Probabilistic machine learning: an introduction
Gespeichert in:
| Beteilige Person: | |
|---|---|
| Format: | Buch |
| Sprache: | Englisch |
| Veröffentlicht: |
Cambridge, Massachusetts ; London, England
The MIT Press
[2022]
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| Schriftenreihe: | Adaptive computation and machine learning
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| Schlagwörter: | |
| Links: | https://probml.github.io/pml-book/book1.html http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=032931010&sequence=000001&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA |
| Umfang: | xxix, 826 Seiten Illustrationen, Diagramme |
| ISBN: | 9780262046824 0262046822 |
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| 245 | 1 | 0 | |a Probabilistic machine learning |b an introduction |c Kevin P. Murphy |
| 264 | 1 | |a Cambridge, Massachusetts ; London, England |b The MIT Press |c [2022] | |
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Brief Contents 1 Introduction I 1 Foundations 29 2 Probability: Univariate Models 3 Probability: Multivariate Models 4 Statistics 103 5 Decision Theory 163 6 Information Theory 199 7 Linear Algebra 221 8 Optimization 269 II Linear Models 315 9 Linear Discriminant Analysis 10 Logistic Regression 333 11 Linear Regression 365 12 Generalized Linear Models * III 31 75 317 409 Deep Neural Networks 417 13 Neural Networks for Structured Data 14 Neural Networks for Images 461 15 Neural Networks for Sequences 497 IV Nonparametric Models 16 Exemplar-based Methods 541 17 Kernel Methods * 561 18 Trees, Forests, Bagging, and Boosting 419 539 597
BRIEF CONTENTS viii V Beyond Supervised Learning 19 Learning with Fewer Labeled Examples 20 Dimensionality Reduction 651 21 Clustering 709 22 Recommender Systems 735 23 Graph Embeddings * 747 A Notation 767 619 621
Contents Preface xxvii 1 Introduction 1.1 1.2 1.3 1.4 1.5 1.6 I 1 What is machine learning? 1 Supervised learning 1 1.2.1 Classification 2 1.2.2 Regression 8 1.2.3 Overfitting and generalization 12 1.2.4 No free lunch theorem 13 Unsupervised learning 14 1.3.1 Clustering 14 1.3.2 Discovering latent “factors of variation” 15 Self-supervised learning 16 1.3.3 1.3.4 Evaluating unsupervised learning 16 Reinforcement learning 17 Data 19 1.5.1 Some common image datasets 19 1.5.2 Some common text datasets 21 1.5.3 Preprocessing discrete input data 23 1.5.4 Preprocessing text data 24 1.5.5 Handling missing data 26 Discussion 27 1.6.1 The relationship between ML and other fields 1.6.2 Structure of the book 28 Caveats 28 1.6.3 Foundations 29 2 Probability: Univariate Models 2.1 Introduction 31 2.1.1 What is probability? 31 31 27
CONTENTS x 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 2.1.2 Types of uncertainty 31 2.1.3 Probability as an extension of logic 32 Random variables 33 2.2.1 Discrete random variables 33 2.2.2 Continuous random variables 34 2.2.3 Sets of related random variables 36 2.2.4 Independence and conditional independence 37 2.2.5 Moments of a distribution 38 2.2.6 Limitations of summary statistics * 41 Bayes’ rule 43 2.3.1 Example: Testing for COVID-19 44 2.3.2 Example: The Monty Hall problem 45 2.3.3 Inverse problems * 47 Bernoulli and binomial distributions 47 2.4.1 Definition 47 2.4.2 Sigmoid (logistic) function 48 2.4.3 Binary logistic regression 50 Categorical and multinomial distributions 51 2.5.1 Definition 51 2.5.2 Softmax function 52 2.5.3 Multiclass logistic regression 53 2.5.4 Log-sum-exp trick 54 Univariate Gaussian (normal) distribution 55 2.6.1 Cumulative distribution function 55 2.6.2 Probability density function 