Deep Learning Quick Reference

图书信息

作者	Mike Bernico
出版社	Packt Publishing
ISBN	9781788838917
出版时间	2018-03-09
字数	32.8万
分类	进口书,外文原版书,电脑,网络

读书简介

Dive deeper into neural networks and get your models trained, optimized with this quick reference guide About This Book ? A quick reference to all important deep learning concepts and their implementations ? Essential tips, tricks, and hacks to train a variety of deep learning models such as CNNs, RNNs, LSTMs, and more ? Supplemented with essential mathematics and theory, every chapter provides best practices and safe choices for training and fine-tuning your models in Keras and Tensorflow. Who This Book Is For If you are a Data Scientist or a Machine Learning expert, then this book is a very useful read in training your advanced machine learning and deep learning models. You can also refer this book if you are stuck in-between the neural network modeling and need immediate assistance in getting accomplishing the task smoothly. Some prior knowledge of Python and tight hold on the basics of machine learning is required. What You Will Learn ? Solve regression and classification challenges with TensorFlow and Keras ? Learn to use Tensor Board for monitoring neural networks and its training ? Optimize hyperparameters and safe choices/best practices ? Build CNN's, RNN's, and LSTM's and using word embedding from scratch ? Build and train seq2seq models for machine translation and chat applications. ? Understanding Deep Q networks and how to use one to solve an autonomous agent problem. ? Explore Deep Q Network and address autonomous agent challenges. In Detail Deep learning has become an essential necessity to enter the world of artificial intelligence. With this book deep learning techniques will become more accessible, practical, and relevant to practicing data scientists. It moves deep learning from academia to the real world through practical examples. You will learn how Tensor Board is used to monitor the training of deep neural networks and solve binary classification problems using deep learning. Readers will then learn to optimize hyperparameters in their deep learning models. The book then takes the readers through the practical implementation of training CNN's, RNN's, and LSTM's with word embeddings and seq2seq models from scratch. Later the book explores advanced topics such as Deep Q Network to solve an autonomous agent problem and how to use two adversarial networks to generate artificial images that appear real. For implementation purposes, we look at popular Python-based deep learning frameworks such as Keras and Tensorflow, Each chapter provides best practices and safe choices to help readers make the right decision while training deep neural networks. By the end of this book, you will be able to solve real-world problems quickly with deep neural networks. Style and approach An easy-to-follow, step-by-step guide to help you get to grips with real-world applications of training deep neural networks.

目录

Title Page

Copyright and Credits

Deep Learning Quick Reference

Dedication

Packt Upsell

Why subscribe?

PacktPub.com

Foreword

Contributors

About the author

About the reviewer

Packt is searching for authors like you

Preface

Who this book is for

What this book covers

To get the most out of this book

Download the example code files

Conventions used

Get in touch

Reviews

The Building Blocks of Deep Learning

The deep neural network architectures

Neurons

The neuron linear function

Neuron activation functions

The loss and cost functions in deep learning

The forward propagation process

The back propagation function

Stochastic and minibatch gradient descents

Optimization algorithms for deep learning

Using momentum with gradient descent

The RMSProp algorithm

The Adam optimizer

Deep learning frameworks

What is TensorFlow?

What is Keras?

Popular alternatives to TensorFlow

GPU requirements for TensorFlow and Keras

Installing Nvidia CUDA Toolkit and cuDNN

Installing Python

Installing TensorFlow and Keras

Building datasets for deep learning

Bias and variance errors in deep learning

The train, val, and test datasets

Managing bias and variance in deep neural networks

K-Fold cross-validation

Summary

Using Deep Learning to Solve Regression Problems

Regression analysis and deep neural networks

Benefits of using a neural network for regression

Drawbacks to consider when using a neural network for regression

Using deep neural networks for regression

How to plan a machine learning problem

Defining our example problem

Loading the dataset

Defining our cost function

Building an MLP in Keras

Input layer shape

Hidden layer shape

Output layer shape

Neural network architecture

Training the Keras model

Measuring the performance of our model

Building a deep neural network in Keras

Measuring the deep neural network performance

Tuning the model hyperparameters

Saving and loading a trained Keras model

Summary

Monitoring Network Training Using TensorBoard

A brief overview of TensorBoard

Setting up TensorBoard

Installing TensorBoard

How TensorBoard talks to Keras/TensorFlow

Running TensorBoard

Connecting Keras to TensorBoard

Introducing Keras callbacks

Creating a TensorBoard callback

Using TensorBoard

Visualizing training

Visualizing network graphs

Visualizing a broken network

Summary

Using Deep Learning to Solve Binary Classification Problems

Binary classification and deep neural networks

Benefits of deep neural networks

Drawbacks of deep neural networks

Case study – epileptic seizure recognition

Defining our dataset

Loading data

Model inputs and outputs

The cost function

Using metrics to assess the performance

Building a binary classifier in Keras

The input layer

The hidden layers

What happens if we use too many neurons?

What happens if we use too few neurons?

