Add errors argument for groupby.sample to ignore errors when group size less than n
#2002
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wjsi
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…size less than `n` (mars-project#2002)
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…size less than `n` (mars-project#2002)
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What do these changes do?
Add
errorsargument for groupby.sample to ignore errors when group size less thann. This also adapts logic from pandas groupby.sample and then bugs of weighted sampling in pandas will not affect Mars.Related issue number
Fixes #2000