56 2.6.3 Regression 57 2.6.4 Why is the Gaussian distribution so widely used? 2.6.5 Dirac delta function as a limiting case 58 Some other common univariate distributions * 59 2.7.1 Student t distribution 59 2.7.2 Cauchy distribution 60 2.7.3 Laplace distribution 61 2.7.4 Beta distribution 61 2.7.5 Gamma distribution 62 2.7.6 Empirical distribution 63 Transformations of random variables * 64 2.8.1 Discrete case 64 2.8.2 Continuous case 64 2.8.3 Invertible transformations (bijections) 65 2.8.4 Moments of a linear transformation 67 2.8.5 The convolution theorem 68 2.8.6 Central limit theorem 69 2.8.7 Monte Carlo approximation 70 Exercises 71 58
CONTENTS 3 Probability: Multivariate Models 75 3.1 Joint distributions for multiple random variables 75 3.1.1 Covariance 75 3.1.2 Correlation 76 3.1.3 Uncorrelated does not imply independent 77 3.1.4 Correlation does not imply causation 77 3.1.5 Simpson’s paradox 78 3.2 The multivariate Gaussian (normal) distribution 79 3.2.1 Definition 79 3.2.2 Mahalanobis distance 81 3.2.3 Marginals and conditionals of an MVN * 82 3.2.4 Example: conditioning a 2d Gaussian 83 3.2.5 Example: Imputing missing values * 83 3.3 Linear Gaussian systems * 84 3.3.1 Bayes rule for Gaussians 85 3.3.2 Derivation * 85 3.3.3 Example: Inferring an unknown scalar 86 3.3.4 Example: inferring an unknown vector 88 3.3.5 Example: sensor fusion 89 3.4 The exponential family * 90 3.4.1 Definition 90 3.4.2 Example 91 3.4.3 Log partition function is cumulant generating function 3.4.4 Maximum entropy derivation of the exponential family 3.5 Mixture models 93 3.5.1 Gaussian mixture models 94 3.5.2 Bernoulli mixture models 95 3.6 Probabilistic graphical models * 96 3.6.1 Representation 97 3.6.2 Inference 99 3.6.3 Learning 100 3.7 Exercises 100 4 Statistics 103 4.1 Introduction 103 4.2 Maximum likelihood estimation (MLE) 103 4.2.1 Definition 103 4.2.2 Justification for MLE 104 4.2.3 Example: MLE for the Bernoulli distribution 106 4.2.4 Example: MLE for the categorical distribution 107 4.2.5 Example: MLE for the univariate Gaussian 107 4.2.6 Example: MLE for the multivariate Gaussian 108 4.2.7 Example: MLE for linear regression 110 4.3 Empirical risk minimization (ERM) 111 4.3.1 Example: minimizing the
misclassification rate 111 xi 92 92
CONTENTS xii 4.4 4.5 4.6 4.7 4.8 4.3.2 Surrogate loss 112 Other estimation methods * 112 4.4.1 The method of moments 112 4.4.2 Online (recursive) estimation 114 Regularization 116 4.5.1 Example: MAP estimation for the Bernoulli distribution 117 4.5.2 Example: MAP estimation for the multivariate Gaussian * 118 4.5.3 Example: weight decay 119 4.5.4 Picking the regularizer using a validation set 120 4.5.5 Cross-validation 121 4.5.6 Early stopping 123 4.5.7 Using more data 123 Bayesian statistics * 124 4.6.1 Conjugate priors 125 4.6.2 The beta-binomial model 125 4.6.3 The Dirichlet-multinomial model 133 4.6.4 The Gaussian-Gaussian model 137 4.6.5 Beyond conjugate priors 140 4.6.6 Credible intervals 141 4.6.7 Bayesian machine learning 143 4.6.8 Computational issues 147 Frequentisi statistics * 150 4.7.1 Sampling distributions 150 4.7.2 Gaussian approximation of the sampling distribution of the MLE 151 4.7.3 Bootstrap approximation of the sampling distribution of any estimator 4.7.4 Confidence intervals 153 4.7.5 Caution: Confidence intervals are not credible 154 4.7.6 The bias-variance tradeoff 155 Exercises 160 5 Decision Theory 163 5.1 Bayesian decision theory 163 5.1.1 Basics 163 5.1.2 Classification problems 165 5.1.3 ROC curves 167 5.1.4 Precision-recall curves 170 5.1.5 Regression problems 172 5.1.6 Probabilistic prediction problems 173 5.2 Bayesian hypothesis testing 175 5.2.1 Example: Testing if a coin is fair 176 5.2.2 Bayesian model selection 177 5.2.3 Occam’s razor 178 5.2.4 Connection between cross validation and marginal likelihood 5.2.5 Information criteria 180 5.3
