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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- What are entropy and information gain in a decision tree?
Entropy measures how mixed a group is: 0 when pure, 1 for a 50-50 split of two classes. Information gain is the entropy before a split minus the weighted entropy after. The tree picks the split with the highest gain.
IntermediateQuick answer1 min read