Book Image

Python Feature Engineering Cookbook

By : Soledad Galli
Book Image

Python Feature Engineering Cookbook

By: Soledad Galli

Overview of this book

Feature engineering is invaluable for developing and enriching your machine learning models. In this cookbook, you will work with the best tools to streamline your feature engineering pipelines and techniques and simplify and improve the quality of your code. Using Python libraries such as pandas, scikit-learn, Featuretools, and Feature-engine, you’ll learn how to work with both continuous and discrete datasets and be able to transform features from unstructured datasets. You will develop the skills necessary to select the best features as well as the most suitable extraction techniques. This book will cover Python recipes that will help you automate feature engineering to simplify complex processes. You’ll also get to grips with different feature engineering strategies, such as the box-cox transform, power transform, and log transform across machine learning, reinforcement learning, and natural language processing (NLP) domains. By the end of this book, you’ll have discovered tips and practical solutions to all of your feature engineering problems.
Table of Contents (13 chapters)

Creating representations of day and week

Some events occur more often on certain days of the week, for example, loan applications occur more likely during the week than over weekends, whereas others occur more often during certain weeks of the year. Businesses and organizations may also want to track some key performance metrics throughout the week. Therefore, deriving weeks and days from a date variable is very useful to support organizations in meeting their objectives, and they may also be predictive in machine learning. In this recipe, we will learn how to derive different representations of days and weeks from a datetime variable using pandas and NumPy.

How to do it...

To proceed with the recipe, let's import the...