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

Summary


The study of the combination of two concepts: Markov processes and latent variables or states can be overwhelming at times. The implementation of the hidden Markov model, for instance, is particularly challenging for engineers with limited exposure to dynamic programming techniques.

In this chapter, you learned about the Markov processes, the generative HMM to maximize the disjoint probability, p(X, Y), and the discriminative CRF to maximize log of the condition probability, p(Y|X).

Markov decision processes are conceptually also used in reinforcement learning; see: Chapter 15, Reinforcement Learning.

HMM is a special form of Bayes Network: It requires the observations to be independent. Although restrictive, the conditional independence pre-requisite makes the HMM easy to understand and validate, which is not the case for CRF. As a side note, recurrent neural networks are an alternative to HMM for predicting state given a sequence of observations.

The conditional random fields estimate...