ECE 5424: Introduction to Machine Learning
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1 ECE 5424: Introduction to Machine Learning Topics: SVM Multi-class SVMs Neural Networks Multi-layer Perceptron Readings: Barber 17.5, Murphy 16.5 Stefan Lee Virginia Tech
2 HW2 Graded Mean 63/61 = 103% Max: 76 Min: 20 (C) Dhruv Batra 2
3 Administrativia HW3 Due: Nov 7 th 11:55PM You will implement primal & dual SVMs Kaggle competition: Higgs Boson Signal vs Background classification (C) Dhruv Batra 3
4 Administrativia (C) Dhruv Batra 4
5 Recap of Last Time (C) Dhruv Batra 5
6 Linear classifiers Which line is better? w.x = j w (j) x (j) 6
7 Dual SVM derivation (1) the linearly separable case (C) Dhruv Batra Slide Credit: Carlos Guestrin 7
8 Dual SVM derivation (1) the linearly separable case (C) Dhruv Batra Slide Credit: Carlos Guestrin 8
9 Dual SVM formulation the linearly separable case (C) Dhruv Batra Slide Credit: Carlos Guestrin 9
10 Dual SVM formulation the non-separable case (C) Dhruv Batra Slide Credit: Carlos Guestrin 10
11 Dual SVM formulation the non-separable case (C) Dhruv Batra Slide Credit: Carlos Guestrin 11
12 Why did we learn about the dual SVM? Builds character! Exposes structure about the problem There are some quadratic programming algorithms that can solve the dual faster than the primal The kernel trick!!! (C) Dhruv Batra Slide Credit: Carlos Guestrin 12
13 Dual SVM interpretation: Sparsity (C) Dhruv Batra Slide Credit: Carlos Guestrin 13
14 Dual formulation only depends on dot-products, not on w! (C) Dhruv Batra 14
15 Polynomials of degree d Common kernels Polynomials of degree up to d Gaussian kernel / Radial Basis Function 2 Sigmoid (C) Dhruv Batra Slide Credit: Carlos Guestrin 15
16 Plan for Today SVMs Multi-class Neural Networks (C) Dhruv Batra 16
17 What about multiple classes? (C) Dhruv Batra Slide Credit: Carlos Guestrin 17
18 One against All (Rest) y2 Not y2 Learn N classifiers: y1 Not y1 Noty3 y3 (C) Dhruv Batra Slide Credit: Carlos Guestrin 18
19 One against One y2 y1 y1 Learn N-choose-2 classifiers: y3 y2 y3 (C) Dhruv Batra Slide Credit: Carlos Guestrin 19
20 Problems C 1 C 3? R 1 R 1 R 2? R 3 C 1 C 2 C 1 R 3 C 2 R 2 Not C 1 Not C 2 C 2 C 3 (C) Dhruv Batra Image Credit: Kevin Murphy 20
21 Learn 1 classifier: Multiclass SVM Simultaneously learn 3 sets of weights (C) Dhruv Batra Slide Credit: Carlos Guestrin 21
22 Learn 1 classifier: Multiclass SVM (C) Dhruv Batra Slide Credit: Carlos Guestrin 22
23 Addressing non-linearly separable data Option 1, non-linear features Choose non-linear features, e.g., Typical linear features: w 0 + i w i x i Example of non-linear features: Degree 2 polynomials, w 0 + i w i x i + ij w ij x i x j Classifier h w (x) still linear in parameters w As easy to learn Data is linearly separable in higher dimensional spaces Express via kernels (C) Dhruv Batra Slide Credit: Carlos Guestrin 23
24 Addressing non-linearly separable data Option 2, non-linear classifier Choose a classifier h w (x) that is non-linear in parameters w, e.g., Decision trees, neural networks, More general than linear classifiers But, can often be harder to learn (non-convex optimization required) Often very useful (outperforms linear classifiers) In a way, both ideas are related (C) Dhruv Batra Slide Credit: Carlos Guestrin 24
25 New Topic: Neural Networks (C) Dhruv Batra 25
26 Synonyms Neural Networks Artificial Neural Network (ANN) Feed-forward Networks Multilayer Perceptrons (MLP) Types of ANN Convolutional Nets Autoencoders Recurrent Neural Nets [Back with a new name]: Deep Nets / Deep Learning (C) Dhruv Batra 26
27 Biological Neuron (C) Dhruv Batra 27
28 Artificial Neuron Perceptron (with step function) Logistic Regression (with sigmoid) (C) Dhruv Batra 28
29 Sigmoid w 0 =2, w 1 =1 w 0 =0, w 1 =1 w 0 =0, w 1 = (C) Dhruv Batra Slide Credit: Carlos Guestrin 29
30 Many possible response functions Linear Sigmoid Exponential Gaussian
31 Limitation A single neuron is still a linear decision boundary What to do? (C) Dhruv Batra 31
32 (C) Dhruv Batra 32
33 Limitation A single neuron is still a linear decision boundary What to do? Idea: Stack a bunch of them together! (C) Dhruv Batra 33
34 Hidden layer 1-hidden layer feed-forward network: On board (C) Dhruv Batra 34
35 Neural Nets Best performers on OCR NetTalk Text to Speech system from Rick Rashid speaks Mandarin (C) Dhruv Batra 35
36 Universal Function Approximators Theorem 3-layer network with linear outputs can uniformly approximate any continuous function to arbitrary accuracy, given enough hidden units [Funahashi 89] (C) Dhruv Batra 36
37 Neural Networks Demo (C) Dhruv Batra 37
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