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#numerictransformations #bagofwordsandngrams #categoricalfeaturehashing #principalcomponentanalysis #kmeansfeaturization #FeatureEngineeringforMachineLearning
Feature Engineering for Machine Learning: Principles and Techniques for Data Scientists is a practical technical guide by Alice Zheng and Amanda Casari, published by O'Reilly Media. It concentrates on a part of machine learning work that is often compressed into the label preprocessing: converting messy, heterogeneous raw information into representations that learning algorithms can use. Rather than surveying predictive algorithms in depth, the book examines how choices about data representation affect what a model can detect. Its examples use the Python data science stack, including NumPy, pandas, scikit-learn, and Matplotlib, making the material oriented toward implementation as well as concepts. The coverage spans numeric, categorical, text, and image data, then extends to feature selection and model-based construction of new variables. The organizing purpose is practical: readers learn not merely which transformation exists, but why scale, distribution, sparsity, frequency, and domain context shape its appropriateness. A concluding structured-data exercise connects separate techniques into a more realistic workflow.