移动深度学习
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《深度学习Deep Learning 》中文版 高清完整PDF版 下载 评分:
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上传时间:2017-04 大小:37.47MB
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2023-04-24深度学习是机器学习的一个新领域,它的出现使机器学习朝着它的原始目标——人工智能,更近了一步。深度学习会学习关于文本、图像、声音等数据的多层表示和抽象,这些表示和抽象能够帮助我们更好的理解数据。 最近以来一直在学习机器学习和算法,然后自己就在不断总结和写笔记,记录下自己的学习AI与算法历程。 机器学习(Machine Learning, ML)是一门多领域交叉学科,涉及概率论、统计学、逼近论、 凸分析、算法复杂度理论等多门学科。专门研究计算机怎样模拟或实现人类的学习行为,以获取新的知 识或技能,重新组织已有的知识结构使之不断改善自身的性能。
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2018-01-15这本书讨论这些更直观的问题一种解决方案。这种解决方案是为了让计算机从经验中学习,并通过层次化概念体系来理解世界,其中每个概念通过与较简单概念之间的联系来定义
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深度学习神经网络(英文版PDF教程)
2019-04-14书的目录 Contents Website viii Acknowledgments ix Notation xiii 1 Introduction 1 1.1 Who Should Read This Book? . . . . . . . . . . . . . . . . . . . . 8 1.2 Historical Trends in Deep Learning . . . . . . . . . . . . . . . . . 12 I Applied Math and Machine Learning Basics 27 2 Linear Algebra 29 2.1 Scalars, Vectors, Matrices and Tensors . . . . . . . . . . . . . . . 29 2.2 Multiplying Matrices and Vectors . . . . . . . . . . . . . . . . . . 32 2.3 Identity and Inverse Matrices . . . . . . . . . . . . . . . . . . . . 34 2.4 Linear Dependence and Span . . . . . . . . . . . . . . . . . . . . 35 2.5 Norms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 2.6 Special Kinds of Matrices and Vectors . . . . . . . . . . . . . . . 38 2.7 Eigendecomposition . . . . . . . . . . . . . . . . . . . . . . . . . . 40 2.8 Singular Value Decomposition . . . . . . . . . . . . . . . . . . . . 42 2.9 The Moore-Penrose Pseudoinverse . . . . . . . . . . . . . . . . . . 43 2.10 The Trace Operator . . . . . . . . . . . . . . . . . . . . . . . . . 44 2.11 The Determinant . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 2.12 Example: Principal Components Analysis . . . . . . . . . . . . . 45 3 Probability and Information Theory 51 3.1 Why Probability? . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 i CONTENTS 3.2 Random Variables . . . . . . . . . . . . . . . . . . . . . . . . . . 54 3.3 Probability Distributions . . . . . . . . . . . . . . . . . . . . . . . 54 3.4 Marginal Probability . . . . . . . . . . . . . . . . . . . . . . . . . 56 3.5 Conditional Probability . . . . . . . . . . . . . . . . . . . . . . . 57 3.6 The Chain Rule of Conditional Probabilities . . . . . . . . . . . . 57 3.7 Independence and Conditional Independence . . . . . . . . . . . . 58 3.8 Expectation, Variance and Covariance . . . . . . . . . . . . . . . 58 3.9 Common Probability Distributions . . . . . . . . . . . . . . . . . 60 3.10 Useful Properties of Common Functions . . . . . . . . . . . . . . 65 3.11 Bayes’ Rule . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 3.12 Technical Details of Continuous Variables . . . . . . . . . . . . . 69 3.13 Information Theory . . . . . . . . . . . . . . . . . . . . . . . . . . 71 3.14 Structured Probabilistic Models . . . . . . . . . . . . . . . . . . . 73 4 Numerical Computation 78 4.1 Overflow and Underflow . . . . . . . . . . . . . . . . . . . . . . . 78 4.2 Poor Conditioning . . . . . . . . . . . . . . . . . . . . . . . . . . 80 4.3 Gradient-Based Optimization . . . . . . . . . . . . . . . . . . . . 80 4.4 Constrained Optimization . . . . . . . . . . . . . . . . . . . . . . 91 4.5 Example: Linear Least Squares . . . . . . . . . . . . . . . . . . . 94 5 Machine Learning Basics 96 5.1 Learning Algorithms . . . . . . . . . . . . . . . . . . . . . . . . . 97 5.2 Capacity, Overfitting and Underfitting . . . . . . . . . . . . . . . 