Book Image

Scala for Machine Learning, Second Edition - Second Edition

Book Image

Scala for Machine Learning, Second Edition - Second Edition

Overview of this book

The discovery of information through data clustering and classification is becoming a key differentiator for competitive organizations. Machine learning applications are everywhere, from self-driving cars, engineering design, logistics, manufacturing, and trading strategies, to detection of genetic anomalies. The book is your one stop guide that introduces you to the functional capabilities of the Scala programming language that are critical to the creation of machine learning algorithms such as dependency injection and implicits. You start by learning data preprocessing and filtering techniques. Following this, you'll move on to unsupervised learning techniques such as clustering and dimension reduction, followed by probabilistic graphical models such as Naïve Bayes, hidden Markov models and Monte Carlo inference. Further, it covers the discriminative algorithms such as linear, logistic regression with regularization, kernelization, support vector machines, neural networks, and deep learning. You’ll move on to evolutionary computing, multibandit algorithms, and reinforcement learning. Finally, the book includes a comprehensive overview of parallel computing in Scala and Akka followed by a description of Apache Spark and its ML library. With updated codes based on the latest version of Scala and comprehensive examples, this book will ensure that you have more than just a solid fundamental knowledge in machine learning with Scala.
Table of Contents (27 chapters)
Scala for Machine Learning Second Edition
Credits
About the Author
About the Reviewers
www.PacktPub.com
Customer Feedback
Preface
Index

Convolution neural networks


This section is provided as a brief introduction to convolution neural networks without Scala implementation. In a nutshell, a convolutional neural network is a feed-forward network with multiple hidden layers, some of them relying on convolution instead of matrix or tensor multiplication (wT .x).

Up to this point, the layers of the perceptron were organized as a fully connected network. The number of synapses or weights increases significantly as the number and size of hidden layers increases. For instance, a network for a feature set with a dimension 6, three hidden layers of 64 nodes each, and 1 output value requires (7x64 + 2*65*64 + 65*1) = 8833 weights!

Applications such as image or character recognition require a very large feature set, making training a fully connected layered perceptron very computationally intensive. Moreover, these applications need to convey spatial information such as the proximity of pixels as part of the features vector.

A recent approach...