and the concequence not a causality relationship
32. Basic Definitions
An itemset is a finite set of assignments of the form {A1
= a1
, …,
Am
= am
} where Ai
are attributes of the dataset and ai
the
corresponding values
The support of an itemset is the number of istances/tuples in the
dataset containing it.
Similarily, support of a rule is s(X → Y ) = |(X Y)|;
The confidence of a rule provides how frequently items in the
consequence appear in instances/tuples containing the
antencedent
c(X → Y ) = |(X Y)| / |(X)| (seen as p(Y|X) )
33. Discoverying Association Rules: General Approach
Articulated in two main steps [Agrawal'93, Tan'06]:
1. Frequent Patterns Generation/Discovery (generally in the form
of itemsets) wrt a minimum frequency (support) threshold
Apriori algortihm → The most well known
algorithm
the most expensive computation;
2. Rule Generation
Extraction of all the high-confidence association
rules from the discovered frequent patterns.
34. Apriori Algortihm: Key Aspects
Uses a level-wise generate-and-test approach
Grounded on the non-monotonic property of the support of an
itemset
The support of an itemset never exceeds the support of its
subsets
Basic principle:
if an itemset is frequent → all its subsets must also be
frequent
If an itemset is infrequent → all its supersets must be
infrequent too
Allow to sensibly cut the search space
35. Apriori Algorithm in a Nutshell
Goal: Finding the frequent itemsets ↔ the sets of items that
satisfying the min support threshold
Iteratively find frequent itemsets with lenght from 1 to k (k-itemset)
Given a set Lk-1
of frequent (k-1)itemset, join Lk-1
with itself to obain
Lk
the candidate k-itemsets
Prune items in Lk
that are not frequent (Apriori principle)
If Lk
is not empty, generate the next candidate (k+1)itemset until
the frequent itemset is empty
36. Apriori Algorithm: Example...
Suppose having the transaction table
(Boolean values considered for simplicity)
Apply APRIORI algorithm
ID List of Items
T1 {I1,I2,I5}
T2 {I2,I4}
T3 {I2,I3}
T4 {I1,I2,I4}
T5 {I1,I3}
T6 {I2,I3}
T7 {I1,I3}
T8 {I1,I2,I3,I5}
T9 {I1,I2,I3}
38. ...Apriori Algorithm: Example
Itemset Prune
Infrequent
{I1,I2,I3} No
{I1,I2,I5} No
{I1,I2,I4} Yes {I1,I4}
{I1,I3,I5} Yes {I3,I5}
{I2,I3,I4} Yes {I3,I4}
{I2,I3,I5} Yes {I3,I5}
{I2,I4,I5} Yes {I4,I5}Output After Pruning
L4
Min.
Supp. 2
Pruning
Join for
candidate
generation
Itemset Sup.
Count
{I1,I2} 4
{I1,I3} 4
{I1,I5} 2
{I2,I3} 4
{I2,I4} 2
{I2,I5} 2
Apply Apriori
principle
Itemset Sup.
Count
{I1,I2,I3} 2
{I1,I2,I5} 2
Join for
candidate
generation
L3
Output After Pruning
Itemset Prune
Infrequent
{I1,I2,I3,I5} Yes {I3,I5}
Empty
Set
STOP
39. Generating ARs
from frequent itemsets
For each frequent itemset “I”
– generate all non-empty subsets S of I
For every non empty subset S of I
– compute the rule r := “S → (I-S)”
If conf(r) > = min confidence
– then output r
40. Genrating ARs: Example...
Given:
L = { {I1}, {I2}, {I3}, {I4}, {I5}, {I1,I2}, {I1,I3}, {I1,I5}, {I2,I3}, {I2,I4},
{I2,I5}, {I1,I2,I3}, {I1,I2,I5} }.
Let us fix 70% for the Minimum confidence threshold
Take l = {I1,I2,I5}.
All nonempty subsets are {I1,I2}, {I1,I5}, {I2,I5}, {I1}, {I2}, {I5}.
The resulting ARs and their confidence are:
R1: I1 AND I2 →I5
Conf(R1) = supp{I1,I2,I5}/supp{I1,I2} = 2/4 = 50% REJECTED
41. ...Generating ARs: Example...
Min. Conf. Threshold 70%; l = {I1,I2,I5}.
All nonempty subsets are {I1,I2}, {I1,I5}, {I2,I5}, {I1}, {I2}, {I5}.
