[python-package] move validation up earlier in cv() and train() #5836
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jameslamb
requested review from
StrikerRUS,
shiyu1994 and
jmoralez
as code owners
jmoralez
approved these changes
Apr 19, 2023
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Moves some validation up earlier in
cv()andtrain(), and clarifies some error messages in those functions.Moving this validation up a bit earlier means that users can get quicker feedback about calls to those functions that are destined to fail before incurring the time and computation cost of potentially-expensive operations like loading
init_modelfrom a file.