Neural Networks and Support Vector Machines

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1 INF Kunstig intelligens Neural Networks and Support Vector Machines Roar Fjellheim INF Neural Networks and SVM 1

2 Outline Neural networks Perceptrons Neural networks Support vector machines Summary AIMA Chapter 18: Learning from Examples INF Neural Networks and SVM 2

3 Neural networks in AI The human brain is a huge network of neurons A neuron is a basic processing unit that collects, processes and disseminates electrical signals Early AI tried to imitate the brain by building artificial neural networks (ANN) Met with theoretical limits and disappeared In the es, interest in ANNs resurfaced New theoretical development Massive industrial interest&applications INF Neural Networks and SVM 3

4 The basic unit of neural networks The network consists of units (nodes, neurons ) connected by links Carries an activation a i from unit i to unit j The link from unit i to unit j has a weight W i,j Bias weight W 0,j to fixed input a 0 = 1 Activation of a unit j Calculate input in j = W i,j a i (i=0..n) Derive output a j = g(in j ) where g is the activation function INF Neural Networks and SVM 4

5 Activation functions Activation function should separate well Active (near 1) for desired input Inactive (near 0) otherwise It should be non-linear Most used functions Threshold function Sigmoid function INF Neural Networks and SVM 5

6 Neural networks as logical gates With proper use of bias weight W 0 to set thresholds, neural networks can compute standard logical gate functions INF Neural Networks and SVM 6

7 Neural network structures Two main structures Feed-forward (acyclic) networks Represents a function of its inputs No internal state Recurrent network Feeds outputs back to inputs May be stable, oscillate or become chaotic Output depends on initial state Recurrent networks are the most interesting and brain-like, but also most difficult to understand INF Neural Networks and SVM 7

8 Feed-forward networks as functions A FF network calculates a function of its inputs The network may contain hidden units/layers By changing #layers/units and their weights, different functions can be realized FF networks are often used for classification INF Neural Networks and SVM 8

9 Perceptrons Single-layer feed-forward neural networks are called perceptrons, and were the earliest networks to be studied Perceptrons can only act as linear separators, a small subset of all interesting functions This partly explains why neural network research was discontinued for a long time INF Neural Networks and SVM 9

10 Perceptron learning algorithm How to train the network to do a certain function (e.g. classification) based on a training set of input/output pairs? x 1 W j x 2 y x 3 Basic idea x 4 Adjust network link weights to minimize some measure of the error on the training set Adjust weights in direction that minimizes error INF Neural Networks and SVM 10

11 Perceptron learning algorithm (cont.) function PERCEPTRON-LEARNING(examples, network) returns a perceptron hypothesis inputs: examples, a set of examples, each with inputs x 1, x 2.. and output y repeat network, a perceptron with weights W j and act. function g for each e in examples do in = W j x j [e] Err = y[e] g(in) W j = W j + Err x j [e] until some stopping criterion is satisfied j=0.. n return NEURAL-NETWORK-HYPOTHESIS(network) - the learning rate INF Neural Networks and SVM 11

12 Performance of perceptrons vs. decision trees Perceptrons better at learning separable problem Decision trees better at restaurant problem INF Neural Networks and SVM 12

13 Multi-layer feed-forward networks Adds hidden layers The most common is one extra layer The advantage is that more function can be realized, in effect by combining several perceptron functions It can be shown that A feed-forward network with a single sufficiently large hidden layer can represent any continuous function With two layers, even discontinuous functions can be represented However Cannot easily tell which functions a particular network is able to represent Not well understood how to choose structure/number of layers for a particular problem INF Neural Networks and SVM 13

14 Example network structure Feed-forward network with 10 inputs, one output and one hidden layer suitable for restaurant problem INF Neural Networks and SVM 14

15 More complex activation functions Multi-layer networks can combine simple (linear separation) perceptron activation functions into more complex functions (combine 2) (combine 2) INF Neural Networks and SVM 15

16 Learning in multi-layer networks In principle as for perceptrons adjusting weights to minimize error The main difference is what error at internal nodes mean nothing to compare to Solution: Propagate error at output nodes back to hidden layers Successively propagate backwards if the network has several hidden layers The resulting Back-propagation algorithm is the standard learning method for neural networks INF Neural Networks and SVM 16

17 Learning neural network structure Need to learn network structure Learning algorithms have assumed fixed network structure However, we do not know in advance what structure will be necessary and sufficient Solution approach Try different configurations, keep the best Search space is very large (# layers and # nodes) Optimal brain damage : Start with full network, remove nodes selectively (optimally) Tiling : Start with minimal network that covers subset of training set, expand incrementally INF Neural Networks and SVM 17

18 Support Vector Machines (SVM) Currently the most popular approach for supervised learning Does not require any prior knowledge Scales to very large problems Attractive features of SVM Constructs a maximum margin separator, decision boundary with max. possible distance to examples Creates linear separators, but can embed data in higher dimensions (kernel trick) A non-parametric method, i.e. may retain examples (instances, in addition to parameters as in NN), thus be able to express more complex functions INF Neural Networks and SVM 18

19 Classification by SVM SVM finds the separator with maximum margin between examples The example points nearest the separator are called support vectors INF Neural Networks and SVM 19

20 The kernel trick in SVM What if the examples are not linearly separable? SVM maps each example to a new vector in a higher dimension space, using kernel functions In the new space, a linear maximum separator may be found (the kernel trick) INF Neural Networks and SVM 20

21 Ensemble learning (EM) In ensemble learning predictions from a collection of hypotheses are combined Example: Three linear separators are combined such that all separators must return positive for the overall classification to be positive The combined classifier is more expressive without being much more complex Boosting is a widely used ensemble learning method INF Neural Networks and SVM 21

22 Summary Neural networks (NN) are inspired by human brains, and are complex nonlinear functions with many parameters learned from noisy data A perceptron is a feed-forward network with no hidden layers and can only represent linearly separable functions Multi-layer feed-forward NN can represent arbitrary functions, and be trained efficiently using the back-propagation algorithm Support vector machines (SVM) is an effective method for learning classifiers in large data sets Ensemble learning (EM) combines several simpler classifiers in a more complex function INF Neural Networks and SVM 22

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