Specialization Track

Data Science & Machine Learning Interview Questions & Answers

Supervised vs unsupervised learning, regression, classification, overfitting, and metrics.

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How do classification and regression differ? Give an example of each.

Classification predicts a category or category probability, such as whether a customer will cancel a subscription. Regression predicts a numerical quantity, such as next month’s energy usage. The busi...

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Why should training, validation, and test datasets have different roles?

Training data fits model parameters. Validation data guides model selection, feature decisions, and hyperparameters. Test data provides a final assessment after those choices are fixed. Repeatedly usi...

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