108 5.3 Hyperparameters and Validation Sets . . . . . . . . . . . . . . . . 118 5.4 Estimators, Bias and Variance . . . . . . . . . . . . . . . . . . . . 120 5.5 Maximum Likelihood Estimation . . . . . . . . . . . . . . . . . . 129 5.6 Bayesian Statistics . . . . . . . . . . . . . . . . . . . . . . . . . . 133 5.7 Supervised Learning Algorithms . . . . . . . . . . . . . . . . . . . 137 5.8 Unsupervised Learning Algorithms . . . . . . . . . . . . . . . . . 142 5.9 Stochastic Gradient Descent . . . . . . . . . . . . . . . . . . . . . 149 5.10 Building a Machine Learning Algorithm . . . . . . . . . . . . . . 151 5.11 Challenges Motivating Deep Learning . . . . . . . . . . . . . . . . 152 II Deep Networks: Modern Practices 162 6 Deep Feedforward Networks 164 6.1 Example: Learning XOR . . . . . . . . . . . . . . . . . . . . . . . 167 6.2 Gradient-Based Learning . . . . . . . . . . . . . . . . . . . . . . . 172 ii CONTENTS 6.3 Hidden Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187 6.4 Architecture Design . . . . . . . . . . . . . . . . . . . . . . . . . . 193 6.5 Back-Propagation and Other Differentiation Algorithms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200 6.6 Historical Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220 7 Regularization for Deep Learning 224 7.1 Parameter Norm Penalties . . . . . . . . . . . . . . . . . . . . . . 226 7.2 Norm Penalties as Constrained Optimization . . . . . . . . . . . . 233 7.3 Regularization and Under-Constrained Problems . . . . . . . . . 235 7.4 Dataset Augmentation . . . . . . . . . . . . . . . . . . . . . . . . 236 7.5 Noise Robustness . . . . . . . . . . . . . . . . . . . . . . . . . . . 238 7.6 Semi-Supervised Learning . . . . . . . . . . . . . . . . . . . . . . 240 7.7 Multitask Learning . . . . . . . . . . . . . . . . . . . . . . . . . . 241 7.8 Early Stopping . . . . . . . . . . . . . . . . . . . . . . . . . . . . 241 7.9 Parameter Tying and Parameter Sharing . . . . . . . . . . . . . . 249 7.10 Sparse Representations . . . . . . . . . . . . . . . . . . . . . . . . 251 7.11 Bagging and Other Ensemble Methods . . . . . . . . . . . . . . . 253 7.12 Dropout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 255 7.13 Adversarial Training . . . . . . . . . . . . . . . . . . . . . . . . . 265 7.14 Tangent Distance, Tangent Prop and Manifold Tangent Classifier . . . . . . . . . . . . . . . . . . . . . . . . . . . 267 8 Optimization for Training Deep Models 271 8.1 How Learning Differs from Pure Optimization . . . . . . . . . . . 272 8.2 Challenges in Neural Network Optimization . . . . . . . . . . . . 279 8.3 Basic Algorithms . . . . . . . . . . . . . . . . . . . . . . . . . . . 290 8.4 Parameter Initialization Strategies . . . . . . . . . . . . . . . . . 296 8.5 Algorithms with Adaptive Learning Rates . . . . . . . . . . . . . 302 8.6 Approximate Second-Order Methods . . . . . . . . . . . . . . . . 307 8.7 Optimization Strategies and Meta-Algorithms . . . . . . . . . . . 313 9 Convolutional Networks 326 9.1 The Convolution Operation . . . . . . . . . . . . . . . . . . . . . 327 9.2 Motivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 329 9.3 Pooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 335 9.4 Convolution and Pooling as an Infinitely Strong Prior . . . . . . . 339 9.5 Variants of the Basic Convolution Function . . . . . . . . . . . . 342 9.6 Structured Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . 352 9.7 Data Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 354 iii CONTENTS 9.8 Efficient Convolution Algorithms . . . . . . . . . . . . . . . . . . 