Machine Learning Interview Questions

What's the difference between supervised and unsupervised learning?

Supervised has labeled data; unsupervised doesn't. Example: regression vs. clustering."

Can you explain overfitting?

Overfitting is when a model fits training data too closely, performing poorly on newdata. Regularization techniques prevent it.

Define bias-variance tradeoff.

Balancing bias (underfitting) and variance (overfitting) for optimal model performance. Techniques like cross-validation help."

What's feature engineering?

Transforming raw data into meaningful features for model training. Examples: scaling, one-hot encoding, and feature selection.

How do you evaluate a classification model?

Metrics like accuracy, precision, recall, and F1 score assess its performance on test data. Choose based on project goals.

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