Book Image

Python Machine Learning by Example, - Third Edition

By : Yuxi (Hayden) Liu
Book Image

Python Machine Learning by Example, - Third Edition

By: Yuxi (Hayden) Liu

Overview of this book

Python Machine Learning By Example, Third Edition serves as a comprehensive gateway into the world of machine learning (ML). With six new chapters, on topics including movie recommendation engine development with Naïve Bayes, recognizing faces with support vector machine, predicting stock prices with artificial neural networks, categorizing images of clothing with convolutional neural networks, predicting with sequences using recurring neural networks, and leveraging reinforcement learning for making decisions, the book has been considerably updated for the latest enterprise requirements. At the same time, this book provides actionable insights on the key fundamentals of ML with Python programming. Hayden applies his expertise to demonstrate implementations of algorithms in Python, both from scratch and with libraries. Each chapter walks through an industry-adopted application. With the help of realistic examples, you will gain an understanding of the mechanics of ML techniques in areas such as exploratory data analysis, feature engineering, classification, regression, clustering, and NLP. By the end of this ML Python book, you will have gained a broad picture of the ML ecosystem and will be well-versed in the best practices of applying ML techniques to solve problems.
Table of Contents (17 chapters)
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Building a movie recommender with Naïve Bayes

After the toy example, it is now time to build a movie recommender (or, more specifically, movie preference classifier) using a real dataset. We herein use a movie rating dataset ( The movie rating data was collected by the GroupLens Research group from the MovieLens website (

For demonstration purposes, we will use the small dataset, ml-latest-small (downloaded from the following link: of (size: 1 MB)) as an example. It has around 100,00 ratings, ranging from 1 to 5, given by 6,040 users on 3,706 movies (last updated September 2018).

Unzip the file and you will see the following four files:

  • movies.dat: It contains the movie information in the format of MovieID::Title::Genres.
  • ratings.dat: It contains user movie ratings in the format of UserID...