Book Image

Neural Networks with Keras Cookbook

By : V Kishore Ayyadevara
Book Image

Neural Networks with Keras Cookbook

By: V Kishore Ayyadevara

Overview of this book

This book will take you from the basics of neural networks to advanced implementations of architectures using a recipe-based approach. We will learn about how neural networks work and the impact of various hyper parameters on a network's accuracy along with leveraging neural networks for structured and unstructured data. Later, we will learn how to classify and detect objects in images. We will also learn to use transfer learning for multiple applications, including a self-driving car using Convolutional Neural Networks. We will generate images while leveraging GANs and also by performing image encoding. Additionally, we will perform text analysis using word vector based techniques. Later, we will use Recurrent Neural Networks and LSTM to implement chatbot and Machine Translation systems. Finally, you will learn about transcribing images, audio, and generating captions and also use Deep Q-learning to build an agent that plays Space Invaders game. By the end of this book, you will have developed the skills to choose and customize multiple neural network architectures for various deep learning problems you might encounter.

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Table of Contents (18 chapters)
Preface
Preface
Who this book is for
What this book covers
To get the most out of this book
Sections
Get in touch
Free Chapter
1
Building a Feedforward Neural Network
Building a Feedforward Neural Network
Introduction
Architecture of a simple neural network
Applications of a neural network
Feed-forward propagation from scratch in Python
Building back-propagation from scratch in Python
Building a neural network in Keras
2
Building a Deep Feedforward Neural Network
Building a Deep Feedforward Neural Network
Training a vanilla neural network
Scaling the input dataset
Impact on training when the majority of inputs are greater than zero
Impact of batch size on model accuracy
Building a deep neural network to improve network accuracy
Varying the learning rate to improve network accuracy
Varying the loss optimizer to improve network accuracy
Understanding the scenario of overfitting
Speeding up the training process using batch normalization
3
Applications of Deep Feedforward Neural Networks
Applications of Deep Feedforward Neural Networks
Introduction
Predicting credit default
Assigning weights for classes
Predicting house prices
Categorizing news articles into topics
Classifying common audio
Stock price prediction
Leveraging a functional API
Defining weights for rows
4
Building a Deep Convolutional Neural Network
Building a Deep Convolutional Neural Network
Introduction
Inaccuracy of traditional neural networks when images are translated
Building a CNN from scratch using Python
CNNs to improve accuracy in the case of image translation
Gender classification using CNNs
Data augmentation to improve network accuracy
5
Transfer Learning
Transfer Learning
Gender classification of the person in an image using CNNs
Gender classification of the person in image using the VGG16 architecture-based model
Visualizing the output of the intermediate layers of a neural network
Gender classification of the person in image using the VGG19 architecture-based model
Gender classification using the Inception v3 architecture-based model
Gender classification of the person in image using the ResNet 50 architecture-based model
Detecting the key points within image of a face
6
Detecting and Localizing Objects in Images
Detecting and Localizing Objects in Images
Introduction
Creating the dataset for a bounding box
Generating region proposals within an image, using selective search
Calculating an intersection over a union between two images
Detecting objects, using region proposal-based CNN
Performing non-max suppression
Detecting a person using an anchor box-based algorithm
7
Image Analysis Applications in Self-Driving Cars
Image Analysis Applications in Self-Driving Cars
Traffic sign identification
Predicting the angle within which a car needs to be turned
Instance segmentation using the U-net architecture
Semantic segmentation of objects in an image
8
Image Generation
Image Generation
Introduction
Generating images that can fool a neural network using adversarial attack
DeepDream algorithm to generate images
Neural style transfer between images
Generating images of digits using Generative Adversarial Networks
Generating images using a Deep Convolutional GAN
Face generation using a Deep Convolutional GAN
Face transition from one to another
Performing vector arithmetic on generated images
9
Encoding Inputs
Encoding Inputs
Introduction
Need for encoding
Encoding an image
Encoding for recommender systems
10
Text Analysis Using Word Vectors
Text Analysis Using Word Vectors
Introduction
Building a word vector from scratch in Python
Building a word vector using the skip-gram and CBOW models
Performing vector arithmetic using pre-trained word vectors
Creating a document vector
Building word vectors using fastText
Building word vectors using GloVe
Building sentiment classification using word vectors
11
Building a Recurrent Neural Network
Building a Recurrent Neural Network
Introduction
Building an RNN from scratch in Python
Implementing RNN for sentiment classification
Building a LSTM Network from scratch in Python
Implementing LSTM for sentiment classification
Implementing stacked LSTM for sentiment classification
12
Applications of a Many-to-One Architecture RNN
Applications of a Many-to-One Architecture RNN
Generating text
Movie recommendations
Topic-modeling, using embeddings
Forecasting the value of a stock's price
13
Sequence-to-Sequence Learning
Sequence-to-Sequence Learning
Introduction
Returning sequences of outputs from a network
Building a chatbot
Machine translation
Encoder decoder architecture for machine translation
Encoder decoder architecture with attention for machine translation
14
End-to-End Learning
End-to-End Learning
Introduction
Connectionist temporal classification (CTC)
Handwritten-text recognition
Image caption generation
Generating captions, using beam search
15
Audio Analysis
Audio Analysis
Classifying a song by genre
Generating music using deep learning
Transcribing audio into text
16
Reinforcement Learning
Reinforcement Learning
The optimal action to take in a simulated game with a non-negative reward
The optimal action to take in a state in a simulated game
Q-learning to maximize rewards when playing Frozen Lake
Deep Q-learning to balance a cart pole
Deep Q-learning to play Space Invaders game
17
Other Books You May Enjoy
Other Books You May Enjoy
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To get the most out of this book

  • You should have prior knowledge of Keras and be comfortable with Python and have basic understanding of Machine Learning. Additionally, refer to the code files in GitHub while you are going through recipes. Due care is taken to ensure that all code is properly indented in book. However, it is highly recommended that you follow the code present in GitHub while implementing the code yourself

Download the example code files

You can download the example code files for this book from your account at www.packt.com. If you purchased this book elsewhere, you can visit www.packt.com/support and register to have the files emailed directly to you.

You can download the code files by following these steps:

  1. Log in or register at www.packt.com.
  2. Select the SUPPORT tab.
  3. Click on Code Downloads & Errata.
  4. Enter the name of the book in the Search box and follow the onscreen instructions.

Once the file is downloaded, please make sure that you unzip or extract the folder using the latest version of:

  • WinRAR/7-Zip for Windows
  • Zipeg/iZip/UnRarX for Mac
  • 7-Zip/PeaZip for Linux

The code bundle for the book is also hosted on GitHub at https://github.com/PacktPublishing/Neural-Networks-with-Keras-Cookbook. In case there's an update to the code, it will be updated on the existing GitHub repository.

We also have other code bundles from our rich catalog of books and videos available at https://github.com/PacktPublishing/. Check them out!

Download the color images

Conventions used

There are a number of text conventions used throughout this book.

CodeInText: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: "The variable named Defaultin2yrs is the output variable that we need to predict."

A block of code is set as follows:

data['DebtRatio_newoutlier']=np.where(data['DebtRatio']>1,1,0)
data['DebtRatio']=np.where(data['DebtRatio']>1,1,data['DebtRatio'])

Bold: Indicates a new term, an important word, or words that you see onscreen.

Warnings or important notes appear like this.
Tips and tricks appear like this.
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