Frequentisi decision theory 182 179 151
CONTENTS 5.4 5.5 5.6 xiii 5.3.1 Computing the risk of an estimator 182 5.3.2 Consistent estimators 185 5.3.3 Admissible estimators 185 Empirical risk minimization 186 5.4.1 Empirical risk 186 5.4.2 Structural risk 188 5.4.3 Cross-validation 189 5.4.4 Statistical learning theory * 189 Frequentisi hypothesis testing * 191 5.5.1 Likelihood ratio test 191 5.5.2 Null hypothesis significance testing (NHST) 5.5.3 p-values 193 5.5.4 p-values considered harmful 193 5.5.5 Why isn’t everyone a Bayesian? 195 Exercises 197 6 Information Theory 6.1 6.2 6.3 6.4 192 199 Entropy 199 6.1.1 Entropy for discrete random variables 199 6.1.2 Cross entropy 201 6.1.3 Joint entropy 201 6.1.4 Conditional entropy 202 6.1.5 Perplexity 203 6.1.6 Differential entropy for continuous random variables * Relative entropy (KL divergence) * 205 6.2.1 Definition 205 6.2.2 Interpretation 206 6.2.3 Example: KL divergence between two Gaussians 206 6.2.4 Non-negativity of KL 206 6.2.5 KL divergence and MLE 207 6.2.6 Forward vs reverse KL 208 Mutual information * 209 6.3.1 Definition 209 6.3.2 Interpretation 210 6.3.3 Example 210 6.3.4 Conditional mutual information 211 6.3.5 MI as a “generalized correlation coefficient” 212 6.3.6 Normalized mutual information 213 6.3.7 Maximal information coefficient 213 6.3.8 Data processing inequality 215 6.3.9 Sufficient Statistics 216 6.3.10 Fano’s inequality * 217 Exercises 218 7 Linear Algebra 221 204
xiv CONTENTS 7.1 7.2 7.3 7.4 7.5 7.6 7.7 7.8 Introduction 221 7.1.1 Notation 221 7.1.2 Vector spaces 224 7.1.3 Norms of a vector and matrix 226 7.1.4 Properties of a matrix 228 7.1.5 Special types of matrices 231 Matrix multiplication 234 7.2.1 Vector-vector products 234 7.2.2 Matrix-vector products 235 7.2.3 Matrix-matrix products 235 7.2.4 Application: manipulating data matrices 237 7.2.5 Kronecker products * 240 7.2.6 Einstein summation * 240 Matrix inversion 241 7.3.1 The inverse of a square matrix 241 7.3.2 Schur complements * 242 7.3.3 The matrix inversion lemma * 243 7.3.4 Matrix determinant lemma * 243 7.3.5 Application: deriving the conditionals of an MVN * 244 Eigenvalue decomposition (EVD) 245 7.4.1 Basics 245 7.4.2 Diagonalization 246 7.4.3 Eigenvalues and eigenvectors of symmetric matrices 247 7.4.4 Geometry of quadratic forms 248 7.4.5 Standardizing and whitening data 248 7.4.6 Power method 250 7.4.7 Deflation 251 7.4.8 Eigenvectors optimize quadratic forms 251 Singular value decomposition (SVD) 251 7.5.1 Basics 251 7.5.2 Connection between SVD and EVD 252 7.5.3 Pseudo inverse 253 7.5.4 SVD and the range and null space of a matrix * 254 7.5.5 Truncated SVD 256 Other matrix decompositions * 256 7.6.1 LU factorization 256 7.6.2 QR decomposition 257 7.6.3 Cholesky decomposition 258 Solving systems of linear equations * 258 7.7.1 Solving square systems 259 7.7.2 Solving underconstrained systems (least norm estimation) 259 7.7.3 Solving overconstrained systems (least squares estimation) 261 Matrix calculus 261 7.8.1 Derivatives 262 7.8.2 Gradients 262
