Lecture 3: Pattern Classification

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1 EE E6820: Speech & Audio Processing & Recognition Lecture 3: Pattern Classification The problem of classification Linear and nonlinear classifiers Probabilistic classification Gaussians, mixtures and EM Methodological remarks Dan Ellis <dpwe@ee.columbia.edu> Columbia University Dept. of Electrical Engineering Spring 2003 E6820 SAPR - Dan Ellis L03 - Pattern Classification

2 1 Pattern classification Classification means: finding categorical (discrete labels for real-world (continuous observations F2/Hz 4000 f/hz time/s x x F1/Hz ay ao Why? - information extraction - conditional processing - detect exceptions E6820 SAPR - Dan Ellis L03 - Pattern Classification

3 Building a classifier Define classes/attributes - could state explicit rules - better to define through training examples Define feature space Define decision algorithm - set parameters from examples Measure performance - calculate (weighted error rate 1100 Pols vowel formants: "u" (x vs. "o" (o 1000 F2 / Hz F1 / Hz E6820 SAPR - Dan Ellis L03 - Pattern Classification

4 Classification system parts Sensor signal segment feature vector Pre-processing/ segmentation Feature extraction STFT Locate vowels Formant extraction class Classification Post-processing Context constraints Costs/risk E6820 SAPR - Dan Ellis L03 - Pattern Classification

5 Feature extraction Right features are critical - waveform vs. formants vs. cepstra - invariance under irrelevant modifications Theoretically equivalent features may act very differently in practice - representations make important aspects explicit - remove irrelevant information Feature design incorporates domain knowledge - more data less need for cleverness? Smaller feature space (fewer dimensions simpler models (fewer parameters less training data needed faster training E6820 SAPR - Dan Ellis L03 - Pattern Classification

6 Minimum distance classification Pols vowel formants: "u" (x, "o" (o, "a" ( F2 / Hz x * o new observation x F1 / Hz Find closest match (nearest neighbor min[ D( x, y ω i ], - choice of distance metric D(x,y is important Find representative match (class prototypes min[ D( x, z ω ] - class data { y ω,i } class model z ω E6820 SAPR - Dan Ellis L03 - Pattern Classification

7 2 Linear and nonlinear classifiers Minimum Euclidean distance is equivalent to a linear discriminant function: - examples { y ω,i } template z ω = mean{ y ω,i } - observed feature vector x = [x 1 x 2...] T - Euclidean distance metric Dxy [, ] = ( x y T ( x y - minimum distance rule: class i = argmin i D[ x, z i ] = argmin i D 2 [ x, z i ] - i.e. choose class O over U if D 2 [ x, z O ] < D 2 [ x, z U ]... E6820 SAPR - Dan Ellis L03 - Pattern Classification

8 Linear classifier (cont d Decision rule: Choose class O over U if: D 2 [ x, z O ] < D 2 [ x, z U ] ( x z O T ( x z O < ( x z U T ( x z U Projection x T T x + z OzO 2x T z O x T T < x + z UzU 2x T z U 2x T T T ( z O z U > z OzO z UzU Threshold ( x z U T ( z O z U > 1 -- ( z 2 O z U T ( z O z U i.e. distance from z U to x is less than half the distance to z O... E6820 SAPR - Dan Ellis L03 - Pattern Classification

9 Linear classification boundaries Min-distance divides normal to class centers: decision boundary 1 (z O -z U T (z O -z U 2 z O -z U z U x o z O (z O -z U (x-z U T (z O -z U z O -z U * x Scaling axes changes boundary: new boundary x o Squeezed horizontally x Squeezed vertically new boundary o E6820 SAPR - Dan Ellis L03 - Pattern Classification

10 Decision boundaries Linear functions give linear boundaries - planes and hyperplanes as dimensions increase Linear boundaries can become curves under feature transformations - e.g. a linear discriminant in x' = [x 2 1 x ] T What about more complex boundaries? - i.e. if a linear discriminant is how about a nonlinear function? F[ w i x i ] F[ w ij x i ] w i x i - changes only threshold space, but j i j i F[ w jk F[ w ij x i ]] offers more flexibility, and has even more... E6820 SAPR - Dan Ellis L03 - Pattern Classification

11 Neural networks Sums over nonlinear functions of sums large range of decision surfaces e.g. Multi-layer perceptron (MLP with 1 hidden layer: y k = F[ w jk F[ w ij x j i ]] j x 1 + x w 2 h jk + o 1 x F[ ] Input layer w ij + h 1 Hidden layer Problem is finding the weights w ij... (training + o2 Output layer E6820 SAPR - Dan Ellis L03 - Pattern Classification

12 Back-propagation training Find w ij to minimize e.g. E = n for training set of patterns {x n } and desired (target outputs {t n } o( x n t n Differentiate error with respect to weights: o k = F[ w jk h j j ] E w jk = = E o o Σ w jk 2( o t F' Σ w jk = w jk α j ( w jk h j [ ] h j E w jk i.e. gradient descent with learning rate α 2 E6820 SAPR - Dan Ellis L03 - Pattern Classification