The resulting ARs and their confidence are:
R2: I1 AND I5 →I2
Conf(R2) = supp{I1,I2,I5}/supp{I1,I5} = 2/2 = 100% RETURNED
R3: I2 AND I5 → I1
Conf(R3) = supp{I1,I2,I5}/supp{I2,I5} = 2/2 = 100% RETURNED
R4: I1 → I2 AND I5
Conf(R4) = sc{I1,I2,I5}/sc{I1} = 2/6 = 33% REJECTED
42. ...Genrating ARs: Example
Min. Conf. Threshold 70%; l = {I1,I2,I5}.
All nonempty subsets: {I1,I2}, {I1,I5}, {I2,I5}, {I1}, {I2}, {I5}.
The resulting ARs and their confidence are:
R5: I2 → I1 AND I5
Conf(R5) = sc{I1,I2,I5}/sc{I2} = 2/7 = 29% REJECTED
R6: I5 → I1 AND I2
Conf(R6) = sc{I1,I2,I5}/ {I5} = 2/2 = 100% RETURNED
Similarily for the other sets I in L (Note: it does not make sense to
consider an itemset made by just one element i.e. {I1} )
43. Identifying Representative Itemsets
When the number of discovered frequent itemsets is very high, it
could be useful to identify a representative set of itemsets from
which all other patters may be derived
Maximal Frequent Itemset: is a frequent itemset for which none
of its immediate supersets are frequent
Closed Frequent Itemset: is a frequent itemset for which none
of its immediate supersets has exactly its same support count
→ used for removing redundant rules
44. On improving Discovery of ARs
Apriori algorithm may degrade significantly for dense datasets
Alternative solutions:
FP-growth algorithm outperforms Apriori
Does not use the generate-and-test approach
Encodes the dataset in a compact data structure (FP-
Tree) and extract frequent itemsets directly from it
Usage of additional interenstingness metrics (besides support
and confidence) (see [Tan'06])
Lift, Interest Factor, correlation, IS Measure
45. Frequent Graph Patterns
Frequent Graph Patterns are subgraphs that are found from a
collection of graphs or a single massive graph, with a
frequency no less than a specifed support threshold
– Exploited for facilitating indexing and query processing
A graph g is a subgraph of another graph g' if there exists a
subgraph isomorphism from g to g' denoted by g g'. g' is
called a supergraph of g
46. Discoverying Frequent Graph Patterns
Apriori-based and pattern-growth appraoches have been formally
defined
Problems:
Giving suitable definitions for support and conficence for
frequent subgraph mining problem
Even more complicate for the case of a single large graph
[see Aggarwal'10 sect. 2.5]
Developed appraoches revealed infeasible in practice
47. Graph Mining: Current Approaches
Methods for mining [Aggarwal'10, ch. 3, 4]:
Significant (optimal) subgraphs according to an objective
function
In a timely way by accessing only a small subset of
promising subgraphs
Representative (orthogonal) subgraphs by exploiting a notion
of similarity
Avoid generating the complete set of frequent subgraphs while
presenting only a set of interesting subgraph patterns
48. Pattern Discovery on RDF data sets for Making Predictions
Proposed frameworks for discoverying ARs from:
●
RDF data sets [Galarraga'13, Galarraga'15]
➢
Inspired to ILP appraoches for discovering ARs from clausal
representation
➢
Exploits discovered ARs for making new role preditions
➢
Takes into account the underlying OWA
➢
Proposes new metrics for evaluating the prediction results
considering the OWA
●
Populated Ontological knowldge bases [d'Amato'16]
●
Exploits the available background knowledge
●
Exploits deductive reasoning capabilities
●
Discovered ARs can make concept and role predictions
49. Research Task: Goal
Moving from [d'Amato'16], [Galarraga'15]
define a method for Discoverying ARs from ontological KBs that
Makes additional usage of the available ontological knowledge
and its underlying semantics (e.g. Using hierarchy of roles)
Takes advantage of solutions for improving the performances
of the method with respect to scalability. Possible directions:
– Heuristics for further cutting the search space
– Indexing methods for caching the results of the
inferences made by the reasoner
apply the formalized method to a knowledge graph generated as
output of the first part of the talk
50. Research Task: Possible Research Questions...
●
Can the formalized method be applied straightforwardly to a
knowledge graph generated as output of the first part of the
talk? Is there any gap that needs to be filled? If so, what is
such a gap?
●
Is OWA the right way to go? In case you move towards CWA,
what is the impact of such a choice in your method and its
evaluation?
●
Is the exploitation of a reasoner and a background knowledge a
value added or a bottleneck?
