Overview

Labeling is expensive. Models plateau. The biggest win is choosing the next example to label. This book shows you how to do that with active learning so every annotation moves the metric that matters. You start with the core idea: pick the most useful data, not the most data. Then you learn the main families of acquisition strategies. Uncertainty methods like entropy and margin. Diversity methods like core set and k-center. Hybrid approaches such as BADGE and expected error reduction. You will compare pool based and stream based setups, add human in the loop review, and design stopping rules that save time and budget. Projects are end to end in Python with scikit-learn, PyTorch, and Hugging Face. You will simulate label policies, audit leakage, build proper baselines, and backtest with walk forward splits. You will wire in annotation tools, track label cost, and plot label efficiency curves. You will monitor drift, re-query on failure modes, and keep quality high with calibration, AUROC and AUPRC, and decision curves. Case studies cover vision, NLP, tabular risk scoring, and anomaly detection so you can copy workable patterns fast. If you want higher accuracy with fewer labels and a repeatable loop that pays for itself, buy this book now and start prioritizing the right data points.

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