Book Image

Apache Spark 2.x Machine Learning Cookbook

By : Mohammed Guller, Siamak Amirghodsi, Shuen Mei, Meenakshi Rajendran, Broderick Hall
Book Image

Apache Spark 2.x Machine Learning Cookbook

By: Mohammed Guller, Siamak Amirghodsi, Shuen Mei, Meenakshi Rajendran, Broderick Hall

Overview of this book

Machine learning aims to extract knowledge from data, relying on fundamental concepts in computer science, statistics, probability, and optimization. Learning about algorithms enables a wide range of applications, from everyday tasks such as product recommendations and spam filtering to cutting edge applications such as self-driving cars and personalized medicine. You will gain hands-on experience of applying these principles using Apache Spark, a resilient cluster computing system well suited for large-scale machine learning tasks. This book begins with a quick overview of setting up the necessary IDEs to facilitate the execution of code examples that will be covered in various chapters. It also highlights some key issues developers face while working with machine learning algorithms on the Spark platform. We progress by uncovering the various Spark APIs and the implementation of ML algorithms with developing classification systems, recommendation engines, text analytics, clustering, and learning systems. Toward the final chapters, we’ll focus on building high-end applications and explain various unsupervised methodologies and challenges to tackle when implementing with big data ML systems.
Table of Contents (20 chapters)
Title Page
Credits
About the Authors
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface

Introduction


In the previous chapters, we used short recipes and extremely simplified code to demonstrate basic building blocks and concepts governing the Spark machine library. In this chapter, we present a more developed application that addresses specific machine learning library domains using Spark's API and facilities. The number of recipes are less in this chapter; however, we get into a more ML application setting.

In this chapter, we explore the system and its using a matrix factorization technique that draws on latent factor models called alternating least square (ALS). In a nutshell, when we try to factorize a large matrix of user-item ratings into two lower ranked, skinnier matrices, we often face a non-linear or non-convex optimization problem that is very difficult to solve. It happens that we are very good at solving convex optimization problems by fixing one leg and partially solving the other and then going back and forth (hence alternating); we can solve this factorization...