Ebook: Feature engineering for machine learning: principles and techniques for data scientists

Intro; Copyright; Table of Contents; Preface; Introduction; Conventions Used in This Book; Using Code Examples; O'Reilly Safari; How to Contact Us; Acknowledgments; Special Thanks from Alice; Special Thanks from Amanda; Chapter 1. The Machine Learning Pipeline; Data; Tasks; Models; Features; Model Evaluation; Chapter 2. Fancy Tricks with Simple Numbers; Scalars, Vectors, and Spaces; Dealing with Counts; Binarization; Quantization or Binning; Log Transformation; Log Transform in Action; Power Transforms: Generalization of the Log Transform; Feature Scaling or Normalization; Min-Max Scaling;"Feature engineering is a crucial step in the machine-learning pipeline, yet this topic is rarely examined on its own. With this practical book, you'll learn techniques for extracting and transforming features--the numeric representations of raw data--into formats for machine-learning models. Each chapter guides you through a single data problem, such as how to represent text or image data. Together, these examples illustrate the main principles of feature engineering. Rather than simply teach these principles, authors Alice Zheng and Amanda Casari focus on practical application with exercises throughout the book. The closing chapter brings everything together by tackling a real-world, structured dataset with several feature-engineering techniques. Python packages including numpy, Pandas, Scikit-learn, and Matplotlib are used in code examples. You'll examine: Feature engineering for numeric data: filtering, binning, scaling, log transforms, and power transforms Natural text techniques: bag-of-words, n-grams, and phrase detection Frequency-based filtering and feature scaling for eliminating uninformative features Encoding techniques of categorical variables, including feature hashing and bin-counting Model-based feature engineering with principal component analysis The concept of model stacking, using k-means as a featurization technique Image feature extraction with manual and deep-learning techniques."--Résumé de l'éditeur.