L5 Support Vector Classification
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1 L5 Support Vector Classification Support Vector Machine Problem definition Geometrical picture Optimization problem Optimization Problem Hard margin Convexity Dual problem Soft margin problem Alexander J. Smola: An Introduction to Machine Learning 3 / 1
2 Classification Data Pairs of observations (x i, y i ) generated from some distribution P(x, y), e.g., (blood status, cancer), (credit transaction, fraud), (profile of jet engine, defect) Task Estimate y given x at a new location. Modification: find a function f (x) that does the task. Alexander J. Smola: An Introduction to Machine Learning 4 / 1
3 So Many Solutions Alexander J. Smola: An Introduction to Machine Learning 5 / 1
4 One to rule them all... Alexander J. Smola: An Introduction to Machine Learning 6 / 1
5 Optimal Separating Hyperplane Alexander J. Smola: An Introduction to Machine Learning 7 / 1
6 Optimization Problem Margin to Norm Separation of sets is given by 2 kwk Equivalently minimize 1kwk. 2 Equivalently minimize 1 2 kwk2. Constraints Separation with margin, i.e. so maximize that. hw, x i i + b 1 if y i = 1 hw, x i i + b apple 1 if y i = 1 Equivalent constraint y i (hw, x i i + b) 1 Alexander J. Smola: An Introduction to Machine Learning 8 / 1
7 Optimization Problem Mathematical Programming Setting Combining the above requirements we obtain 1 minimize 2 kwk2 subject to y i (hw, x i i + b) 1 0 for all 1 apple i apple m Properties Problem is convex Hence it has unique minimum Efficient algorithms for solving it exist Alexander J. Smola: An Introduction to Machine Learning 9 / 1
8 Lagrange Function Objective Function 1 2 kwk2. Constraints c i (w, b) := 1 y i (hw, x i i + b) apple 0 Lagrange Function L(w, b, ) = PrimalObjective + X i i c i = 1 2 kwk2 + mx i (1 i=1 y i (hw, x i i + b)) Saddle Point Condition Derivatives of L with respect to w and b must vanish. Alexander J. Smola: An Introduction to Machine Learning 10 / 1
9 Saddle Point of z = x2 y2
10 Support Vector Machines Optimization Problem minimize 1 2 subject to mx i j y i y j hx i, x j i i,j=1 mx i=1 mx i y i = 0 and i 0 i=1 Support Vector Expansion w = X i y i x i and hence f (x) = i Kuhn Tucker Conditions i mx i y i hx i, xi + b i=1 i (1 y i (hx i, xi + b)) = 0 Alexander J. Smola: An Introduction to Machine Learning 11 / 1
11 Proof (optional) Lagrange Function L(w, b, ) = 1 2 kwk2 + mx i (1 i=1 y i (hw, x i i + b)) Saddlepoint w L(w, b, ) b L(w, b, ) = mx i y i x i = 0 () w = i=1 mx i y i x i = 0 () i=1 mx i y i x i i=1 mx i y i = 0 To obtain the dual optimization problem we have to substitute the values of w and b into L. Note that the dual variables i have the constraint i 0. Alexander J. Smola: An Introduction to Machine Learning 12 / 1 i=1
12 Proof (optional) Dual Optimization Problem After substituting in terms for b, w the Lagrange function becomes subject to 1 2 mx i j y i y j hx i, x j i + i,j=1 mx i y i = 0 and i i=1 mx i=1 i 0 for all 1 apple i apple m Practical Modification Need to maximize dual objective function. Rewrite as minimize 1 mx mx i j y i y j hx i, x j i i 2 i,j=1 subject to the above constraints. Alexander J. Smola: An Introduction to Machine Learning 13 / 1 i=1
13 Support Vector Expansion Solution in w = mx i y i x i i=1 w is given by a linear combination of training patterns x i. Independent of the dimensionality of x. w depends on the Lagrange multipliers i. Kuhn-Tucker-Conditions At optimal solution Constraint Lagrange Multiplier = 0 In our context this means Equivalently we have i (1 y i (hw, x i i + b)) = 0. i 6= 0 =) y i (hw, x i i + b) =1 Only points at the decision boundary can contribute to the solution. Alexander J. Smola: An Introduction to Machine Learning 14 / 1
14 Mini Summary Linear Classification Many solutions Optimal separating hyperplane Optimization problem Support Vector Machines Quadratic problem Lagrange function Dual problem Interpretation Dual variables and SVs SV expansion Hard margin and infinite weights Alexander J. Smola: An Introduction to Machine Learning 15 / 1
15 Kernels Nonlinearity via Feature Maps Replace x i by (x i ) in the optimization problem. Equivalent optimization problem minimize 1 mx mx i j y i y j k(x i, x j ) 2 subject to i,j=1 mx i y i = 0 and i 0 i=1 Decision Function mx w = i y i (x i ) implies i=1 f (x) =hw, (x)i + b = i=1 Alexander J. Smola: An Introduction to Machine Learning 16 / 1 i=1 i mx i y i k(x i, x)+b.
