Interview Q&A / Machine Learning
Machine Learning interview questions
Supervised vs unsupervised learning, overfitting, metrics and the classic models, explained simply.
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- How can scaling or imputing before the train-test split cause data leakage?
If you compute the mean or maximum on the full dataset, information from test rows leaks into training. Always fit scalers and imputers on the training set only, then apply them to the test set. A scikit-learn Pipeline does this automatically.
IntermediateQuick answer1 min read