From Last Meeting. Studied Fisher Linear Discrimination. - Mathematics. - Point Cloud view. - Likelihood view. - Toy examples
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1 From Last Meeting Studied Fisher Linear Discrimination - Mathematics - Point Cloud view - Likelihood view - Toy eamples - Etensions (e.g. Principal Discriminant Analysis)
2 Polynomial Embedding Aizerman, Braverman and Rozoner (964) Automation and Remote Control, 5, Motivating idea: etend scope of linear discrimination, by adding nonlinear components to data (better use of name nonlinear discrimination????) E.g. In d, linear separation splits the domain Show PolyEmbed/PolyEmbedd.mpg into only 2 parts { : R}
3 Polynomial Embedding (cont.) But in the quadratic embedded domain {( 2 ) : } 2, R R linear separation can give 3 parts Show PolyEmbed/PolyEmbed2d.mpg - original data space lies in d manifold - very sparse region of 2 R - curvature of manifold gives better linear separation - can have any 2 break points (2 points line)
4 Polynomial Embedding (cont.) Stronger effects for higher order polynomial embedding: E.g. for cubic, {( 2 3 ) } 3,, : R R Show PolyEmbed/PolyEmbed3d.mpg linear separation can give 4 parts (or fewer) - original space lies in d manifold, even sparser in 3 R - higher d curvature gives improved linear separation - can have any 3 break points (3 points plane)? - relatively few interesting separating planes
5 Polynomial Embedding (cont.) General View: for original data matri: dn d n! "! add rows :!!!! "!! n n dn d n dn d n
6 Polynomial Embedding (cont.) Fisher Linear Discrimination: Choose Class for 0 when: ( () (2) ) ( () (2) ) X X X X ( X () X (2) ) w + Σ 0t ˆ w ˆ Σ in embedded space. 2 - image of class boundaries in original space is nonlinear - allows much more complicated class regions - can also do Gaussian Likelihood Ratio (or others)
7 Polynomial Embedding Toy Eamples E.g. : Parallel Clouds Show PolyEmbed\PEodRaw.ps - PC always bad (finds embedded greatest var. only) show PolyEmbed\PEodPCcombine.pdf - FLD stays good show PolyEmbed\PEodFLDcombine.pdf - GLR OK discrimination at data, but overfitting problems show PolyEmbed\PEodGLRcombine.pdf
8 Polynomial Embedding Toy Eamples (cont.) E.g. 2: Two Clouds Show PolyEmbed\PEtclRaw.ps - FLD good, generally improves with higher degree show PolyEmbed\PEtclFLDcombine.pdf - GLR mostly good, some overfitting show PolyEmbed\PEtclGLRcombine.pdf 2 2 -, 2,, 2, 2 similar in shape to,??? 2
9 Polynomial Embedding Toy Eamples (cont.) E.g. 3: Split X Show PolyEmbed\PEed3Raw.ps - FLD rapidly improves with higher degree show PolyEmbed\Ped3FLDcombine.pdf - GLR always good, but never ellipse around blues? show PolyEmbed\Ped3GLRcombine.pdf - Should apply ICA first? Show HDLSS\HDLSSd3ICA.ps
10 Polynomial Embedding Toy Eamples (cont.) E.g. 4: Split X, parallel to Aes Show PolyEmbed\Ped4Raw.ps - FLD fine with more embedding show PolyEmbed\Ped4FLDcombine.pdf - GLR OK for all, no overfitting. show PolyEmbed\Ped4LGLRcombine.pdf - never found ellipse (maybe hyperbola is right?) - ICA helped FLD (better for lower degree).
11 Polynomial Embedding Toy Eamples (cont.) E.g. 5: Donut Show PolyEmbed\PEdonRaw.ps - FLD: poor for low degree, then good, no overfit Show PolyEmbed\ PEdonFLDcombine.pdf - GLR: best with no embed, square shape for overfitting? Show PolyEmbed\ PEdonGLRcombine.pdf
12 Polynomial Embedding Toy Eamples (cont.) E.g. 6: Target Show PolyEmbed\PEtarRaw.ps - Similar lessons Show PolyEmbed\PEtarFLDcombine.pdf, PolyEmbed\PEtarGLRcombine.pdf - Hoped for better performance from cubic
13 Polynomial Embedding (cont.) Drawback to polynomial embedding: - too many etra terms create spurious structure - i.e. have overfitting - High Dimension Low Sample Size problems worse
14 Kernel Machines Idea: replace polynomials by other nonlinear functions e.g. : sigmoid functions from neural nets e.g. 2: radial basis functions Gaussian kernels Related to kernel density estimation (smoothed histogram) Show SiZer\EGkdeCombined.pdf
15 Kernel Machines (cont.) Radial basis functions: at some grid points k g g,...,, For a bandwidth (i.e. standard deviation) σ, Consider (d dim al) functions: ( ) ( ) k g g σ σ ϕ ϕ,..., Replace data matri with: ( ) ( ) ( ) ( ) k n k n g X g X g X g X σ σ σ σ ϕ ϕ ϕ ϕ! "!
