Book Image

Mastering Predictive Analytics with R - Second Edition

By : James D. Miller, Rui Miguel Forte
Book Image

Mastering Predictive Analytics with R - Second Edition

By: James D. Miller, Rui Miguel Forte

Overview of this book

R offers a free and open source environment that is perfect for both learning and deploying predictive modeling solutions. With its constantly growing community and plethora of packages, R offers the functionality to deal with a truly vast array of problems. The book begins with a dedicated chapter on the language of models and the predictive modeling process. You will understand the learning curve and the process of tidying data. Each subsequent chapter tackles a particular type of model, such as neural networks, and focuses on the three important questions of how the model works, how to use R to train it, and how to measure and assess its performance using real-world datasets. How do you train models that can handle really large datasets? This book will also show you just that. Finally, you will tackle the really important topic of deep learning by implementing applications on word embedding and recurrent neural networks. By the end of this book, you will have explored and tested the most popular modeling techniques in use on real- world datasets and mastered a diverse range of techniques in predictive analytics using R.
Table of Contents (22 chapters)
Mastering Predictive Analytics with R Second Edition
Credits
About the Authors
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface
8
Dimensionality Reduction
Index

Radial basis function networks


A radial basis function network-based upon the concept of function approximation - is a kind of artificial neural network that uses radial basis functions to define a node's output (given a set of inputs). The output of the network consists of a linear combination of radial basis functions of the inputs and neuron parameters.

Radial basis function (RBF) networks (also referred to as RBFNN for Radial Basis Function Neural Networks) will have three separate layers: an input layer, a hidden layer, and a linear output layer. The input layer will be a set of several nodes that transfer transition the input values to the second (or hidden) layer where activation patterns are applied. These patterns will be selected radial basis functions that best fit the application or objective. This transformation occurs in a non-linear fashion. The third layer (or output layer) provides the response of the network to the activation or RFB functions applied to the inputs. In an...