Book Image

Learning PySpark

By : Tomasz Drabas, Denny Lee
Book Image

Learning PySpark

By: Tomasz Drabas, Denny Lee

Overview of this book

Apache Spark is an open source framework for efficient cluster computing with a strong interface for data parallelism and fault tolerance. This book will show you how to leverage the power of Python and put it to use in the Spark ecosystem. You will start by getting a firm understanding of the Spark 2.0 architecture and how to set up a Python environment for Spark. You will get familiar with the modules available in PySpark. You will learn how to abstract data with RDDs and DataFrames and understand the streaming capabilities of PySpark. Also, you will get a thorough overview of machine learning capabilities of PySpark using ML and MLlib, graph processing using GraphFrames, and polyglot persistence using Blaze. Finally, you will learn how to deploy your applications to the cloud using the spark-submit command. By the end of this book, you will have established a firm understanding of the Spark Python API and how it can be used to build data-intensive applications.
Table of Contents (20 chapters)
Learning PySpark
Credits
Foreword
About the Authors
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface
Index

Overview of the package


At the high level, MLlib exposes three core machine learning functionalities:

  • Data preparation: Feature extraction, transformation, selection, hashing of categorical features, and some natural language processing methods

  • Machine learning algorithms: Some popular and advanced regression, classification, and clustering algorithms are implemented

  • Utilities: Statistical methods such as descriptive statistics, chi-square testing, linear algebra (sparse and dense matrices and vectors), and model evaluation methods

As you can see, the palette of available functionalities allows you to perform almost all of the fundamental data science tasks.

In this chapter, we will build two classification models: a linear regression and a random forest. We will use a portion of the US 2014 and 2015 birth data we downloaded from http://www.cdc.gov/nchs/data_access/vitalstatsonline.htm; from the total of 300 variables we selected 85 features that we will use to build our models. Also, out...