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Mastering Spark for Data Science

You're reading from   Mastering Spark for Data Science Lightning fast and scalable data science solutions

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Product type Paperback
Published in Mar 2017
Publisher Packt
ISBN-13 9781785882142
Length 560 pages
Edition 1st Edition
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Authors (5):
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David George David George
Author Profile Icon David George
David George
Matthew Hallett Matthew Hallett
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Matthew Hallett
Antoine Amend Antoine Amend
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Antoine Amend
Andrew Morgan Andrew Morgan
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Andrew Morgan
Albert Bifet Albert Bifet
Author Profile Icon Albert Bifet
Albert Bifet
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Table of Contents (15) Chapters Close

Preface 1. The Big Data Science Ecosystem 2. Data Acquisition FREE CHAPTER 3. Input Formats and Schema 4. Exploratory Data Analysis 5. Spark for Geographic Analysis 6. Scraping Link-Based External Data 7. Building Communities 8. Building a Recommendation System 9. News Dictionary and Real-Time Tagging System 10. Story De-duplication and Mutation 11. Anomaly Detection on Sentiment Analysis 12. TrendCalculus 13. Secure Data 14. Scalable Algorithms

Chapter 12. TrendCalculus

Long before the concept of what's trending became a popular topic of study by data scientists, there was an older one that is still not well served by data science: it is that of Trends. Presently, the analysis of trends, if it can be called that, is primarily carried out by people "eyeballing" time series charts and offering interpretations. But what is it that people's eyes are doing?

This chapter describes an implementation in Apache Spark of a new algorithm for studying trends numerically, called TrendCalculus, invented by Andrew Morgan. The original reference implementation is written in the Lua language and was open-sourced in 2015, the code can be viewed at https://bitbucket.org/bytesumo/trendcalculus-public.

This chapter explains the core method, which delivers the fast extraction of trend change points on a time series; these are the moments when trends change direction. We will describe our TrendCalculus algorithm in detail...

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