Choosing a hidden layer architecture

Coding the hidden layers for our example

The output layer

Putting it all together

Training our model

Using the checkpoint callback in Keras

Measuring ROC AUC in a custom callback

Measuring precision, recall, and f1-score

Summary

Using Keras to Solve Multiclass Classification Problems

Multiclass classification and deep neural networks

Benefits

Drawbacks

Case study - handwritten digit classification

Problem definition

Model inputs and outputs

Flattening inputs

Categorical outputs

Cost function

Metrics

Building a multiclass classifier in Keras

Loading MNIST

Input layer

Hidden layers

Output layer

Softmax activation

Putting it all together

Training

Using scikit-learn metrics with multiclass models

Controlling variance with dropout

Controlling variance with regularization

Summary

Hyperparameter Optimization

Should network architecture be considered a hyperparameter?

Finding a giant and then standing on his shoulders

Adding until you overfit, then regularizing

Practical advice

Which hyperparameters should we optimize?

Hyperparameter optimization strategies

Common strategies

Using random search with scikit-learn

Hyperband

Summary

Training a CNN from Scratch

Introducing convolutions

How do convolutional layers work?

Convolutions in three dimensions

A layer of convolutions

Benefits of convolutional layers

Parameter sharing

Local connectivity

Pooling layers

Batch normalization

Training a convolutional neural network in Keras

Input

Output

Cost function and metrics

Convolutional layers

Fully connected layers

Multi-GPU models in Keras

Training

Using data augmentation

The Keras ImageDataGenerator

Training with a generator

Summary

Transfer Learning with Pretrained CNNs

Overview of transfer learning

When transfer learning should be used

Limited data

Common problem domains

The impact of source/target volume and similarity

More data is always beneficial

Source/target domain similarity

Transfer learning in Keras

Target domain overview

Source domain overview

Source network architecture

Transfer network architecture

Data preparation

Data input

Training (feature extraction)

Training (fine-tuning)

Summary

Training an RNN from scratch

Introducing recurrent neural networks

What makes a neuron recurrent?

Long Short Term Memory Networks

Backpropagation through time

A refresher on time series problems

Stock and flow

ARIMA and ARIMAX forecasting

Using an LSTM for time series prediction

Data preparation

Loading the dataset

Slicing train and test by date

Differencing a time series

Scaling a time series

Creating a lagged training set

Input shape

Data preparation glue

Network output

Network architecture

Stateful versus stateless LSTMs

Training

Measuring performance

Summary

Training LSTMs with Word Embeddings from Scratch

An introduction to natural language processing

Semantic analysis

Document classification

Vectorizing text

NLP terminology

Bag of Word models

Stemming, lemmatization, and stopwords

Count and TF-IDF vectorization

Word embedding

A quick example

Learning word embeddings with prediction

Learning word embeddings with counting

Getting from words to documents

Keras embedding layer

1D CNNs for natural language processing

Case studies for document classifications

Sentiment analysis with Keras embedding layers and LSTMs

Preparing the data

Input and embedding layer architecture

LSTM layer

Output layer

Putting it all together

Training the network

Performance

Document classification with and without GloVe

Preparing the data

Loading pretrained word vectors

Input and embedding layer architecture

Without GloVe vectors

With GloVe vectors

Convolution layers

Output layer

Putting it all together

Training

Performance

Summary

Training Seq2Seq Models

Sequence-to-sequence models

Sequence-to-sequence model applications

Sequence-to-sequence model architecture

Encoders and decoders

Characters versus words

Teacher forcing

Attention

Translation metrics

Machine translation

Understanding the data

Loading data

One hot encoding

Training network architecture

Network architecture (for inference)

Putting it all together

Training

Inference

Loading data

Creating reverse indices

Loading models

Translating a sequence

Decoding a sequence

Example translations

Summary

Using Deep Reinforcement Learning

Reinforcement learning overview

Markov Decision Processes

Q Learning

Infinite state space

Deep Q networks

Online learning

Memory and experience replay

Exploitation versus exploration

DeepMind

The Keras reinforcement learning framework

Installing Keras-RL

Installing OpenAI gym

Using OpenAI gym

Building a reinforcement learning agent in Keras

CartPole

CartPole neural network architecture

Memory

Policy

Agent

Training

Results

Lunar Lander

Lunar Lander network architecture

Memory and policy

Agent

Training

Results

Summary

Generative Adversarial Networks

An overview of the GAN

Deep Convolutional GAN architecture

Adversarial training architecture

Generator architecture

Discriminator architecture

Stacked training

Step 1 – train the discriminator

Step 2 – train the stack

How GANs can fail

Stability

Mode collapse

Safe choices for GAN

Generating MNIST images using a Keras GAN

Loading the dataset

Building the generator

Building the discriminator

Building the stacked model

The training loop

Model evaluation

Generating CIFAR-10 images using a Keras GAN

Loading CIFAR-10

Building the generator

Building the discriminator

The training loop

Model evaluation

Summary

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