Book Image

Scala for Machine Learning - Second Edition

Book Image

Scala for Machine Learning - 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

Pros and cons


There is so much information that can be crammed into one chapter. The examples selected in this chapter do not do justice to the versatility and accuracy of the Naïve Bayes family of classifiers.

The Naïve Bayes algorithm is a simple and robust generative classifier that relies on prior conditional probabilities to extract a model from a training dataset. The Naïve Bayes model has its benefits, as mentioned here:

  • It is easy to implement and parallelize

  • It has a very low computational complexity: O((n+c)*m), where m is the number of features, c is the number of classes, and n is the number of observations

  • It handles missing data

  • It supports incremental updates, insertions, and deletions

However, Naïve Bayes is not a silver bullet. It has the following disadvantages:

  • It requires a large training set to achieve reasonable accuracy

  • The assumption of the independence of features is not practical in the real world

  • It requires dealing with the zero-frequency problem for counters