16 Kernel Machines (cont.) For discrimination: work in radial basis function domain, With new data vector X 0 represented by: ϕ ϕ σ σ ( X g ) 0! ( X g ) 0
17 Kernel Machines (cont.) Toy Eamples: E.g. : Parallel Clouds good at data, poor outside Show PolyEmbed\PEodFLDe7.ps E.g. 2: Two Clouds Similar result Show PolyEmbed\PEtclFLDe7.ps E.g. 3: Split X OK at data, strange outside Show PolyEmbed\Ped3FLDe7.ps
18 Kernel Machines (cont.) E.g. 4: Split X, parallel to Aes similar ideas Show PolyEmbed\Ped4FLDe7.ps E.g. 5: Donut mostly good (slight mistake for one kernel) Show PolyEmbed\PedonFLDe7.ps E.g. 6: Target much better than other eamples Show PolyEmbed\PetarFLDe7.ps Main lesson: generally good in regions with data, unpredictable results where data are sparse
19 Kernel Machines (cont.) E.g. 7: Checkerboard Show PolyEmbed\PechbRaw.ps - Kernel embedding is ecellent Show PolyEmbed\PechbFLDe7.ps - Other polynomials lack fleibility Show PolyEmbed\PEchbFLDcombine.pdf and PolyEmbed\PEchbGLRcombine.pdf - Lower degree is worse
20
21 Kernel Machines (cont.) Note: Gaussian Likelihood Ratio had frequent numerical failure Important point for kernel machines: High Dimension Low Sample Size problems get worse This is motivation for Support Vector Machines
22 Kernel Machines (cont.) generalizations of this idea to other types of analysis, and some clever computational ideas. E.g. Kernel based, nonlinear Principal Components Analysis Schölkopf, Smola and Müller (998) Nonlinear component analysis as a kernel eigenvalue problem, Neural Computation, 0,
23 Classical References: Support Vector Machines Vapnik (982) Estimation of dependences based on empirical data, Springer (Russian version, 979) Boser, Guyon & Vapnik (992) in Fifth Annual Workshop on Computational Learning Theory, ACM. Vapnik (995) The nature of statistical learning theory, Springer. Recommended tutorial: Burges (998) A tutorial on support vector machines for pattern recognition, Data Mining and Knowledge Discovery, 2, , see also web site:
24 Support Vector Machines (cont.) Motivation: High Dimension Low Sample Size discrimination (e.g. from doing a nonlinear embedding) a tendency towards major over-fitting problems Toy Eample: In st dimension: Class : (2,0.8) N 2,0.8 ( n = 20 of each, and threw in 4 outliers ) N Class 2: ( ) In dimensions 2,..., d : independent N(0,) Show Svm\SVMeg3pd2mv.mpg
25 Support Vector Machines (cont.) Toy Eample: for linear discrimination: Top: Proj n onto (2-d) subspace generated by st unit vector (- -) and Discrimination direction vector (----) (shows angle) For reproducible (over new data sets) discrimination : Want these near each other, i.e. small angle Bottom: -d projections, and smoothed histograms
26 Support Vector Machines (cont.) Lessons from Fisher Linear Discrimination Toy Eample: - Great angle for d =, but substantial overlap - OK angle for d = 2,..., 0, still significant overlap - Angle gets very bad for d =,..., 8, but overlap declines - No overlap for d 23 (perfect discrimination!?!?) - Completely nonreproducible (with new data) - Thus useless for real discrimination
27 Support Vector Machines (cont.) Main Goal of Support Vector Machines: Achieve a trade off between: Discrimination quality for data at hand vs. Reproducibility with new data Approaches:. Regularization (bound on generaliz n, via compleity ) 2. Quadratic Programming (general n of Linear Prog.)
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