Feature Selection in Machine Learning with Python
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Feature Selection in Machine Learning with Python

Over 20 methods to select the most predictive features and build simpler, faster, and more reliable machine learning models.

About the Book

Feature selection is the process of selecting a subset of features from the total variables in a data set to train machine learning algorithms. Feature selection is an important aspect of data mining and predictive modelling.

Feature selection is key for developing simpler, faster, and highly performant machine learning models and can help to avoid overfitting. The aim of any feature selection algorithm is to create classifiers or regression models that run faster and whose outputs are easier to understand by their users.

In this book, you will find the most widely used feature selection methods to select the best subsets of predictor variables from your data. You will learn about filter, wrapper, and embedded methods for feature selection. Then, you will discover methods designed by computer science professionals or used in data science competitions that are faster or more scalable.

First, we will discuss the use of statistical and univariate algorithms in the context of artificial intelligence. Next, we will cover methods that select features through optimization of the model performance. We will move on to feature selection algorithms that are baked into the machine learning techniques. And finally, we will discuss additional methods designed by data scientists specifically for applied predictive modeling.

In this book, you will find out how to:

  • Remove useless and redundant features by examining variability and correlation.
  • Choose features based on statistical tests such as ANOVA, chi-square, and mutual information.
  • Select features by using Lasso regularization or decision tree based feature importance, which are embedded in the machine learning modeling process.
  • Select features by recursive feature elimination, addition, or value permutation.

Each chapter fleshes out various methods for feature selection that share common characteristics. First, you will learn the fundamentals of the feature selection method, and next you will find a Python implementation.

The book comes with an accompanying Github repository with the full source code that you can download, modify, and use in your own data science projects and case studies.

Feature selection methods differ from dimensionality reduction methods in that feature selection techniques do not alter the original representation of the variables, but merely select a reduced number of features from the training data that produce performant machine learning models.

Using the Python libraries Scikit-learn, MLXtend, and Feature-engine, you’ll learn how to select the best numerical and categorical features for regression and classification models in just a few lines of code. You will also learn how to make feature selection part of your machine learning workflow.

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    • Artificial Intelligence
    • Machine Learning
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About the Author

Soledad Galli
Soledad Galli, PhD

Soledad Galli is a data scientist, instructor, and software developer with more than 10 years of experience in world-class academic institutions and renowned businesses. She has developed and put into production machine learning models to assess insurance claims, credit risk, and prevent fraud.

Sole teaches online courses on machine learning, which have enrolled 40,000+ students worldwide and consistently receive good student reviews. She is also the developer and maintainer of the open-source Python library Feature-engine, which is currently downloaded about 100k+ times per month.

Sole received a Data Science Leaders' award in 2018 and was recognized as one of LinkedIn's voices in data science and analytics in 2019. She is passionate about sharing her machine learning knowledge. She gave talks at data science conferences and wrote several publications about data science and machine learning, including one on the misuse of data and artificial intelligence.

Soledad Galli, PhD

Episode 266

Table of Contents

  • Preface
    • Who is this book for
    • What this book covers
    • Technical requirements
    • Download the code files
    • Get in touch
  • Chapter 1: Feature Selection Overview
    • What is feature selection?
    • Why do we select features?
    • Feature selection methods
    • Filter methods
    • Wrapper methods
    • Embedded methods
    • Other methods
    • Summary
    • References
  • Chapter 2: Basic Feature Selection Methods
    • Constant features
    • Quasi-constant features
    • Duplicated features
    • References
  • Chapter 3: Correlation of Predictors
    • Correlation coefficients
    • Visualizing correlated features
    • Remove correlated features: retain first, remove the rest
    • Remove correlated features: retain best feature, remove the rest
    • Correlation of categorical variables
    • Summary
  • Chapter 4: Filter Methods
    • Chi-square
    • Anova
    • Correlation
    • Mutual information
    • Refereces
  • Chapter 5: Univariate Feature Selection
    • Single feature model
    • Target encoding
    • References
  • Chapter 6: Wrapper Methods
    • Exhaustive search
    • Forward feature selection
    • Backward feature elimination
    • References
  • Chapter 7: Embedded Methods
    • Lasso
    • Feature importance from decision trees
    • Recursive feature elimination by feature importance
    • References
  • Chapter 8: Other Methods
    • Recursive feature addition
    • Recursive feature elimination
    • Feature shuffling
    • References
  • Next steps
    • Other books by the author
    • Online courses by the author

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