#dimensionality-reduction

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2 questions · 2 min · score and explanations at the end

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A factory collects sensor logs from its machines. Which of these uses of the logs is unsupervised learning?

Compressing the logs into 3 numbers that keep most of their variation1
Predicting each machine's failure date from logs labeled with its past failures2
Learning a maintenance plan from the rewards it earns for avoided breakdowns3
Sorting logs into normal or faulty, using labels assigned by the engineers4

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