Confusion Matrix and Classification Metrics

Read TP, FP, FN, TN, accuracy, precision, recall, specificity, F1, IoU, Dice, and Jaccard from a matrix.

This English version is designed as a concise learning guide for international visitors. It summarizes the core idea, explains what to pay attention to, and links directly to the interactive lab when one is available.

What you will learn

The article focuses on the practical intuition behind Confusion Matrix and Classification Metrics. Instead of starting from heavy notation, begin with the visual pattern: what changes, what stays stable, and what the metric or algorithm is trying to optimize.

How to use the interactive part

1. Start with the default sample data.
2. Change one parameter at a time and observe the visual response.
3. Run or step through the algorithm when the lab supports training.
4. Read the live formula and metric panel to connect intuition with calculation.

Key takeaway

A good machine learning explanation should connect three views: the data, the algorithm, and the evaluation result. Use this article as the reading layer, then use the lab as the experimental layer.