pandas.TimedeltaIndex.factorize
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TimedeltaIndex.factorize(sort=False, na_sentinel=-1)[source]
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Encode the object as an enumerated type or categorical variable Parameters: sort : boolean, default False Sort by values na_sentinel: int, default -1 Value to mark “not found” Returns: labels : the indexer to the original array uniques : the unique Index 
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Licensed under the 3-clause BSD License.
    https://pandas.pydata.org/pandas-docs/version/0.20.3/generated/pandas.TimedeltaIndex.factorize.html