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In a book I'm reading I've come across the following quote:

Accuracy on the test set is a good performance measure only when there is a relatively uniform distribution of target categories in the training set.

If the real world categories are distributed 10% A and 90% B, then should the training categories also be 10% A and 90% B, or should they be 50% A and 50% B?

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marked as duplicate by Sycorax, mdewey, steffen, kjetil b halvorsen, whuber Jul 29 '18 at 17:08

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