CONTENTS 7.9 8 7.8.3 Directional derivative 263 7.8.4 Total derivative * 263 7.8.5 Jacobian 263 7.8.6 Hessian 264 7.8.7 Gradients of commonly used functions Exercises 266 xv 265 Optimization 269 8.1 Introduction 269 8.1.1 Local vs global optimization 269 8.1.2 Constrained vs unconstrained optimization 271 8.1.3 Convex vs nonconvex optimization 271 8.1.4 Smooth vs nonsmooth optimization 275 8.2 First-order methods 276 8.2.1 Descent direction 278 8.2.2 Step size (learning rate) 278 8.2.3 Convergence rates 280 8.2.4 Momentum methods 281 8.3 Second-order methods 283 8.3.1 Newton’s method 283 8.3.2 BFGS and other quasi-Newton methods 284 8.3.3 Trust region methods 285 8.4 Stochastic gradient descent 286 8.4.1 Application to finite sum problems 287 8.4.2 Example: SGD for fitting linear regression 287 8.4.3 Choosing the step size (learning rate) 288 8.4.4 Iterate averaging 291 8.4.5 Variance reduction * 291 8.4.6 Preconditioned SGD 292 8.5 Constrained optimization 295 8.5.1 Lagrange multipliers 296 8.5.2 The KKT conditions 297 8.5.3 Linear programming 299 8.5.4 Quadratic programming 300 8.5.5 Mixed integer linear programming * 301 8.6 Proximal gradient method * 301 8.6.1 Projected gradient descent 302 8.6.2 Proximal operator for fj-norm regularizer 303 8.6.3 Proximal operator for quantization 304 8.6.4 Incremental (online) proximal methods 305 8.7 Bound optimization * 306 8.7.1 The general algorithm 306 8.7.2 The EM algorithm 306 8.7.3 Example: EM for a GMM 309 8.8 Blackbox and derivative free optimization 313
CONTENTS xvi 8.9 II Exercises 314 Linear Models 315 9 Linear Discriminant Analysis 9.1 9.2 9.3 9.4 9.5 317 Introduction 317 Gaussian discriminant analysis 317 9.2.1 Quadratic decision boundaries 318 9.2.2 Linear decision boundaries 319 9.2.3 The connection between LDA andlogistic regression 319 9.2.4 Model fitting 320 9.2.5 Nearest centroid classifier 322 9.2.6 Fisher’s linear discriminant analysis * 322 Naive Bayes classifiers 326 9.3.1 Example models 326 9.3.2 Model fitting 327 9.3.3 Bayesian naive Bayes 328 9.3.4 The connection between naive Bayes and logistic regression Generative vs discriminative classifiers 330 9.4.1 Advantages of discriminative classifiers 330 9.4.2 Advantages of generative classifiers 331 9.4.3 Handling missing features 331 Exercises 332 10 Logistic Regression 333 10.1 Introduction 333 10.2 Binary logistic regression 333 10.2.1 Linear classifiers 333 10.2.2 Nonlinear classifiers 334 10.2.3 Maximum likelihood estimation 336 10.2.4 Stochastic gradient descent 339 10.2.5 Perceptron algorithm 340 10.2.6 Iteratively reweighted least squares 340 10.2.7 MAP estimation 342 10.2.8 Standardization 343 10.3 Multinomial logistic regression 344 10.3.1 Linear and nonlinear classifiers 345 10.3.2 Maximum likelihood estimation 345 10.3.3 Gradient-based optimization 347 10.3.4 Bound optimization 347 10.3.5 MAP estimation 349 10.3.6 Maximum entropy classifiers 350 10.3.7 Hierarchical classification 351 10.3.8 Handling large numbers of classes 352 329
CONTENTS 10.4 Robust logistic regression * 353 10.4.1 Mixture model for the likelihood 353 10.4.2 Bi-tempered loss 354 357 10.5 Bayesian logistic regression * 10.5.1 Laplace approximation 357 10.5.2 Approximating the posterior predictive 10.6 Exercises 361 xvii 358 11 Linear Regression 365 11.1 Introduction 365 11.2 Least squares linear regression 365 11.2.1 Terminology 365 11.2.2 Least squares estimation 366 11.2.3 Other approaches to computing the MLE 370 11.2.4 Measuring goodness of fit 374 11.3 Ridge regression 375 11.3.1 Computing the MAP estimate 376 11.3.2 Connection between ridge regression and PCA 377 11.3.3 Choosing the strength of the regularizer 378 11.4 Lasso regression 379 11.4.1 MAP estimation with a Laplace prior (Ą regularization) 379 11.4.2 Why does ¿i regularization yield sparse solutions? 