356 9.9 Random or Unsupervised Features . . . . . . . . . . . . . . . . . 356 9.10 The Neuroscientific Basis for Convolutional Networks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 358 9.11 Convolutional Networks and the History of Deep Learning . . . . 365 10 Sequence Modeling: Recurrent and Recursive Nets 367 10.1 Unfolding Computational Graphs . . . . . . . . . . . . . . . . . . 369 10.2 Recurrent Neural Networks . . . . . . . . . . . . . . . . . . . . . 372 10.3 Bidirectional RNNs . . . . . . . . . . . . . . . . . . . . . . . . . . 388 10.4 Encoder-Decoder Sequence-to-Sequence Architectures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 390 10.5 Deep Recurrent Networks . . . . . . . . . . . . . . . . . . . . . . 392 10.6 Recursive Neural Networks . . . . . . . . . . . . . . . . . . . . . . 394 10.7 The Challenge of Long-Term Dependencies . . . . . . . . . . . . . 396 10.8 Echo State Networks . . . . . . . . . . . . . . . . . . . . . . . . . 399 10.9 Leaky Units and Other Strategies for Multiple Time Scales . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 402 10.10 The Long Short-Term Memory and Other Gated RNNs . . . . . . 404 10.11 Optimization for Long-Term Dependencies . . . . . . . . . . . . . 408 10.12 Explicit Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . 412 11 Practical Methodology 416 11.1 Performance Metrics . . . . . . . . . . . . . . . . . . . . . . . . . 417 11.2 Default Baseline Models . . . . . . . . . . . . . . . . . . . . . . . 420 11.3 Determining Whether to Gather More Data . . . . . . . . . . . . 421 11.4 Selecting Hyperparameters . . . . . . . . . . . . . . . . . . . . . . 422 11.5 Debugging Strategies . . . . . . . . . . . . . . . . . . . . . . . . . 431 11.6 Example: Multi-Digit Number Recognition . . . . . . . . . . . . . 435 12 Applications 438 12.1 Large-Scale Deep Learning . . . . . . . . . . . . . . . . . . . . . . 438 12.2 Computer Vision . . . . . . . . . . . . . . . . . . . . . . . . . . . 447 12.3 Speech Recognition . . . . . . . . . . . . . . . . . . . . . . . . . . 453 12.4 Natural Language Processing . . . . . . . . . . . . . . . . . . . . 456 12.5 Other Applications . . . . . . . . . . . . . . . . . . . . . . . . . . 473 iv CONTENTS III Deep Learning Research 482 13 Linear Factor Models 485 13.1 Probabilistic PCA and Factor Analysis . . . . . . . . . . . . . . . 486 13.2 Independent Component Analysis (ICA) . . . . . . . . . . . . . . 487 13.3 Slow Feature Analysis . . . . . . . . . . . . . . . . . . . . . . . . 489 13.4 Sparse Coding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 492 13.5 Manifold Interpretation of PCA . . . . . . . . . . . . . . . . . . . 496 14 Autoencoders 499 14.1 Undercomplete Autoencoders . . . . . . . . . . . . . . . . . . . . 500 14.2 Regularized Autoencoders . . . . . . . . . . . . . . . . . . . . . . 501 14.3 Representational Power, Layer Size and Depth . . . . . . . . . . . 505 14.4 Stochastic Encoders and Decoders . . . . . . . . . . . . . . . . . . 506 14.5 Denoising Autoencoders . . . . . . . . . . . . . . . . . . . . . . . 507 14.6 Learning Manifolds with Autoencoders . . . . . . . . . . . . . . . 513 14.7 Contractive Autoencoders . . . . . . . . . . . . . . . . . . . . . . 518 14.8 Predictive Sparse Decomposition . . . . . . . . . . . . . . . . . . 521 14.9 Applications of Autoencoders . . . . . . . . . . . . . . . . . . . . 522 15 Representation Learning 524 15.1 Greedy Layer-Wise Unsupervised Pretraining . . . . . . . . . . . 526 15.2 Transfer Learning and Domain Adaptation . . . . . . . . . . . . . 534 15.3 Semi-Supervised Disentangling of Causal Factors . . . . . . . . . 