Overview

Introduction to scikit-learn and Its EcosystemVolume 2: Applied Modeling, Pipelines, and Evaluation As Fast As Possible (AFAP) Most machine learning models fail not because of poor algorithms, but because of incorrect workflows, data leakage, weak evaluation strategies, and misleading metrics. This book teaches you how to avoid those mistakes. Introduction to scikit-learn and Its Ecosystem - Volume 2 is a practical, example-driven guide to building reliable, reproducible, and evaluation-correct machine learning pipelines using scikit-learn. It moves beyond toy examples and focuses on real-world problems encountered by students, engineers, and researchers. Written in the AFAP (As Fast As Possible) style, the book minimizes unnecessary theory and emphasizes clarity, correctness, and reproducibility. Every concept is explained through step-by-step workflows that can be executed exactly as shown. What You Will Learn- How to design leak-free preprocessing and modeling pipelines - How to use Pipeline and ColumnTransformer correctly - Why accuracy alone is misleading, especially on imbalanced data - How to evaluate models using precision, recall, F1-score, ROC-AUC, and MCC - How cross-validation can silently fail-and how to avoid it - How to move safely from toy datasets to real-world data - How to diagnose overfitting, instability, and false confidence - How to build reproducible, production-ready workflows What Makes This Book Different Realistic workflows instead of artificial demos Good and bad practices shown side-by-side Strong focus on evaluation correctness Clear explanations of common failure modes Reproducible examples with fixed random states You will learn not just how to train models, but how to trust the results. Who This Book Is For- Students moving beyond basic machine learning - Engineers and data scientists working with real datasets - Researchers who care about correct evaluation - Anyone frustrated by models that perform well on paper but fail in practice Prerequisites: Basic Python knowledge and familiarity with fitting simple scikit-learn models (or completion of Volume 1). Included Resources- Fully reproducible code examples - Real-world datasets (via scikit-learn and OpenML) - Companion GitHub repository and online materials If you want to stop guessing, stop leaking data, and start building machine-learning pipelines you can trust, this book is for you. Fast. Practical. Correct. Reproducible.

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