380 11.4.3 Hard vs soft thresholding 381 11.4.4 Regularization path 383 11.4.5 Comparison of least squares, lasso, ridge and subset selection 384 11.4.6 Variable selection consistency 386 11.4.7 Group lasso 387 11.4.8 Elastic net (ridge and lasso combined) 390 11.4.9 Optimization algorithms 391 11.5 Regression splines * 393 11.5.1 B-spline basis functions 393 11.5.2 Fitting a linear model using a spline basis 395 11.5.3 Smoothing splines 395 11.5.4 Generalized additive models 395 11.6 Robust linear regression * 396 11.6.1 Laplace likelihood 396 11.6.2 Student-t likelihood 398 11.6.3 Huber loss 398 11.6.4 RANSAC 398 11.7 Bayesian linear regression * 399 11.7.1 Priors 399 11.7.2 Posteriors 399 11.7.3 Example 400 11.7.4 Computing the posterior predictive 400 11.7.5 The
advantage of centering 402
CONTENTS xviii 11.7.6 Dealing with multicollinearity 403 11.7.7 Automatic relevancy determination (ARD) * 11.8 Exercises 405 12 Generalized Linear Models * 404 409 12.1 Introduction 409 12.2 Examples 409 12.2.1 Linear regression 410 12.2.2 Binomial regression 410 12.2.3 Poisson regression 411 12.3 GLMs with non-canonical link functions 411 12.4 Maximum likelihood estimation 412 12.5 Worked example: predicting insurance claims 413 III Deep Neural Networks 417 13 Neural Networks for Structured Data 419 13.1 Introduction 419 13.2 Multilayer perceptrons (MLPs) 420 13.2.1 The XOR problem 421 13.2.2 Differentiable MLPs 422 13.2.3 Activation functions 422 13.2.4 Example models 423 13.2.5 The importance of depth 428 13.2.6 The “deep learning revolution” 429 13.2.7 Connections with biology 429 13.3 Backpropagation 432 13.3.1 Forward vs reverse mode differentiation 432 13.3.2 Reverse mode differentiation for multilayer perceptrons 13.3.3 Vector-Jacobian product for common layers 436 13.3.4 Computation graphs 438 13.4 Training neural networks 440 13.4.1 Tuning the learning rate 441 13.4.2 Vanishing and exploding gradients 441 13.4.3 Non-saturating activation functions 442 13.4.4 Residual connections 445 13.4.5 Parameter initialization 446 13.4.6 Parallel training 447 13.5 Regularization 448 13.5.1 Early stopping 448 13.5.2 Weight decay 449 13.5.3 Sparse DNNs 449 13.5.4 Dropout 449 13.5.5 Bayesian neural networks 451 434
CONTENTS 13.5.6 Regularization effects of (stochastic) gradient descent * 13.6 Other kinds of feedforward networks * 453 13.6.1 Radial basis function networks 453 13.6.2 Mixtures of experts 454 13.7 Exercises 457 14 Neural Networks for Images 461 14.1 Introduction 461 14.2 Common layers 462 14.2.1 Convolutional layers 462 14.2.2 Pooling layers 469 14.2.3 Putting it all together 470 14.2.4 Normalization layers 470 14.3 Common architectures for image classification 473 14.3.1 LeNet 473 14.3.2 AlexNet 475 14.3.3 GoogLeNet (Inception) 476 14.3.4 ResNet 477 14.3.5 DenseNet 478 14.3.6 Neural architecture search 479 14.4 Other forms of convolution * 479 14.4.1 Dilated convolution 479 14.4.2 Transposed convolution 481 14.4.3 Depthwise separable convolution 482 14.5 Solving other discriminative vision tasks with CNNs * 482 14.5.1 Image tagging 483 14.5.2 Object detection 483 14.5.3 Instance segmentation 484 14.5.4 Semantic segmentation 484 14.5.5 Human pose estimation 486 14.6 Generating images by inverting CNNs * 487 14.6.1 Converting a trained classifier into a generative model 14.6.2 Image priors 488 14.6.3 Visualizing the features learned by a CNN 490 14.6.4 Deep Dream 490 14.6.5 Neural style transfer 491 15 Neural Networks for Sequences 497 15.1 Introduction 497 15.2 Recurrent neural networks (RNNs) 497 15.2.1 Vec2Seq (sequence generation) 497 15.2.2 Seq2Vec (sequence classification) 500 15.2.3 Seq2Seq (sequence translation) 501 15.2.4 Teacher forcing 503 15.2.5 Backpropagation through time 504 xix 451 487
