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PERF: groupby.transform broadcast perf #45708

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Merged
merged 4 commits into from
Jan 30, 2022
Merged

PERF: groupby.transform broadcast perf #45708

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9a33f42
replace np.concatenate with np.tile for better perf
lukemanley Jan 30, 2022
b4e3afb
Merge branch 'main' into groupby-transform-broadcast-perf
lukemanley Jan 30, 2022
8f623ab
whatsnew
lukemanley Jan 30, 2022
a571965
add asv benchmark
lukemanley Jan 30, 2022
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1 change: 1 addition & 0 deletions doc/source/whatsnew/v1.5.0.rst
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Expand Up @@ -202,6 +202,7 @@ Performance improvements
~~~~~~~~~~~~~~~~~~~~~~~~
- Performance improvement in :meth:`.GroupBy.transform` for some user-defined DataFrame -> Series functions (:issue:`45387`)
- Performance improvement in :meth:`DataFrame.duplicated` when subset consists of only one column (:issue:`45236`)
- Performance improvement in :meth:`.GroupBy.transform` when broadcasting values for user-defined functions (:issue:`45708`)
-

.. ---------------------------------------------------------------------------
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2 changes: 1 addition & 1 deletion pandas/core/groupby/generic.py
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Expand Up @@ -1795,7 +1795,7 @@ def _wrap_transform_general_frame(
res_frame.index = group.index
else:
res_frame = obj._constructor(
np.concatenate([res.values] * len(group.index)).reshape(group.shape),
np.tile(res.values, (len(group.index), 1)),
columns=group.columns,
index=group.index,
)
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