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Neural networks
1.
DATA WARE HOUSING
AND DATA MINING NEURAL NETWORKS
2.
Contents
Neural Networks NN Node NN Activation Functions NN Learning NN Advantages NN Disadvantages
3.
Neural Networks 3
Based on observed functioning of human brain. (Artificial Neural Networks (ANN) Our view of neural networks is very simplistic. We view a neural network (NN) from a graphical viewpoint. Alternatively, a NN may be viewed from the perspective of matrices. Used in pattern recognition, speech recognition, computer vision, and classification. © Prentice Hall
4.
Neural Networks 4
Neural Network (NN) is a directed graph F=<V,A> with vertices V={1,2,…,n} and arcs A={<i,j>|1<=i,j<=n}, with the following restrictions: V is partitioned into a set of input nodes, VI, hidden nodes, VH, and output nodes, VO. The vertices are also partitioned into layers Any arc <i,j> must have node i in layer h-1 and node j in layer h. Arc <i,j> is labeled with a numeric value wij. Node i is labeled with a function fi. © Prentice Hall
5.
Neural Network Example 5
© Prentice Hall
6.
NN Activation Functions 6
Functions associated with nodes in graph. Output may be in range [-1,1] or [0,1] © Prentice Hall
7.
NN Activation Functions 7
© Prentice Hall
8.
NN Learning 8
Propagate input values through graph. Compare output to desired output. Adjust weights in graph accordingly. © Prentice Hall
9.
Neural Networks 9
A Neural Network Model is a computational model consisting of three parts: Neural Network graph Learning algorithm that indicates how learning takes place. Recall techniques that determine hew information is obtained from the network. We will look at propagation as the recall technique. © Prentice Hall
10.
NN Advantages 10
Learning Can continue learning even after training set has been applied. Easy parallelization Solves many problems © Prentice Hall
11.
NN Disadvantages 11
Difficult to understand May suffer from overfitting Structure of graph must be determined a priori. Input values must be numeric. Verification difficult. © Prentice Hall
12.
Applications of Neural 12
Networks Prediction – weather, stocks, disease Classification – financial risk assessment, image processing Data association – Text Recognition (OCR) Data conceptualization – Customer purchasing habits Filtering – Normalizing telephone signals (static)
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