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

Markov Chain Monte Carlo (MCMC)


As we have seen in The Markov property section of Chapter 7, Sequential Data Models, the state or prediction in a sequence is a function of the previous state(s). In the first order, Markov processes the probability of a state at time t depending on the probability of the state at time t-1.

The concept of a Markov chain can be extended with the traditional Monte Carlo sampling to model distributions with a large number of variables (high dimension) or parametric distributions.

Overview

The idea behind the Markov Chain Monte Carlo inference or sampling is to randomly walk along the chain from a given state and successively select (randomly) the next state from the state-transition probability matrix (The Hidden Markov Model/Notation in Chapter 7, Sequential Data Models) [8:6].

This iterative process explores the distribution from the transition probability matrix if it matches the target distribution also known as the proposal distribution. At each iteration, MCMC...