get_group_index(labels, shape: 'Shape', sort: 'bool', xnull: 'bool') -> 'npt.NDArray[np.int64]'
The length of :None:None:`labels` and :None:None:`shape` must be identical.
Integers identifying levels at each location
Number of unique levels at each location
If the ranks of returned ids should match lexical ranks of labels
If true nulls are excluded. i.e. -1 values in the labels are passed through.
For the particular label_list, gets the offsets into the hypothetical list representing the totally ordered cartesian product of all possible label combinations, as long as this space fits within int64 bounds; otherwise, though group indices identify unique combinations of labels, they cannot be deconstructed. - If sort
, rank of returned ids preserve lexical ranks of labels. i.e. returned id's can be used to do lexical sort on labels; - If :None:None:`xnull` nulls (-1 labels) are passed through.
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