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PERF: Fix performance regression in infer_dtype #30202

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Merged
jreback merged 11 commits into from
Dec 23, 2019
Merged

PERF: Fix performance regression in infer_dtype #30202

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9edf9b3
Move skipna check to after type casting of values.
groutr Dec 11, 2019
70c8bed
Add entry to whatsnew.
groutr Dec 11, 2019
ea579f7
Update doc/source/whatsnew/v1.0.0.rst
groutr Dec 11, 2019
df55864
Add asv tests for skipna.
groutr Dec 11, 2019
28c4969
Merge branch 'infer_dtype_perf' of github.com:groutr/pandas into infe…
groutr Dec 11, 2019
94a968c
make pep8 happy.
groutr Dec 11, 2019
3ba2229
make black happy.
groutr Dec 12, 2019
f97fb1f
make isort happy.
groutr Dec 13, 2019
a5efb8f
Make dtype inference test cases larger.
groutr Dec 16, 2019
903abc2
Merge branch 'master' into infer_dtype_perf
groutr Dec 16, 2019
8d7ec5d
Fix benchmark params.
groutr Dec 17, 2019
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1 change: 1 addition & 0 deletions doc/source/whatsnew/v1.0.0.rst
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Expand Up @@ -645,6 +645,7 @@ Performance improvements
- Performance improvement when checking if values in a :class:`Categorical` are equal, equal or larger or larger than a given scalar.
The improvement is not present if checking if the :class:`Categorical` is less than or less than or equal than the scalar (:issue:`29820`)
- Performance improvement in :meth:`Index.equals` and :meth:`MultiIndex.equals` (:issue:`29134`)
- Performance improvement in :func:`infer_dtype` when ``skipna`` is ``True`` (:issue:`28814`)

.. _whatsnew_1000.bug_fixes:

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6 changes: 3 additions & 3 deletions pandas/_libs/lib.pyx
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Expand Up @@ -1259,16 +1259,16 @@ def infer_dtype(value: object, skipna: bool = True) -> str:
# make contiguous
values = values.ravel()

if skipna:
values = values[~isnaobj(values)]

val = _try_infer_map(values)
if val is not None:
return val

if values.dtype != np.object_:
values = values.astype('O')

if skipna:
values = values[~isnaobj(values)]

n = len(values)
if n == 0:
return 'empty'
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