Section 1 — What you will learn
✓ By the end you will understand
- Confusion Matrix = a 2×2 “truth table” for a classifier.
- TP / FP / FN / TN: four ways the gate can be right or wrong.
- Precision: “When I say YES, how often am I correct?”
- Recall: “Of all real YES items, how many did I catch?”
- Threshold trade-off: stricter gate → fewer FP but more FN.
Section 2 — Controls
Same concepts. Challenge adds score + win banner.
Low threshold = catches many YES (high recall), but may catch wrong ones (low precision).
Example: disease screening often has few positives.
More noise = even a perfect threshold struggles.
Tip: start slow to learn, then increase speed.
How to play: The conveyor brings items. Each item has a score (0..1). The gate compares it with your threshold.
Then the item falls into one of 4 bins: TP FP FN TN.
Then the item falls into one of 4 bins: TP FP FN TN.
Section 3 — Live stats
True Positive (TP)
0
False Positive (FP)
0
False Negative (FN)
0
True Negative (TN)
0
Precision
—
TP / (TP + FP)
Recall
—
TP / (TP + FN)
F1 Score
—
2PR / (P + R)
Accuracy
—
(TP + TN) / total
Section 4 — Math (simple)
What the gate is doing
Live: threshold changes everything
Loading…
Section 5 — Arena explanation
- Green item = truly YES (positive).
- Red item = truly NO (negative).
- Score bar on item = model confidence (0..1).
- Purple glow line = your threshold (the decision boundary).
- Bins show TP / FP / FN / TN.
🧠 Kid Coach
Loading…
Tip: Use Step 1 to learn slowly.