The document describes the backpropagation algorithm, which is commonly used to train artificial neural networks. It calculates the gradient of a loss function with respect to the network's weights in order to minimize the loss during training. The backpropagation process involves propagating inputs forward and calculating errors backward to update weights. It has advantages like being fast, simple, and not requiring parameter tuning. However, it can be sensitive to noisy data and outliers. Applications of backpropagation include speech recognition, character recognition, and face recognition.
hetero associative memory is a single layer neural network. However, in this network the input training vector and the output target vectors are not the same. The weights are determined so that the network stores a set of patterns. Hetero associative network is static in nature, hence, there would be no non-linear and delay operations.
This Presentation covers Data Mining: Classification and Prediction, NEURAL NETWORK REPRESENTATION, NEURAL NETWORK APPLICATION DEVELOPMENT, BENEFITS AND LIMITATIONS OF NEURAL NETWORKS, Neural Networks, Real Estate Appraiser, Kinds of Data Mining Problems, Data Mining Techniques, Learning in ANN, Elements of ANN, Neural Network Architectures Recurrent Neural Networks and ANN Software.
Artificial neural network for machine learninggrinu
An Artificial Neurol Network (ANN) is a computational model. It is based on the structure and functions of biological neural networks. It works like the way human brain processes information. ANN includes a large number of connected processing units that work together to process information. They also generate meaningful results from it.
Given two integer arrays val[0...n-1] and wt[0...n-1] that represents values and weights associated with n items respectively. Find out the maximum value subset of val[] such that sum of the weights of this subset is smaller than or equal to knapsack capacity W. Here the BRANCH AND BOUND ALGORITHM is discussed .
This presentation was prepared as part of the curriculum studies for CSCI-659 Topics in Artificial Intelligence Course - Machine Learning in Computational Linguistics.
It was prepared under guidance of Prof. Sandra Kubler.
hetero associative memory is a single layer neural network. However, in this network the input training vector and the output target vectors are not the same. The weights are determined so that the network stores a set of patterns. Hetero associative network is static in nature, hence, there would be no non-linear and delay operations.
This Presentation covers Data Mining: Classification and Prediction, NEURAL NETWORK REPRESENTATION, NEURAL NETWORK APPLICATION DEVELOPMENT, BENEFITS AND LIMITATIONS OF NEURAL NETWORKS, Neural Networks, Real Estate Appraiser, Kinds of Data Mining Problems, Data Mining Techniques, Learning in ANN, Elements of ANN, Neural Network Architectures Recurrent Neural Networks and ANN Software.
Artificial neural network for machine learninggrinu
An Artificial Neurol Network (ANN) is a computational model. It is based on the structure and functions of biological neural networks. It works like the way human brain processes information. ANN includes a large number of connected processing units that work together to process information. They also generate meaningful results from it.
Given two integer arrays val[0...n-1] and wt[0...n-1] that represents values and weights associated with n items respectively. Find out the maximum value subset of val[] such that sum of the weights of this subset is smaller than or equal to knapsack capacity W. Here the BRANCH AND BOUND ALGORITHM is discussed .
This presentation was prepared as part of the curriculum studies for CSCI-659 Topics in Artificial Intelligence Course - Machine Learning in Computational Linguistics.
It was prepared under guidance of Prof. Sandra Kubler.
Faster Training Algorithms in Neural Network Based Approach For Handwritten T...CSCJournals
Handwritten text and character recognition is a challenging task compared to recognition of handwritten numeral and computer printed text due to its large variety in nature. As practical pattern recognition problems uses bulk data and there is a one step self sufficient deterministic theory to resolve recognition problems by calculating inverse of Hessian Matrix and multiplication the inverse matrix it with first order local gradient vector. But in practical cases when neural network is large the inversing operation of the Hessian Matrix is not manageable and another condition must be satisfied the Hessian Matrix must be positive definite which may not be satishfied. In these cases some repetitive recursive models are taken. In several research work in past decade it was experienced that Neural Network based approach provides most reliable performance in handwritten character and text recognition but recognition performance depends upon some important factors like no of training samples, reliable features and no of features per character, training time, variety of handwriting etc. Important features from different types of handwriting are collected and are fed to the neural network for training. It is true that more no of features increases test efficiency but it takes longer time to converge the error curve. To reduce this training time effectively proper train algorithm should be chosen so that the system provides best train and test efficiency in least possible time that is to provide the system fastest intelligence. We have used several second order conjugate gradient algorithms for training of neural network. We have found that Scaled Conjugate Gradient Algorithm , a second order training algorithm as the fastest for training of neural network for our application. Training using SCG takes minimum time with excellent test efficiency. A scanned handwritten text is taken as input and character level segmentation is done. Some important and reliable features from each character are extracted and used as input to a neural network for training. When the error level reaches into a satisfactory level (10 -12 ) weights are accepted for testing a test script. Finally a lexicon matching algorithm solves the minor misclassification problems.
