This method modifies the :None:None:`out` parameter rather than returning an object. :None:None:`counts` is modified to hold group sizes
Values into which this method will write its results.
A zeroed array of the same shape as labels, populated by group sizes during algorithm.
2-d array of the values to find the mean of.
Array containing unique label for each group, with its ordering matching up to the corresponding record in :None:None:`values`.
Only used in add and prod. Always -1.
True if :None:None:`values` contains datetime-like entries.
Not used.
Not used.
Compute the mean per label given a label assignment for each value. NaN values are ignored.
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