Description
Pandas version checks
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I have checked that this issue has not already been reported.
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I have confirmed this bug exists on the latest version of pandas.
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I have confirmed this bug exists on the main branch of pandas.
Reproducible Example
import pandas as pd
df = pd.DataFrame([{'A': 1, 'B': 2, 'C': 3}]).set_index(["A", "B"])
def numba_func(values, index):
return 1
res = df.groupby('A').transform(
numba_func, engine="numba"
)Issue Description
Traceback (most recent call last):
File "/home/ninja/workspace/lumen_psf/python/psf/script/dev_tst.py", line 11, in
res = df.groupby('A').transform(
File "/home/ninja/miniconda3/envs/py39pandas13/lib/python3.9/site-packages/pandas/core/groupby/generic.py", line 1357, in transform
return self._transform(
File "/home/ninja/miniconda3/envs/py39pandas13/lib/python3.9/site-packages/pandas/core/groupby/groupby.py", line 1430, in _transform
result = self._transform_with_numba(
File "/home/ninja/miniconda3/envs/py39pandas13/lib/python3.9/site-packages/pandas/core/groupby/groupby.py", line 1187, in _transform_with_numba
result = numba_transform_func(
File "/home/ninja/miniconda3/envs/py39pandas13/lib/python3.9/site-packages/numba/core/dispatcher.py", line 468, in compile_for_args
error_rewrite(e, 'typing')
File "/home/ninja/miniconda3/envs/py39pandas13/lib/python3.9/site-packages/numba/core/dispatcher.py", line 409, in error_rewrite
raise e.with_traceback(None)
numba.core.errors.TypingError: Failed in nopython mode pipeline (step: nopython frontend)
non-precise type array(pyobject, 1d, C)
During: typing of argument at /home/ninja/miniconda3/envs/py39pandas13/lib/python3.9/site-packages/pandas/core/groupby/numba.py (167)
File "../../../../../miniconda3/envs/py39pandas13/lib/python3.9/site-packages/pandas/core/groupby/numba_.py", line 167:
def group_transform(
) -> np.ndarray:
result = np.empty((len(values), num_columns))
^
Expected Behavior
Up to pandas version 1.2 this worked like a charm. Apparently the redesign of the grouping did not respect to multi-index cases when using calculation engine numba.
Installed Versions
INSTALLED VERSIONS
commit : 66e3805
python : 3.9.12.final.0
python-bits : 64
OS : Linux
OS-release : 5.13.0-40-generic
Version : #45~20.04.1-Ubuntu SMP Mon Apr 4 09:38:31 UTC 2022
machine : x86_64
processor : x86_64
byteorder : little
LC_ALL : None
LANG : en_US.UTF-8
LOCALE : en_US.UTF-8
pandas : 1.3.5
numpy : 1.21.6
pytz : 2022.1
dateutil : 2.8.2
pip : 22.0.4
setuptools : 59.8.0
Cython : None
pytest : None
hypothesis : None
sphinx : None
blosc : None
feather : None
xlsxwriter : None
lxml.etree : None
html5lib : None
pymysql : None
psycopg2 : None
jinja2 : None
IPython : None
pandas_datareader: None
bs4 : None
bottleneck : None
fsspec : None
fastparquet : None
gcsfs : None
matplotlib : None
numexpr : None
odfpy : None
openpyxl : None
pandas_gbq : None
pyarrow : None
pyxlsb : None
s3fs : None
scipy : None
sqlalchemy : None
tables : None
tabulate : None
xarray : None
xlrd : None
xlwt : None
numba : 0.55.1