539 15.4 Distributed Representation . . . . . . . . . . . . . . . . . . . . . . 544 15.5 Exponential Gains from Depth . . . . . . . . . . . . . . . . . . . 550 15.6 Providing Clues to Discover Underlying Causes . . . . . . . . . . 552 16 Structured Probabilistic Models for Deep Learning 555 16.1 The Challenge of Unstructured Modeling . . . . . . . . . . . . . . 556 16.2 Using Graphs to Describe Model Structure . . . . . . . . . . . . . 560 16.3 Sampling from Graphical Models . . . . . . . . . . . . . . . . . . 577 16.4 Advantages of Structured Modeling . . . . . . . . . . . . . . . . . 579 16.5 Learning about Dependencies . . . . . . . . . . . . . . . . . . . . 579 16.6 Inference and Approximate Inference . . . . . . . . . . . . . . . . 580 16.7 The Deep Learning Approach to Structured Probabilistic Models . . . . . . . . . . . . . . . . . . . . . . . . . 581 17 Monte Carlo Methods 587 17.1 Sampling and Monte Carlo Methods . . . . . . . . . . . . . . . . 587 v CONTENTS 17.2 Importance Sampling . . . . . . . . . . . . . . . . . . . . . . . . . 589 17.3 Markov Chain Monte Carlo Methods . . . . . . . . . . . . . . . . 592 17.4 Gibbs Sampling . . . . . . . . . . . . . . . . . . . . . . . . . . . . 596 17.5 The Challenge of Mixing between Separated Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 597 18 Confronting the Partition Function 603 18.1 The Log-Likelihood Gradient . . . . . . . . . . . . . . . . . . . . 604 18.2 Stochastic Maximum Likelihood and Contrastive Divergence . . . 605 18.3 Pseudolikelihood . . . . . . . . . . . . . . . . . . . . . . . . . . . 613 18.4 Score Matching and Ratio Matching . . . . . . . . . . . . . . . . 615 18.5 Denoising Score Matching . . . . . . . . . . . . . . . . . . . . . . 617 18.6 Noise-Contrastive Estimation . . . . . . . . . . . . . . . . . . . . 618 18.7 Estimating the Partition Function . . . . . . . . . . . . . . . . . . 621 19 Approximate Inference 629 19.1 Inference as Optimization . . . . . . . . . . . . . . . . . . . . . . 631 19.2 Expectation Maximization . . . . . . . . . . . . . . . . . . . . . . 632 19.3 MAP Inference and Sparse Coding . . . . . . . . . . . . . . . . . 633 19.4 Variational Inference and Learning . . . . . . . . . . . . . . . . . 636 19.5 Learned Approximate Inference . . . . . . . . . . . . . . . . . . . 648 20 Deep Generative Models 651 20.1 Boltzmann Machines . . . . . . . . . . . . . . . . . . . . . . . . . 651 20.2 Restricted Boltzmann Machines . . . . . . . . . . . . . . . . . . . 653 20.3 Deep Belief Networks . . . . . . . . . . . . . . . . . . . . . . . . . 657 20.4 Deep Boltzmann Machines . . . . . . . . . . . . . . . . . . . . . . 660 20.5 Boltzmann Machines for Real-Valued Data . . . . . . . . . . . . . 673 20.6 Convolutional Boltzmann Machines . . . . . . . . . . . . . . . . . 679 20.7 Boltzmann Machines for Structured or Sequential Outputs . . . . 681 20.8 Other Boltzmann Machines . . . . . . . . . . . . . . . . . . . . . 683 20.9 Back-Propagation through Random Operations . . . . . . . . . . 684 20.10 Directed Generative Nets . . . . . . . . . . . . . . . . . . . . . . . 688 20.11 Drawing Samples from Autoencoders . . . . . . . . . . . . . . . . 707 20.12 Generative Stochastic Networks . . . . . . . . . . . . . . . . . . . 710 20.13 Other Generation Schemes . . . . . . . . . . . . . . . . . . . . . . 712 20.14 Evaluating Generative Models . . . . . . . . . . . . . . . . . . . . 713 20.15 Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 716 Bibliography 717 vi CONTENTS Index 774
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