Artificial Intelligence / AI 0403 · Atom · ~20 seconds
The Test Drawer
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Before any learning begins, part of the data is locked away as a test set — untouched until grading day, because a test row that influenced learning is training data under another name.
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The stall log: rows one through six teach; rows seven and eight wait in the drawer.
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Peeking converts test into training silently — the drawer's value is exactly its untouchedness.