13 Neural net example 2 input units (normalized F1, F2 5 hidden units, 3 output units ( U, O, A F1 F2 A O U Sigmoid nonlinearity: F[ x] 1 = e x df = F( 1 F dx sigm(x d sigm(x dx E6820 SAPR - Dan Ellis L03 - Pattern Classification

14 1 Neural net training 2:5:3 net: MS error by training epoch Mean squared error Training epoch 10 iterations iterations example E6820 SAPR - Dan Ellis L03 - Pattern Classification

15 3 Statistical Interpretation Observations are random variables whose distribution depends on the class: Observation x Class ω i (hidden discrete continuous Source distributions p(x ω i - reflect variability in feature - reflect noise in observation - generally have to be estimated from data (rather than known in advance p(x ω i p(x ω i Pr(ω i x ω 1 ω 2 ω 3 ω 4 x E6820 SAPR - Dan Ellis L03 - Pattern Classification

16 Random Variables review Random vars have joint distributions (pdf s: p(x,y y µy σ y σ xy p(y p(x µ x σ x x - marginal px ( = pxy (, dy - covariance Σ = E[ ( o µ ( o µ T ] = σ x 2 σxy σ xy σ y 2 E6820 SAPR - Dan Ellis L03 - Pattern Classification

17 Conditional probability Knowing one value in a joint distribution constrains the remainder: y Y p(x,y x p(x y = Y Bayes rule: pxy (, = pxy ( py ( pyx ( = pxy ( py ( px ( can reverse conditioning given priors/marginal - either term can be discrete or continuous E6820 SAPR - Dan Ellis L03 - Pattern Classification

18 Priors and posteriors Bayesian inference can be interpreted as updating prior beliefs with new information, x: Pr( ω i Prior probability pxω ( i pxω ( j Pr( ω j j Likelihood Evidence = p(x = Pr( ω i x Posterior probability Posterior is prior scaled by likelihood & normalized by evidence (so Σ(posteriors = 1 Objection: priors are often unknown - but omitting them amounts to assuming they are all equal E6820 SAPR - Dan Ellis L03 - Pattern Classification

19 Bayesian (MAP classifier Minimize the probability of error by choosing maximum a posteriori (MAP class: ωˆ = argmax ω i Pr( ω i x Intuitively right - choose most probable class in light of the observation Formally, expected probability of error, EPrerr [ ( ] = px ( Pr( err x dx = i X ωˆ i px ( ( 1 Pr( ω i x dx where X ωˆ is the region of X where ω i is chosen i.. but Pr(ω i x is largest in that region, so Pr(err is minimized. E6820 SAPR - Dan Ellis L03 - Pattern Classification

20 Practical implementation Optimal classifier is but we don t know ωˆ = Pr( ω i x argmax ω i Pr( ω i x Can model directly e.g. train a neural net to map from inputs x to a set of outputs Pr(ω i - a discriminative model Often easier to model conditional distributions then use Bayes rule to find MAP class pxω ( i Labeled training examples {x n,ω xn } Sort according to class Estimate conditional pdf for class ω 1 p(x ω 1 E6820 SAPR - Dan Ellis L03 - Pattern Classification

21 Likelihood models pxω ( i the search for ωˆ = argmax Pr( ω i x ω i pxω ( i Pr( ω i becomes argmax ω i pxω ( j Pr( ω j j but denominator = p(x is the same over all ω i Given models for each distribution, hence ωˆ or even = argmax ω i argmax ω i log pxω ( i Pr( ω i [ pxω ( i + logpr( ω i ] Choose parameters to maximize data likelihood, px ( train ω i E6820 SAPR - Dan Ellis L03 - Pattern Classification

22 Sources of error p(x ω 1 Pr(ω 1 X ω1 ^ X ω2 ^ p(x ω 2 Pr(ω 2 Pr(ω 2 X ω1 ^ = Pr(err X ω1 ^ x Pr(ω 1 X ω2 ^ = Pr(err X ω2 ^ Suboptimal threshold / regions (bias error - use a Bayes classifier! Incorrect distributions (model error - better distribution models/more training data Misleading features ( Bayes error - irreducible for a given feature set regardless of classification scheme E6820 SAPR - Dan Ellis L03 - Pattern Classification

23 4 Gaussian models Easiest way to model distributions is via parametric model - assume known form, estimate a few parameters Gaussian model is simple & useful: in 1 dim: pxω ( i = πσ i exp normalization to make it sum to x µ i σ i Parameters mean µ i and variance σ i 2 fit P M P M e 1/2 p(x ω i µ i σ i x E6820 SAPR - Dan Ellis L03 - Pattern Classification

