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

Using Latent Semantic Analysis for text analytics with Spark 2.0


In this recipe, we will explore LSA a data dump of articles from Wikipedia. LSA translates into analyzing a corpus of documents to find hidden meaning or concepts in those documents.

In the first recipe of this chapter, we covered the basics of the TF (that is, term frequency) technique. In this recipe, we use HashingTF for calculating TF and use IDF to fit a model into the calculated TF. At its core, LSA uses singular value decomposition (SVD) on the term frequency document to reduce dimensionality and therefore extract the most important concepts. There are other cleanup steps that we need to do (for example, stop words and stemming) that will clean up the bag of words we start analyzing it.

How to do it...

  1. Start a new project in IntelliJ or in an IDE of your choice. Make sure the necessary JAR files are included.
  1. The package statement for the recipe is as follows:
package spark.ml.cookbook.chapter12
  1. Import the necessary packages...