51. ...Research Task: Possible Research Questions
●
Are the metrics proposed in the referenced papers enough? If
not:
➢
what are the aspects/effects/outputs that need to be
evalauted differently/further?
➢
what are the new/additional metrics that are necessary?
●
Is there any additional utility of the discovered rules
●
What is the chosen language for representing the discovered
rules? What is/are the motivation/s for it?
52. Research Task: Expected Output
4 Mins Presentation summarizing
[Galarraga'15/d'Amato'16] approach(es)
– only one group → 4 additional mins presentation
– Randomly decided when working on the research task
Proposed solution and its value added/advace with respect to
the references above
Replies to the proposed/new research questions, if any.
How do you plan to prove the value added of your proposal
53. Research Task: Groups Formation and Rules
●
Groups have to be composed of 7 members
●
Each group should has the following chracterstics
●
Members are different from the group for the mini-project
●
An overlap of maximum 2 members with respect to
the mini-project groups is allowed
●
Students that already know each other from preivous
experineces should belong to different groups
DON'T BE SHY
THERE ARE NO RIGHT OR WRONG ANSWERS
THIS IS THE TIME TO LEARN FROM INTERACTION
BE CREATIVE AND DON'T LIMIT YOURSELF
54. References...
[Fay'96] U. Fayyad, G. Piatetsky-Shapiro, P. Smyth. From
Data Mining to Knowledge Discovery: An Overview. Advances
in Knowledge Discovery and Data Mining, MIT Press, 1996.
[Agrawal'93] R. Agrawal, T. Imielinski, and A. N. Swami.
Mining association rules between sets of items in large
databases. Proc. of Int. Conf. on Management of Data, p.
207–216. ACM, 1993
[d'Amato'10] C. d'Amato, N. Fanizzi, F. Esposito: Inductive
learning for the Semantic Web: What does it buy? Semantic
Web 1(1-2): 53-59 (2010)
[Völker'11] J. Völker, M. Niepert: Statistical Schema Induction.
ESWC (1) 2011: 124-138
55. ...References...
●
[Völker'15] J. Völker, D. Fleischhacker, H. Stuckenschmidt:
Automatic acquisition of class disjointness. J. Web Sem. 35: 124-
139 (2015)
[d'Amato'16] C. d'Amato, S. Staab, A.G.B. Tettamanzi, T. Minh,
F.L. Gandon. Ontology enrichment by discovering multi-relational
association rules from ontological knowledge bases. SAC 2016:
333-338
[Tan'06] P.N. Tan, M. Steinbach, V. Kumar. Introduction to Data
Mining. Ch. 6 Pearson, 2006 . http://www-
users.cs.umn.edu/~kumar/dmbook/ch6.pdf
[Aggarwal'10] C. Aggarwal, H. Wang. Managing and Mining
Graph Data. Springer, 2010
56. ...References...
●
[Witten'11] I.H. Witten, E. Frank. Data Mining: Practical Machine
Learning Tool and Techiques with Java Implementations. Ch. 5.
Morgan-Kaufmann, 2011 (3rd
Edition)
●
[Fanizzi'12] N. Fanizzi, C. d'Amato, F. Esposito: Induction of
robust classifiers for web ontologies through kernel machines. J.
Web Sem. 11: 1-13 (2012)
●
[Minervini'14] P. Minervini, C. d'Amato, N. Fanizzi, F. Esposito:
Adaptive Knowledge Propagation in Web Ontologies. Proc. of
EKAW Conferece. Springer. pp. 304-319, 2014.
[Roiger'03] R.J. Roiger, M.W. Geatz. Data Mining. A Tutorial-
Based Primer. Addison Wesley, 2003
57. ...References
●
[Melo'16] A. Melo, H. Paulheim, J. Völker. Type Prediction in RDF
Knowledge Bases Using Hierarchical Multilabel Classification.
WIMS 2016: 14
●
[Galárraga'13] L. Galárraga, C. Teflioudi, F. Suchanek, K. Hose.
AMIE: Association Rule Mining under Incomplete Evidence in
Ontological Knowledge Bases. Proc. of WWW 2013.
http://luisgalarraga.de/docs/amie.pdf
[Fanizzi'09] N. Fanizzi, C. d'Amato, F. Esposito: Metric-based
stochastic conceptual clustering for ontologies. Inf. Syst. 34(8):
792-806, 2009
[Galárraga'15] L. Galárraga, C. Teflioudi, F. Suchanek, K. Hose.
Fast Rule Mining in Ontological Knowledge Bases with AMIE+.
VLDB Journal 2015.
http://suchanek.name/work/publications/vldbj2015.pdf