Avoiding leakage

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Task

📝 **Question:** You scale all features with `StandardScaler().fit_transform(X)` BEFORE train/test split. What's wrong?

📋 Pick the right answer.

💡 **Hint:** Re-read the theory above if unsure.

Keep going

📊quiz

Cross-validation

📊quiz

Loading a CSV

📊quiz

Selecting columns and rows

🤖predictFREE

Prerequisites — what you should know before this track

⚡predictFREE

Prerequisites — what you should know before this track

🎯 Quiz

Question

📝 **Question:** You scale all features with `StandardScaler().fit_transform(X)` BEFORE train/test split. What's wrong?

📋 Pick the right answer.

💡 **Hint:** Re-read the theory above if unsure.

Keep going

💬 Discussion