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Machine Learning Practice · End Term · 13 Sept 2026 · May 2026 term

Question 18: Consider the following two ensemble regression architect…

Question 18

+3 marksOne correct option

Consider the following two ensemble regression architectures trained on the same dataset:

  1. A

    ensemble1 computes a weighted sum of predictions where later trees have higher weights; ensemble2 takes a simple arithmetic mean of all trees.

  2. B

    ensemble1 reduces variance by averaging independent predictions from 100 trees, meaning increasing n_estimators to 500 will ideally not cause overfitting.

  3. C

    ensemble2 reduces bias sequentially, meaning increasing n_estimators to 500 carries no risk of overfitting.

  4. D

    Both models output predictions by calculating the majority vote across the terminal leaf nodes of all individual base estimators.

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Correct answer

  • B

    ensemble1 reduces variance by averaging independent predictions from 100 trees, meaning increasing n_estimators to 500 will ideally not cause overfitting.

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Question 18 of 30 in the IIT Madras BS Machine Learning Practice (MLP) End Term paper sat on 13 Sept 2026, in the May 2026 term (Machine Learning Practice 13 Sep 26). It carries 3 marks.

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