CONTENTS XX 15.3 15.4 15.5 15.6 15.7 IV 505 15.2.6 Vanishing and exploding gradients 506 15.2.7 Gating and long term memory 509 15.2.8 Beam search Id CNNs 510 510 15.3.1 Id CNNs for sequence classification 511 15.3.2 Causal Id CNNs for sequence generation Attention 512 513 15.4.1 Attention as soft dictionary lookup 514 15.4.2 Kernel regression as non-parametric attention 514 15.4.3 Parametric attention 515 15.4.4 Seq2Seq with attention 518 15.4.5 Seq2vec with attention (text classification) 518 15.4.6 Seq+Seq2Vec with attention (text pair classification) 519 15.4.7 Soft vs hard attention Transformers 520 520 15.5.1 Self-attention 521 15.5.2 Multi-headed attention 522 15.5.3 Positional encoding 523 15.5.4 Putting it all together 525 15.5.5 Comparing transformers, CNNs and RNNs 526 15.5.6 Transformers for images * 526 15.5.7 Other transformer variants * Efficient transformers * 527 527 15.6.1 Fixed non-learnable localized attention patterns 528 15.6.2 Learnable sparse attention patterns 529 15.6.3 Memory and recurrence methods 529 15.6.4 Low-rank and kernel methods Language models and unsupervised representation learning 531 531 15.7.1 ELMo 532 15.7.2 BERT 536 15.7.3 GPT 15.7.4 T5 536 537 15.7.5 Discussion Nonparametric Models 539 16 Exemplar-based Methods 541 16.1 К nearest neighbor (KNN) classification 541 542 16.1.1 Example 542 16.1.2 The curse of dimensionality 16.1.3 Reducing the speed and memory requirements 544 16.1.4 Open set recognition 16.2 Learning distance metrics 545 16.2.1 Linear and convex methods 546 544
CONTENTS 16.2.2 16.2.3 16.2.4 16.2.5 16.2.6 16.3 Kernel 16.3.1 16.3.2 16.3.3 16.3.4 16.3.5 xxi Deep metric learning 548 Classification losses 548 Ranking losses 549 Speeding up ranking loss optimization 550 Other training tricks for DML 553 density estimation (KDE) 554 Density kernels 554 Parzen window density estimator 555 How to choose the bandwidth parameter 556 Rom KDE to KNN classification 557 Kernel regression 557 17 Kernel Methods * 561 17.1 Mercer kernels 561 17.1.1 Mercer’s theorem 562 17.1.2 Some popular Mercer kernels 563 17.2 Gaussian processes 568 17.2.1 Noise-free observations 568 17.2.2 Noisy observations 569 17.2.3 Comparison to kernel regression 570 17.2.4 Weight space vs function space 571 17.2.5 Numerical issues 571 17.2.6 Estimating the kernel 572 17.2.7 GPs for classification 575 17.2.8 Connections with deep learning 576 17.2.9 Scaling GPs to large datasets 577 17.3 Support vector machines (SVMs) 579 17.3.1 Large margin classifiers 579 17.3.2 The dual problem 581 17.3.3 Soft margin classifiers 583 17.3.4 The kernel trick 584 17.3.5 Converting SVM outputs into probabilities 585 17.3.6 Connection with logistic regression 585 17.3.7 Multi-class classification with SVMs 586 17.3.8 How to choose the regularizer C 587 17.3.9 Kernel ridge regression 588 17.3.10 SVMs for regression 589 17.4 Sparse vector machines 591 17.4.1 Relevance vector machines (RVMs) 592 17.4.2 Comparison of sparse and dense kernel methods 592 17.5 Exercises 595 18 Trees, Forests, Bagging, and Boosting 597 18.1 Classification and regression trees (CART) 597 18.1.1 Model definition 597
