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Informative error when encountering categories that were not seen in training #508

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Run time

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Job	Run time
Build wheels on ubuntu-20.04	4m 34s
Build source distribution	29s
Build wheels on macos-11	15m 8s
Build wheels on windows-2019	7m 4s
upload_testpypi	0s
upload_pypi	0s
	27m 15s