Explain overfitting and how to prevent it

Q: Explain overfitting and how to prevent it

This is a Machine Learning interview question from Pinterest for Machine Learning Engineer roles. View the full question and solution on PracHub.

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Question

You are asked rapid-fire ML fundamentals questions.

What is overfitting? Explain it in terms of training vs. validation performance and generalization.
How can you prevent or mitigate overfitting? List practical techniques and when you would use them.
What is the difference between L1 and L2 regularization? Compare their effect on model weights, feature selection, optimization behavior, and typical use cases.

Explain overfitting and how to prevent it

Solution

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