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Scala for Machine Learning, Second Edition

You're reading from   Scala for Machine Learning, Second Edition Build systems for data processing, machine learning, and deep learning

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Product type Paperback
Published in Sep 2017
Publisher Packt
ISBN-13 9781787122383
Length 740 pages
Edition 2nd Edition
Languages
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Author (1):
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Patrick R. Nicolas Patrick R. Nicolas
Author Profile Icon Patrick R. Nicolas
Patrick R. Nicolas
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Table of Contents (21) Chapters Close

Preface 1. Getting Started FREE CHAPTER 2. Data Pipelines 3. Data Preprocessing 4. Unsupervised Learning 5. Dimension Reduction 6. Naïve Bayes Classifiers 7. Sequential Data Models 8. Monte Carlo Inference 9. Regression and Regularization 10. Multilayer Perceptron 11. Deep Learning 12. Kernel Models and SVM 13. Evolutionary Computing 14. Multiarmed Bandits 15. Reinforcement Learning 16. Parallelism in Scala and Akka 17. Apache Spark MLlib A. Basic Concepts B. References Index

Naïve Bayes and text mining


The extraction of the most relevant features to build a model relies on discovery and data mining. For many applications, the data available to the scientist is unstructured text. The multinomial Naïve Bayes classifier is particularly suited for text mining.

The Naïve Bayes formula is quite effective to classify the following entities:

  • E-mail spams

  • Business news stories

  • Movie reviews

  • Technical papers per field of expertise

This third use case consists of predicting the direction of a stock given the financial news. There are two types of news that affects the stock of a particular company:

  • Macro trends: This consists of the economic or social news such as conflicts, economic trends, or labor market statistics

  • Micro updates: This consists of the financial or market news related to this specific company such as earnings, change in ownership, or press releases

Micro-economic news related to a specific company has the potential to affect the sentiment of investors toward...

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