Overfitting playground
Evaluate with evidence
Measure overfitting with denominators, slices, and gates chosen before seeing results on the spam classifier lab.
1Learn the idea
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Metrics
Track for overfitting: train/val/test scores, generalization gap, calibration, live precision/recall. Report fractions like 36/40, not vague quality adjectives. Segment by language, plan tier, document length, or other slices that matter for the spam classifier lab.
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Protocol
Freeze inputs and neighboring versions while evaluating overfitting. Change one control. Pair results case by case on the spam classifier lab. Define hard gates (severe errors, privacy, latency) before the bake-off. Use deterministic checks where possible; humans for nuance; model judges only with calibration against gold.
Numeric reminder for overfitting: generalization gap = training score − validation score = 0.99 − 0.84 = 0.15
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Make it operational
Resist adding a twelfth metric before the first three for overfitting on the spam classifier lab have owners. This workload improves faster when a small scorecard is trusted than when a warehouse of unused plots exists.
Also pin one numeric memory from this overfitting chapter: generalization gap = training score − validation score = 0.99 − 0.84 = 0.15 That number is not decoration; it is a template for how claims about overfitting on the spam classifier lab should look in design docs. Scoped specifically to overfitting / spam classifier lab / evaluation.
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Common mix-ups
People confuse overfitting with neighboring buzzwords when debugging the spam classifier lab. Before changing prompts, ask whether the broken stage was evidence gathering, the overfitting judgment itself, validation, or the product action. Fixing the wrong stage creates folklore (“we tried overfitting and it failed”) that blocks the next team on the spam classifier lab. Scoped specifically to overfitting / spam classifier lab / evaluation.
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Rehearsal (overfitting-playground/evaluation)
Write a five-line artifact for this page: goal, inputs, check, owner, stop rule. Invent one fluent failure that the check would catch. Keep details specific to overfitting playground rather than generic AI advice.
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Rehearsal (overfitting-playground/evaluation)
Write a five-line artifact for this page: goal, inputs, check, owner, stop rule. Invent one fluent failure that the check would catch. Keep details specific to overfitting playground rather than generic AI advice.
Read
Rehearsal (overfitting-playground/evaluation)
Write a five-line artifact for this page: goal, inputs, check, owner, stop rule. Invent one fluent failure that the check would catch. Keep details specific to overfitting playground rather than generic AI advice.
Read
Rehearsal (overfitting-playground/evaluation)
Write a five-line artifact for this page: goal, inputs, check, owner, stop rule. Invent one fluent failure that the check would catch. Keep details specific to overfitting playground rather than generic AI advice.
Read
Rehearsal (overfitting-playground/evaluation)
Write a five-line artifact for this page: goal, inputs, check, owner, stop rule. Invent one fluent failure that the check would catch. Keep details specific to overfitting playground rather than generic AI advice.
Go deeper
Before you start
Why this matters
A demo of the spam classifier lab looks great on three hand-picked examples of overfitting. What does that demo refuse to tell you?
Related lessons
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