16 Examples and Problems Advantage Works well when the data is noise free. Problem Already a single wrong observation can ruin everything we require y i f (x i ) 1 for all i. Idea Limit the influence of individual observations by making the constraints less stringent (introduce slacks). Alexander J. Smola: An Introduction to Machine Learning 17 / 1
17 Support Vector Machines Three main ideas: 1. Define what an optimal hyperplane is (in way that can be identified in a computationally efficient way): maximize margin 2. Extend the above definition for non-linearly separable problems: have a penalty term for misclassifications 3. Map data to high dimensional space where it is easier to classify with linear decision surfaces: reformulate problem so that data is mapped implicitly to this space 217
18 Non-Linearly Separable Data Var 1 i Introduce slack variables i w i w x b 1 Allow some instances to fall within the margin, but penalize them w x b w x b 0 Var 2 218
19 Formulating the Optimization Problem Constraint becomes : Var 1 i y ( w x b) 1, x 0 i i i i i w i w x b w x w x b 1 Var 2 b 0 Objective function penalizes for misclassified instances and those within the margin 1 min 2 C trades-off margin width and misclassifications w C i i
20 Linear, Soft-Margin SVMs 1 min 2 2 w C i i y ( w x b) 1, x i i i i 0 i Algorithm tries to maintain i to zero while maximizing margin Notice: algorithm does not minimize the number of misclassifications (NP-complete problem) but the sum of distances from the margin hyperplanes Other formulations use i 2 instead As C, we get closer to the hard-margin solution 220
21 Robustness of Soft vs Hard Margin SVMs Var 1 Var 1 i i w x b 0 Soft Margin SVN Var 2 w x b 0 Hard Margin SVN Var 2 221
22 Soft vs Hard Margin SVM Soft-Margin always have a solution Soft-Margin is more robust to outliers Smoother surfaces (in the non-linear case) Hard-Margin does not require to guess the cost parameter (requires no parameters at all) 222
23 Optimization Problem (Soft Margin) Recall: Hard Margin Problem Softening the Constraints minimize 1 minimize 2 kwk2 subject to y i (hw, x i i + b) kwk2 + C mx i=1 subject to y i (hw, x i i + b) 1+ i 0 and i 0 i Alexander J. Smola: An Introduction to Machine Learning 18 / 1
24 Linear SVM C = 1 Alexander J. Smola: An Introduction to Machine Learning 26 / 1
25 Linear SVM C = 2 Alexander J. Smola: An Introduction to Machine Learning 27 / 1
26 Linear SVM C = 5 Alexander J. Smola: An Introduction to Machine Learning 28 / 1
27 Linear SVM C = 10 Alexander J. Smola: An Introduction to Machine Learning 29 / 1
28 Linear SVM C = 20 Alexander J. Smola: An Introduction to Machine Learning 30 / 1
29 Linear SVM C = 50 Alexander J. Smola: An Introduction to Machine Learning 31 / 1
30 Linear SVM C = 100 Alexander J. Smola: An Introduction to Machine Learning 32 / 1
31 Linear SVM C = 1 Alexander J. Smola: An Introduction to Machine Learning 40 / 1
32 Linear SVM C = 2 Alexander J. Smola: An Introduction to Machine Learning 41 / 1
33 Linear SVM C = 5 Alexander J. Smola: An Introduction to Machine Learning 42 / 1
34 Linear SVM C = 10 Alexander J. Smola: An Introduction to Machine Learning 43 / 1
35 Linear SVM C = 20 Alexander J. Smola: An Introduction to Machine Learning 44 / 1
36 Linear SVM C = 50 Alexander J. Smola: An Introduction to Machine Learning 45 / 1
37 Linear SVM C = 100 Alexander J. Smola: An Introduction to Machine Learning 46 / 1
38 Insights Changing C For clean data C doesn t matter much. For noisy data, large C leads to narrow margin (SVM tries to do a good job at separating, even though it isn t possible) Noisy data Clean data has few support vectors Noisy data leads to data in the margins More support vectors for noisy data Alexander J. Smola: An Introduction to Machine Learning 47 / 1
39 Dual Optimization Problem Optimization Problem minimize 1 2 subject to mx i j y i y j k(x i, x j ) i,j=1 mx i=1 mx i y i = 0 and C i 0 for all 1 apple i apple m i=1 Interpretation Almost same optimization problem as before Constraint on weight of each i (bounds influence of pattern). Efficient solvers exist (more about that tomorrow). i Alexander J. Smola: An Introduction to Machine Learning 49 / 1
40 SV Classification Machine Alexander J. Smola: An Introduction to Machine Learning 50 / 1
41 Gaussian RBF with C = 0.1 Alexander J. Smola: An Introduction to Machine Learning 51 / 1
42 Gaussian RBF with C = 0.2 Alexander J. Smola: An Introduction to Machine Learning 52 / 1
43 Gaussian RBF with C = 0.4 Alexander J. Smola: An Introduction to Machine Learning 53 / 1
44 Gaussian RBF with C = 0.8 Alexander J. Smola: An Introduction to Machine Learning 54 / 1
45 Gaussian RBF with C = 1.6 Alexander J. Smola: An Introduction to Machine Learning 55 / 1
46 Gaussian RBF with C = 3.2 Alexander J. Smola: An Introduction to Machine Learning 56 / 1
47 Gaussian RBF with C = 6.4 Alexander J. Smola: An Introduction to Machine Learning 57 / 1
48 Gaussian RBF with C = 12.8 Alexander J. Smola: An Introduction to Machine Learning 58 / 1
49 Summary Support Vector Machine Problem definition Geometrical picture Optimization problem Optimization Problem Hard margin Convexity Dual problem Soft margin problem Alexander J. Smola: An Introduction to Machine Learning 77 / 1
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