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Python Feature Engineering Cookbook

You're reading from   Python Feature Engineering Cookbook Over 70 recipes for creating, engineering, and transforming features to build machine learning models

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Product type Paperback
Published in Jan 2020
Publisher Packt
ISBN-13 9781789806311
Length 372 pages
Edition 1st Edition
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Author (1):
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Soledad Galli Soledad Galli
Author Profile Icon Soledad Galli
Soledad Galli
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Table of Contents (13) Chapters Close

Preface 1. Foreseeing Variable Problems When Building ML Models 2. Imputing Missing Data FREE CHAPTER 3. Encoding Categorical Variables 4. Transforming Numerical Variables 5. Performing Variable Discretization 6. Working with Outliers 7. Deriving Features from Dates and Time Variables 8. Performing Feature Scaling 9. Applying Mathematical Computations to Features 10. Creating Features with Transactional and Time Series Data 11. Extracting Features from Text Variables 12. Other Books You May Enjoy

Performing discretization with k-means clustering

In discretization using k-means clustering, the intervals are the clusters identified by the k-means algorithm. The number of clusters (k) is defined by the user. The k-means clustering algorithm has two main steps. In the initialization step, k observations are chosen randomly as the initial centers of the k clusters, and the remaining data points are assigned to the closest cluster. In the iteration step, the centers of the clusters are re-computed as the average points of all of the observations within the cluster, and the observations are reassigned to the newly created closest cluster. The iteration step continues until the optimal k centers are found. In this recipe, we will perform k-means discretization with scikit-learn, using the Boston House Prices dataset.

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