CONTENTS xxii 18.2 18.3 18.4 18.5 18.6 V 18.1.2 Model fitting 599 18.1.3 Regularization 600 18.1.4 Handling missing input features 600 18.1.5 Pros and cons 600 Ensemble learning 602 18.2.1 Stacking 602 18.2.2 Ensembling is not Bayes model averaging 603 Bagging 603 Random forests 604 Boosting 605 18.5.1 Forward stagewise additive modeling 606 18.5.2 Quadratic loss and least squares boosting 606 18.5.3 Exponential loss and AdaBoost 607 18.5.4 LogitBoost 610 18.5.5 Gradient boosting 610 Interpreting tree ensembles 614 18.6.1 Feature importance 615 18.6.2 Partial dependency plots 617 Beyond Supervised Learning 19 Learning with Fewer Labeled Examples 619 621 19.1 Data augmentation 621 19.1.1 Examples 621 19.1.2 Theoretical justification 622 19.2 Transfer learning 622 19.2.1 Fine-tuning 623 19.2.2 Adapters 624 19.2.3 Supervised pre-training 625 19.2.4 Unsupervised pre-training (self-supervised learning) 626 19.2.5 Domain adaptation 631 19.3 Semi-supervised learning 632 19.3.1 Self-training and pseudo-labeling 632 19.3.2 Entropy minimization 633 19.3.3 Co-training 636 19.3.4 Label propagation on graphs 637 19.3.5 Consistency regularization 638 19.3.6 Deep generative models * 640 19.3.7 Combining self-supervised and semi-supervised learning 643 19.4 Active learning 644 19.4.1 Decision-theoretic approach 644 19.4.2 Information-theoretic approach 644 19.4.3 Batch active learning 645 19.5 Meta-learning 645
CONTENTS 19.5.1 Model-agnostic meta-learning (MAML) 19.6 Few-shot learning 647 19.6.1 Matching networks 648 19.7 Weakly supervised learning 649 19.8 Exercises 649 xxiii 646 20 Dimensionality Reduction 651 20.1 Principal components analysis (PCA) 651 20.1.1 Examples 651 20.1.2 Derivation of the algorithm 653 20.1.3 Computational issues 656 20.1.4 Choosing the number of latent dimensions 658 20.2 Factor analysis * 660 20.2.1 Generative model 661 20.2.2 Probabilistic PCA 662 20.2.3 EM algorithm for FA/PPCA 663 20.2.4 Unidentifiability of the parameters 665 20.2.5 Nonlinear factor analysis 667 20.2.6 Mixtures of factor analysers 668 20.2.7 Exponential family factor analysis 669 20.2.8 Factor analysis models for paired data 670 20.3 Autoencoders 673 20.3.1 Bottleneck autoencoders 674 20.3.2 Denoising autoencoders 676 20.3.3 Contractive autoencoders 676 20.3.4 Sparse autoencoders 677 20.3.5 Variational autoencoders 677 20.4 Manifold learning * 682 20.4.1 What are manifolds? 683 20.4.2 The manifold hypothesis 683 20.4.3 Approaches to manifold learning 684 20.4.4 Multi-dimensional scaling (MDS) 685 20.4.5 Isomap 688 20.4.6 Kernel PCA 689 20.4.7 Maximum variance unfolding (MVU) 691 20.4.8 Local linear embedding (LLE) 691 20.4.9 Laplacian eigenmaps 692 20.4.10 t-SNE 695 20.5 Word embeddings 699 20.5.1 Latent semantic analysis / indexing 699 20.5.2 Word2vec 701 20.5.3 GloVE 703 20.5.4 Word analogies 704 20.5.5 RAND-WALK model of word embeddings 705 20.5.6 Contextual word embeddings 705
xxiv 20.6 Exercises 21 Clustering CONTENTS 706 709 21.1 Introduction 709 21.1.1 Evaluating the output of clustering methods 709 21.2 Hierarchical agglomerative clustering 711 21.2.1 The algorithm 712 21.2.2 Example 714 21.2.3 Extensions 715 21.3 К means clustering 716 21.3.1 The algorithm 716 21.3.2 Examples 716 21.3.3 Vector quantization 718 21.3.4 The K-means++ algorithm 719 21.3.5 The K-medoids algorithm 719 21.3.6 Speedup tricks 720 21.3.7 Choosing the number of clusters К 720 21.4 Clustering using mixture models 723 21.4.1 Mixtures of Gaussians 724 21.4.2 Mixtures of Bernoullis 727 21.5 Spectral clustering * 728 21.5.1 Normalized cuts 728 21.5.2 Eigenvectors of the graph Laplacian encode the clustering 21.5.3 Example 730 21.5.4 Connection with other methods 731 21.6 Biclustering * 731 21.6.1 Basic biclustering 732 21.6.2 Nested partition models (Crosscat) 732 22 Recommender Systems 735 22.1 Explicit feedback 735 22.1.1 Datasets 735 22.1.2 Collaborative filtering 736 22.1.3 Matrix factorization 737 22.1.4 Autoencoders 739 22.2 Implicit feedback 741 22.2.1 Bayesian personalized ranking 741 22.2.2 Factorization machines 742 22.2.3 Neural matrix factorization 743 22.3 Leveraging side information 743 22.4 Exploration-exploitation tradeoff 744 23 Graph Embeddings * 747 23.1 Introduction 747 23.2 Graph Embedding as an Encoder/Decoder Problem 748 729
