PERF: pd.BooleanDtype in row operations is still very slow

[Alexia-I]

Pandas version checks

• I have checked that this issue has not already been reported.

• I have confirmed this issue exists on the latest version of pandas.

• I have confirmed this issue exists on the main branch of pandas.

Reproducible Example

The performance issue is the same as #52016. I assume it may be caused by some dependency missing but i installed some accelerating dependency like numba and pyarrow and the time is still larger than 10 seconds. @rhshadrach

import pandas as pd
import numpy as np

shape = 250_000, 100
mask = pd.DataFrame(np.random.randint(0, 1, size=shape))


np_mask = mask.astype(bool)
pd_mask = mask.astype(pd.BooleanDtype())

assert all(isinstance(dtype, pd.BooleanDtype) for dtype in pd_mask.dtypes)
assert all(isinstance(dtype, np.dtype) for dtype in np_mask.dtypes)
# column operations are not that much slower
%timeit pd_mask.any(axis=0) 
%timeit np_mask.any(axis=0)
# using pandas.BooleanDtype back end for ROW operations is MUCH SLOWER
%timeit pd_mask.any(axis=1)
%timeit np_mask.any(axis=1)

13.1 ms ± 522 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)
5.7 ms ± 21.5 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)
10.2 s ± 1.41 s per loop (mean ± std. dev. of 7 runs, 1 loop each)
7.74 ms ± 40.5 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)

Installed Versions

INSTALLED VERSIONS

commit : a671b5a
python : 3.9.18.final.0
python-bits : 64
OS : Linux
OS-release : 5.15.0-88-generic
Version : #98~20.04.1-Ubuntu SMP Mon Oct 9 16:43:45 UTC 2023
machine : x86_64
processor : x86_64
byteorder : little
LC_ALL : None
LANG : en_US.UTF-8
LOCALE : en_US.UTF-8

pandas : 2.1.4
numpy : 1.26.3
pytz : 2023.3.post1
dateutil : 2.8.2
setuptools : 68.2.2
pip : 23.3.1
Cython : 3.0.8
pytest : None
hypothesis : None
sphinx : None
blosc : None
feather : None
xlsxwriter : None
lxml.etree : None
html5lib : None
pymysql : None
psycopg2 : None
jinja2 : None
IPython : 8.18.1
pandas_datareader : None
bs4 : None
bottleneck : None
dataframe-api-compat: None
fastparquet : None
fsspec : 2023.12.2
gcsfs : None
matplotlib : None
numba : None
numexpr : None
odfpy : None
openpyxl : 3.1.2
pandas_gbq : None
pyarrow : 14.0.2
pyreadstat : None
pyxlsb : None
s3fs : None
scipy : None
sqlalchemy : None
tables : None
tabulate : None
xarray : None
xlrd : None
zstandard : None
tzdata : 2023.4
qtpy : None
pyqt5 : None

Prior Performance

No response

[rhshadrach]

Thanks for the report. I cannot reproduce on 2.1.4:

15.8 ms ± 16.4 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)
4.28 ms ± 9.97 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)
517 ms ± 1.12 ms per loop (mean ± std. dev. of 7 runs, 1 loop each)
3.88 ms ± 3.21 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)

however I get similar times on 2.0.3:

14.6 ms ± 40.7 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)
4.33 ms ± 5.03 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)
11.6 s ± 23.5 ms per loop (mean ± std. dev. of 7 runs, 1 loop each)
3.92 ms ± 7.44 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)

Can you try running this on the 2.2.0 release candidate? pip install pandas==2.2.0rc0 to install via pip.

[Alexia-I]

Thank you for your response.

I run it on the Linux server and my mac with pandas==2.2.0rc0 and it turns out it only run slower on the Linux, which is kinda strange. I guess it's the problem with the OS rather than the pandas library if no one else has such perf issue.

# on linux
OS                    : Linux
OS-release            : 5.15.0-88-generic
Version               : #98~20.04.1-Ubuntu SMP Mon Oct 9 16:43:45 UTC 2023
machine               : x86_64
processor             : x86_64

11.9 ms ± 139 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)
5.66 ms ± 32.6 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)
12.9 s ± 573 ms per loop (mean ± std. dev. of 7 runs, 1 loop each)
7.73 ms ± 17.8 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)

Darwin
OS-release            : 23.0.0
Version               : Darwin Kernel Version 23.0.0: Thu Aug 17 21:23:05 PDT 2023; root:xnu-10002.1.11~3/RELEASE_ARM64_T6000
machine               : arm64
processor             : arm

9.85 ms ± 9.67 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)
2.71 ms ± 26.7 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)
263 ms ± 4.98 ms per loop (mean ± std. dev. of 7 runs, 1 loop each)
2.56 ms ± 10.4 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)

[rhshadrach]

On Linux where you have 2.1 or later installed, can you try running pd.options.future.infer_string = True. I have a suspicion you are (accidentally) running 2.0.x and this is an option that was only added in 2.1.

[Alexia-I]

Yeah, thank you, it does work...making it 4 times faster, but still slower than 263ms. I found the pd.options.future.infer_string = True in the pandas whatsnew doc. Is this the default setting? Could my performance issue be due to a misuse on my part?

11.7 ms ± 61.9 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)
6.2 ms ± 41.9 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)
3.74 s ± 831 ms per loop (mean ± std. dev. of 7 runs, 1 loop each)
8.21 ms ± 518 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)

[rhshadrach]

pd.options.future.infer_string = True should have no impact on the performance here, it was just an option that was added in 2.1 to tell if you were running on 2.0.x vs 2.1.x (or later). I believe you're just seeing a large (random) variance on timings - this could be the case if you have other processes on your machine using resources.

[Alexia-I]

Thank you. I understand it now. Btw, could anyone else encounter the pd.options.future.infer_string setting issue causing the runtime larger than expected if they do not set it as True in advance?

[jbrockmendel]

This looks like a “lack of 2D EAs” thing

[Alexia-I]

Sorry I did not get the point. Did you mean the performance downgrade comes from lacking data structure(2D EA) support?

This looks like a “lack of 2D EAs” thing