Module 8 Assessment: Feature Selection, Dimensionality, and Inspection Check

Estimated active time: 30-45 minutes

Question 1

Which features carry no relationship to the target, and did your method find them?

Pass answer: names them and reports honestly if the method missed them — that is a result about the method.

Question 2

How stable is your importance ranking across seeds?

Pass answer: repeats with a different seed and reports how much the order moves.

Question 3

What happened to the score after removal, and to the model size?

Pass answer: gives both before and after, and does not treat a small score drop as failure.

Question 4

Why is removing a feature that improves the test score a mistake?

Pass answer: identifies it as selection on the test set, which invalidates the estimate.