Implementation of Back-Propagation Neural Network using Scilab and its Conver...IJEEE
Artificial neural network has been widely used for solving non-linear complex tasks. With the development of computer technology, machine learning techniques are becoming good choice. The selection of the machine learning technique depends upon the viability for particular application. Most of the non-linear problems have been solved using back propagation based neural network. The training time of neural network is directly affected by convergence speed. Several efforts are done to improve the convergence speed of back propagation algorithm. This paper focuses on the implementation of back-propagation algorithm and an effort to improve its convergence speed. The algorithm is written in SCILAB. UCI standard data set is used for analysis purposes. Proposed modification in standard backpropagation algorithm provides substantial improvement in the convergence speed.
LightGBM and Multilayer perceptron (MLP) slideriahaque1950
LightGBM, an open-source gradient boosting framework developed by Microsoft, has garnered significant attention in the machine learning community due to its remarkable speed and efficiency. Its superiority over other boosting methods stems from several distinctive features and advantages. To understand LightGBM's effectiveness, it's essential to delve into its working process and explore how it utilizes innovative techniques to achieve unparalleled performance.
At its core, LightGBM employs an ensemble of weak learners, typically decision trees, to iteratively improve predictive accuracy. This iterative process involves continually refining the ensemble by adding new trees that rectify the errors made by previous ones. Unlike traditional gradient boosting methods, LightGBM employs a histogram-based algorithm, which efficiently bins data points, reducing memory consumption and computational overhead. This approach allows LightGBM to process large datasets with millions of instances and features swiftly.
A key factor contributing to LightGBM's speed is its leaf-wise tree growth strategy, also known as the best-first strategy. Unlike depth-wise tree growth, which splits nodes level by level, the leaf-wise strategy prioritizes nodes with the largest loss reduction, resulting in fewer overall splits and a shallower tree structure. This approach accelerates training by focusing on the most informative features and nodes, effectively reducing the computational burden.
Furthermore, LightGBM implements feature parallelism and data parallelism techniques to expedite training on multi-core CPUs and distributed computing environments. Feature parallelism involves splitting data columns among multiple threads or machines, allowing independent computation of feature histograms. On the other hand, data parallelism divides the dataset into subsets processed by different workers simultaneously. By leveraging both types of parallelism, LightGBM harnesses the full computational power of modern hardware architectures, significantly reducing training times.
Despite its impressive speed and efficiency, LightGBM is not without limitations. One notable drawback is its susceptibility to overfitting, particularly when dealing with small datasets or noisy data. The leaf-wise tree growth strategy, while effective in reducing training time, may lead to overly complex models that memorize noise in the training data. To mitigate this risk, practitioners often employ regularization techniques such as limiting the maximum depth of trees, adding dropout layers, or incorporating early stopping criteria during training.
In contrast to LightGBM's boosting approach, the multilayer perceptron (MLP) represents a different paradigm in machine learning, focusing on deep learning architectures and intricate feature representations. An MLP consists of multiple layers of interconnected neurons, including an input layer, one or more hidden layers, and an output layer.
Simulation of Single and Multilayer of Artificial Neural Network using Verilogijsrd.com
Artificial neural network play an important role in VLSI circuit to find and diagnosis multiple fault in digital circuit. In this paper, the example of single layer and multi-layer neural network had been discussed secondly implement those structure by using verilog code and same idea must be implement in mat lab for getting number of iteration and verilog code gives us time taken to adjust the weight when error become almost equal to zero. The purposed aim at reducing resource requirement, without much compromises on the speed that neural network can be realized on single chip at lower cost.
https://github.com/telecombcn-dl/dlmm-2017-dcu
Deep learning technologies are at the core of the current revolution in artificial intelligence for multimedia data analysis. The convergence of big annotated data and affordable GPU hardware has allowed the training of neural networks for data analysis tasks which had been addressed until now with hand-crafted features. Architectures such as convolutional neural networks, recurrent neural networks and Q-nets for reinforcement learning have shaped a brand new scenario in signal processing. This course will cover the basic principles and applications of deep learning to computer vision problems, such as image classification, object detection or text captioning.
Low Power High-Performance Computing on the BeagleBoard Platforma3labdsp
The ever increasing energy requirements of supercomputers and server farms is driving the scientific and industrial communities to take in deeper consideration the energy efficiency of computing equipments. This contribution addresses the issue proposing a cluster of ARM processors for high-performance computing. The cluster is composed of five BeagleBoard-xM, with one board managing the cluster, and the other boards executing the actual processing. The software platform is based on the Angstrom GNU/Linux distribution and is equipped with a distributed file system to ease sharing data and code among the nodes of the cluster, and with tools for managing tasks and monitoring the status of each node. The computational capabilities of the cluster have been assessed through High-Performance Linpack and a cluster-wide speaker diarization algorithm, while power consumption has been measured using a clamp meter. Experimental results obtained in the speaker diarization task showed that the energy efficiency of the BeagleBoard-xM cluster is comparable to the one of a laptop computer equipped with a Intel Core2 Duo T8300 running at 2.4 GHz. Furthermore, removing the bottleneck due to the Ethernet interface, the BeagleBoard-xM cluster is able to achieve a superior energy efficiency.