24 Gaussians in d dimensions: p( x ω i = ( 2π d 1Ú 2 Σ i exp 1 -- ( x µ 2 i T 1 Σ i ( x µ i Described by d dimensional mean vector µ i and d x d covariance matrix Σ i argmax ω i Classify by maximizing log likelihood i.e ( x µ 2 i T 1 Σ i ( x µ i 1 -- log Σ 2 i + logpr( ω i E6820 SAPR - Dan Ellis L03 - Pattern Classification

25 Multivariate Gaussian covariance Eigen analysis of inverse of covariance gives 1 Σ i = ( SV T ( SV with diagonal S Λ 1 Ú 2 = exponent is 1 -- ( x µ 2 i T ( SV T ( SV ( x µ i i.e. (SV transforms x into uncorrelated, normalized-variance space x space SVx space v SV v'=svv ( x µ = Mahalanobis distance 2 i T 1 Σ i ( x µ i - Euclidean distance in normalized space example... E6820 SAPR - Dan Ellis L03 - Pattern Classification

26 Gaussian Mixture models (GMMs Single Gaussians cannot model - distributions with multiple modes - distributions with nonlinear correlation What about a weighted sum? px ( c k pxm ( k i.e. k where {c k } is a set of weights and pxm ( k { } is a set of Gaussian components - can fit anything given enough components Interpretation: each observation is generated by one of the Gaussians, chosen at random with priors c k = Pr( m k E6820 SAPR - Dan Ellis L03 - Pattern Classification

27 Gaussian mixtures (2 e.g. nonlinear correlation: resulting surface original data Gaussian components Problem: finding c k and m k parameters - easy if we knew which m k generated each x E6820 SAPR - Dan Ellis L03 - Pattern Classification

28 Expectation-maximization (EM General procedure for estimating a model when some parameters are unknown - e.g. which component generated a value in a Gaussian mixture model Procedure: Iteratively update fixed model parameters Θ to maximize Q=expected value of log-probability of known training data x trn and unknown parameters u: Q( Θ, Θ old = Pr u x trn, Θ old ( log p( u, x trn Θ u - iterative because Pr( u x trn, Θ old changes each time we change Θ - can prove this increases data likelihood, hence maximum-likelihood (ML model - local optimum - depends on initialization E6820 SAPR - Dan Ellis L03 - Pattern Classification

29 Fitting GMMs with EM Want to find component Gaussians m k { µ k, Σ k } plus weights = = c k Pr( m k to maximize likelihood of training data x trn If we could assign each x to a particular m k, estimation would be direct Hence, treat ks (mixture indices as unknown, form Q = E[ log p( x, k Θ ], differentiate with respect to model parameters equations for µ k, Σ k and c k to maximize Q... E6820 SAPR - Dan Ellis L03 - Pattern Classification

30 GMM EM update equations: Solve for maximizing Q: pkx n, Θ n µ k = pkx ( n, Θ n pkx n, Θ n Σ k = n ( x n ( ( x n µ k ( x n µ k T pkx ( n, Θ 1 c k = --- pkx N ( n, Θ n pkx ( n, Θ Each involves, fuzzy membership of x n to Gaussian k Parameter is just sample average, weighted by fuzzy membership E6820 SAPR - Dan Ellis L03 - Pattern Classification

31 GMM examples Vowel data fit with different mixture counts: 1 Gauss logp(x= Gauss logp(x= Gauss logp(x= Gauss logp(x= example... E6820 SAPR - Dan Ellis L03 - Pattern Classification

32 5 Methodological Remarks: 1: Training and test data A rich model can learn every training example (overtraining error rate Test data Training data Overfitting training or parameters But, goal is to classify new, unseen data i.e. generalization - sometimes use cross validation set to decide when to stop training For evaluation results to be meaningful: - don t test with training data! - don t train on test data (even indirectly... E6820 SAPR - Dan Ellis L03 - Pattern Classification

33 Model complexity More model parameters better fit - more Gaussian mixture components - more MLP hidden units More training data can use larger models For best generalization (no overfitting, there will be some optimal model size: More parameters Word Error Rate More training data WER% Optimal parameter/data ratio Constant training time Training set / hours Hidden layer / units WER for PLP12N-8k nets vs. net size & training data E6820 SAPR - Dan Ellis L03 - Pattern Classification

34 Model combination No single model is always best But different models have different strengths Benefits from combining several models e.g. Pr( ω = w k Pr( ω m k k Pr( ω m k where each comes from a different model / feature set and w k = Pr( m k estimates probability that model k is correct Should be able to incorporate into one model, but may be easier to combine in practice Trick is to have good estimates for w k : - static, from training data - dynamic, from test data... E6820 SAPR - Dan Ellis L03 - Pattern Classification

35 Summary Classification is making hard decisions Basis is comparison with known examples - explicitly, or via a model Probabilistic interpretation for principled decisions Ways to build models: - neural nets can learn posteriors - Gaussians can model pdfs pxω ( Pr( ω x EM allows estimation of complex models Parting thought: How do you know what s going on? E6820 SAPR - Dan Ellis L03 - Pattern Classification

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