Data Science 面试题与答案

Question: What is regularization in machine learning, and why is it necessary?

Answer: Regularization is a technique used to prevent overfitting by adding a penalty term to the model's cost function. It discourages overly complex models by penalizing large coefficients.

Example:

L1 regularization (Lasso) penalizes the absolute values of coefficients, encouraging sparsity in feature selection.