xxv CONTENTS 23.3 Shallow graph embeddings 750 23.3.1 Unsupervised embeddings 751 23.3.2 Distance-based: Euclidean methods 751 23.3.3 Distance-based: non-Euclidean methods 752 23.3.4 Outer product-based: Matrix factorization methods 23.3.5 Outer product-based: Skip-gram methods 753 23.3.6 Supervised embeddings 755 23.4 Graph Neural Networks 756 756 23.4.1 Message passing GNNs 23.4.2 Spectral Graph Convolutions 757 23.4.3 Spatial Graph Convolutions 757 759 23.4.4 Non-Euclidean Graph Convolutions 759 23.5 Deep graph embeddings 23.5.1 Unsupervised embeddings 760 23.5.2 Semi-supervised embeddings 762 763 23.6 Applications 23.6.1 Unsupervised applications 763 23.6.2 Supervised applications 765 Notation A.l A.2 A.3 A.4 A.5 A.6 A.7 A.8 A.9 Index 767 Introduction 767 Common mathematical symbols 767 Functions 768 768 Common functions of one argument A.3.1 768 Common functions of two arguments A.3.2 768 Common functions of 2 arguments A.3.3 Linear algebra 769 General notation 769 A.4.1 Vectors 769 A.4.2 Matrices 769 A.4.3 Matrix calculus 770 A.4.4 Optimization 770 Probability 771 Information theory 771 Statistics and machine learning 772 A.8.1 Supervised learning 772 A.8.2 Unsupervised learning and generative models A.8.3 Bayesian inference 772 Abbreviations 773 775 Bibliography 793 772 752 |
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| author | Murphy, Kevin P. 1970- |
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| dewey-search | 006.31 |
| dewey-sort | 16.31 |
| dewey-tens | 000 - Computer science, information, general works |
| discipline | Informatik Mathematik |
| format | Book |
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| illustrated | Illustrated |
| indexdate | 2025-02-24T09:01:24Z |
| institution | BVB |
| isbn | 9780262046824 0262046822 |
| language | English |
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| physical | xxix, 826 Seiten Illustrationen, Diagramme |
| psigel | ebook |
| publishDate | 2022 |
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| publisher | The MIT Press |
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| series2 | Adaptive computation and machine learning |
| spellingShingle | Murphy, Kevin P. 1970- Probabilistic machine learning an introduction Wahrscheinlichkeitstheorie (DE-588)4079013-7 gnd Maschinelles Lernen (DE-588)4193754-5 gnd |
| subject_GND | (DE-588)4079013-7 (DE-588)4193754-5 |
| title | Probabilistic machine learning an introduction |
| title_auth | Probabilistic machine learning an introduction |
| title_exact_search | Probabilistic machine learning an introduction |
| title_full | Probabilistic machine learning an introduction Kevin P. Murphy |
| title_fullStr | Probabilistic machine learning an introduction Kevin P. Murphy |
| title_full_unstemmed | Probabilistic machine learning an introduction Kevin P. Murphy |
| title_short | Probabilistic machine learning |
| title_sort | probabilistic machine learning an introduction |
| title_sub | an introduction |
| topic | Wahrscheinlichkeitstheorie (DE-588)4079013-7 gnd Maschinelles Lernen (DE-588)4193754-5 gnd |
| topic_facet | Wahrscheinlichkeitstheorie Maschinelles Lernen |
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| work_keys_str_mv | AT murphykevinp probabilisticmachinelearninganintroduction |
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