Book Image

Neural Networks with R

By : Balaji Venkateswaran, Giuseppe Ciaburro
Book Image

Neural Networks with R

By: Balaji Venkateswaran, Giuseppe Ciaburro

Overview of this book

Neural networks are one of the most fascinating machine learning models for solving complex computational problems efficiently. Neural networks are used to solve wide range of problems in different areas of AI and machine learning. This book explains the niche aspects of neural networking and provides you with foundation to get started with advanced topics. The book begins with neural network design using the neural net package, then you’ll build a solid foundation knowledge of how a neural network learns from data, and the principles behind it. This book covers various types of neural network including recurrent neural networks and convoluted neural networks. You will not only learn how to train neural networks, but will also explore generalization of these networks. Later we will delve into combining different neural network models and work with the real-world use cases. By the end of this book, you will learn to implement neural network models in your applications with the help of practical examples in the book.

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Table of Contents (14 chapters)
Title Page
Title Page
Credits
Credits
About the Authors
About the Authors
About the Reviewer
About the Reviewer
www.PacktPub.com
www.PacktPub.com
Customer Feedback
Customer Feedback
Preface
Preface
Free Chapter
1
Neural Network and Artificial Intelligence Concepts
Neural Network and Artificial Intelligence Concepts
Introduction
Inspiration for neural networks
How do neural networks work?
Layered approach
Weights and biases
Training neural networks
Epoch
Activation functions
Different activation functions
Which activation functions to use?
Perceptron and multilayer architectures
Forward and backpropagation
Step-by-step illustration of a neuralnet and an activation function
Feed-forward and feedback networks
Gradient descent
Taxonomy of neural networks
Simple example using R neural net library - neuralnet()
Implementation using nnet() library
Deep learning
Pros and cons of neural networks
Best practices in neural network implementations
Quick note on GPU processing
Summary
2
Learning Process in Neural Networks
Learning Process in Neural Networks
What is machine learning?
Supervised learning
Unsupervised learning
Reinforcement learning
Training and testing the model
The data cycle
Evaluation metrics
Learning in neural networks
Back to backpropagation
Neural network learning algorithm optimization
Supervised learning in neural networks
Unsupervised learning in neural networks 
Summary
3
Deep Learning Using Multilayer Neural Networks
Deep Learning Using Multilayer Neural Networks
Introduction of DNNs
R for DNNs
Multilayer neural networks with neuralnet
Training and modeling a DNN using H2O
Deep autoencoders using H2O
Summary
4
Perceptron Neural Network Modeling – Basic Models
Perceptron Neural Network Modeling – Basic Models
Perceptrons and their applications
Simple perceptron – a linear separable classifier
Linear separation
The perceptron function in R
Multi-Layer Perceptron
MLP R implementation using RSNNS
Summary
5
Training and Visualizing a Neural Network in R
Training and Visualizing a Neural Network in R
Data fitting with neural network
Classifing breast cancer with a neural network
Early stopping in neural network training
Avoiding overfitting in the model
Generalization of neural networks
Scaling of data in neural network models
Ensemble predictions using neural networks
Summary
6
Recurrent and Convolutional Neural Networks
Recurrent and Convolutional Neural Networks
Recurrent Neural Network
The rnn package in R
LSTM model
Convolutional Neural Networks
Common CNN architecture - LeNet
Humidity forecast using RNN
Summary
7
Use Cases of Neural Networks – Advanced Topics
Use Cases of Neural Networks – Advanced Topics
TensorFlow integration with R
Keras integration with R
MNIST HWR using R
LSTM using the iris dataset
Working with autoencoders
PCA using H2O
Autoencoders using H2O
Breast cancer detection using darch
Summary

Training and testing the model

Training and testing the model forms the basis for further usage of the model for prediction in predictive analytics. Given a dataset of 100 rows of data, which includes the predictor and response variables, we split the dataset into a convenient ratio (say 70:30) and allocate 70 rows for training and 30 rows for testing. The rows are selected in random to reduce bias.

Once the training data is available, the data is fed to the neural network to get the massive universal function in place. The training data determines the weights, biases, and activation functions to be used to get to output from input. Until recently, we could not say that a weight has a positive or a negative influence on the target variable. But now we've been able to shed some light inside the black box. For example, by plotting a trained neural network, we can discover trained synaptic weights and basic information about the training process.

Once the sufficient convergence is achieved, the...

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