Topic
Data Leakage
2 episodes
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Overview: Train Test Split
We finally slow down on train-test split, because we keep bumping into it every time we talk about whether a model actually learned something. We use the sealed-final-exam picture to make the training set, validation set, test set, overfitting, leakage, and cross-validation click without assuming ML background.
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Why Powerful ML Is Deceptively Easy — Part 2 | Towards Data Science
Laura and Harper dissect the article’s claim that spatial leakage makes ML seem more powerful than it is, walk through the London house‑price experiment, critique the technical arguments, and agree on who really needs to watch out for these traps.