Bagging, also known as Bootstrap aggregating, is an ensemble learning technique that helps to improve the performance and accuracy of machine learning algorithms. It is used to deal with bias-variance trade-offs and reduces the variance of a prediction model. Bagging avoids overfitting of data and is used for both regression and classification models, specifically for decision tree algorithms.
http://imatge-upc.github.io/telecombcn-2016-dlcv/
Deep learning technologies are at the core of the current revolution in artificial intelligence for multimedia data analysis. The convergence of big annotated data and affordable GPU hardware has allowed the training of neural networks for data analysis tasks which had been addressed until now with hand-crafted features. Architectures such as convolutional neural networks, recurrent neural networks and Q-nets for reinforcement learning have shaped a brand new scenario in signal processing. This course will cover the basic principles and applications of deep learning to computer vision problems, such as image classification, object detection or text captioning.
Democratizing Fuzzing at Scale by Abhishek Aryaabh.arya
Presented at NUS: Fuzzing and Software Security Summer School 2024
This keynote talks about the democratization of fuzzing at scale, highlighting the collaboration between open source communities, academia, and industry to advance the field of fuzzing. It delves into the history of fuzzing, the development of scalable fuzzing platforms, and the empowerment of community-driven research. The talk will further discuss recent advancements leveraging AI/ML and offer insights into the future evolution of the fuzzing landscape.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
Event Management System Vb Net Project Report.pdfKamal Acharya
In present era, the scopes of information technology growing with a very fast .We do not see any are untouched from this industry. The scope of information technology has become wider includes: Business and industry. Household Business, Communication, Education, Entertainment, Science, Medicine, Engineering, Distance Learning, Weather Forecasting. Carrier Searching and so on.
My project named “Event Management System” is software that store and maintained all events coordinated in college. It also helpful to print related reports. My project will help to record the events coordinated by faculties with their Name, Event subject, date & details in an efficient & effective ways.
In my system we have to make a system by which a user can record all events coordinated by a particular faculty. In our proposed system some more featured are added which differs it from the existing system such as security.
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
Water scarcity is the lack of fresh water resources to meet the standard water demand. There are two type of water scarcity. One is physical. The other is economic water scarcity.
3. INTRODUCTION
Backpropagation, an abbreviation for "backward
propagation of errors" is a common method of
training artificial neural networks.
The method calculates the gradient of a loss
function with respects to all the weights in the network.
The gradient is fed to the optimization method which
in turn uses it to update the weights, in an attempt to
minimize the loss function.
Blackcollar4/23/2015 3
4. Backpropagation requires a known, desired output for
each input value in order to calculate the loss function
gradient.
The backpropagation learning algorithm can be
divided into two phases:
Propagation
Weight update
In Propagation neural network using the training
pattern target in order to generate the deltas of all
output and hidden neurons.
Multiply its output delta and input activation to get
the gradient of the weight.
Blackcollar4/23/2015 4
5. EXAMPLE OF BACKPROPAGATION
Inputs xi arrive
through pre-
connected path
Input is modeled
using real weights wi
The response of the
neuron is a nonlinear
function f of its
weighted inputs
Blackcollar4/23/2015 5
6. Learning is the process of modifying the weights
in order to produce a network that performs some
function.
Blackcollar4/23/2015 6
7. ALGORITHM
The following steps is the recursive definition of
algorithm:
Step:-
1.Randomly choose the initial weights.
2.For each training pattern apply the inputs to the
network.
3.Calculate the output for every neuron from the input
layer, through the hidden layer(s), to the output layer.
4.Calculate the error at the outputs:
Use the output error to compute error signals
for pre-output layers.
ErrorB= OutputB(1-OutputB) (TargetB-OutputB)
Blackcollar4/23/2015 7
8. use the error signals to compute weight
adjustments.
W+AB = WAB + (ErrorB x OutputA)
Apply the weight adjustments.
Where
W+AB is New weight and WAB is initial weight
Output(1-Output)- the Sigmoid Function .
Blackcollar4/23/2015 8
9. Advantages
Backpropagation has many advantages:-
It is fast, simple and easy to program.
It has no parameters to tune (except for the number of
input) .
This is a shift in mind set for the learning-system
designer instead of trying to design a learning algorithm
that is accurate over the entire space
It requires no prior knowledge about the weak learner
and so can be flexible.
Blackcollar4/23/2015 9
10. Disadvantages
Disadvantages are:-
The actual performance of Backpropagation on
a particular problem is clearly dependent on the
input data.
Backpropagation can be sensitive to noisy data
and outliers.
Fully matrix-based approach to backpropagation
over a mini-batch .
Blackcollar4/23/2015 10
11. Application
Mapping character strings into phonemes so they can
be pronounced by a computer.
Neural network trained how to pronounce each letter in a
word in a sentence, given the three letters before and
three letters after it in a window
In the field of Speech Recognition.
In the field of Character Recognition.
In the field of Face Recognition.
Blackcollar4/23/2015 11
12. Conclusion
The backpropagation algorithm normally
converges reasonably fast However, the actual
speed depends very much on the simulation
parameters on the initial weight values.
Blackcollar4/23/2015 12