[BUG] Incorrect dtype when iterating over dtypes in cudf.pandas

Describe the bug When using cudf.pandas and iterating over the dtypes of a dataframe, categorical dtype objects are reported as cudf.CategoricalDtype and not pandas.CategoricalDtype, causing isinstance checks to fail unexpectedly.

Steps/Code to reproduce bug Run the following using python -m cudf.pandas and compare to output without cudf.pandas

import pandas as pd

df = pd.DataFrame({"A": ["a", "b", "c", "a"]})
df["A"] = df["A"].astype('category')

print("In for loop: ", [isinstance(t, pd.CategoricalDtype) for t in df.dtypes][0])
print("With iloc: ", isinstance(df.dtypes.iloc[0], pd.CategoricalDtype))

$ python repro.py
In for loop:  True
With iloc:  True

$ python -m cudf.pandas repro.py
In for loop:  False
With iloc:  True

Expected behavior Output should be the same for the isinstance checks with and without cudf.pandas and regardless of whether or not we are iterating over dtypes or selecting them by index.

Environment details (please complete the following information):

Environment location: GCP g2-standard-8 instance
Linux Distro/Architecture: Debian 11 Bullseye amd64
GPU Model/Driver: L4 / 550.90.07
CUDA: 12.4
Method of cuDF & cuML install: conda (RAPIDS 24.10)

conda list Output:

# packages in environment at /opt/conda/envs/rapids-24.10:
#
# Name                    Version                   Build  Channel
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_openmp_mutex             4.5                       2_gnu    conda-forge
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aiosignal                 1.3.1              pyhd8ed1ab_0    conda-forge
anyio                     4.6.2.post1        pyhd8ed1ab_0    conda-forge
aom                       3.9.1                hac33072_0    conda-forge
argon2-cffi               23.1.0             pyhd8ed1ab_0    conda-forge
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arrow                     1.3.0              pyhd8ed1ab_0    conda-forge
asttokens                 2.4.1              pyhd8ed1ab_0    conda-forge
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attrs                     24.2.0             pyh71513ae_0    conda-forge
aws-c-auth                0.7.31               hd5d0ea3_3    conda-forge
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brotli                    1.1.0                hb9d3cd8_2    conda-forge
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charls                    2.4.2                h59595ed_0    conda-forge
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cuda-cudart-static        12.5.82              he02047a_0    conda-forge
cuda-cudart-static_linux-64 12.5.82              h85509e4_0    conda-forge
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cuda-nvcc-dev_linux-64    12.5.82              ha770c72_0    conda-forge
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cuda-nvrtc                12.5.82              he02047a_0    conda-forge
cuda-nvvm-dev_linux-64    12.5.82              ha770c72_0    conda-forge
cuda-nvvm-impl            12.5.82              h59595ed_0    conda-forge
cuda-nvvm-tools           12.5.82              h59595ed_0    conda-forge
cuda-profiler-api         12.5.39              ha770c72_0    conda-forge
cuda-python               12.6.0          py312he9d8a76_1    conda-forge
cuda-version              12.5                 hd4f0392_3    conda-forge
cudf                      24.10.01        cuda12_py312_241009_g7b0adfa253_0    rapidsai
cudf_kafka                24.10.01        cuda12_py312_241009_g7b0adfa253_0    rapidsai
cugraph                   24.10.00        cuda12_py312_241009_g6f2510afa_0    rapidsai
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cuvs                      24.10.00        cuda12_py312_241009_g7de3a05_0    rapidsai
cuxfilter                 24.10.00        cuda12_py312_241009_g8c10c79_0    rapidsai
cycler                    0.12.1             pyhd8ed1ab_0    conda-forge
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dask                      2024.9.0           pyhd8ed1ab_0    conda-forge
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dask-cuda                 24.10.00        py312_241009_g4e45758_0    rapidsai
dask-cudf                 24.10.01        cuda12_py312_241009_g7b0adfa253_0    rapidsai
dask-expr                 1.1.14             pyhd8ed1ab_0    conda-forge
datashader                0.16.3             pyhd8ed1ab_0    conda-forge
dav1d                     1.2.1                hd590300_0    conda-forge
debugpy                   1.8.7           py312h2ec8cdc_0    conda-forge
decorator                 5.1.1              pyhd8ed1ab_0    conda-forge
defusedxml                0.7.1              pyhd8ed1ab_0    conda-forge
distributed               2024.9.0           pyhd8ed1ab_0    conda-forge
distributed-ucxx          0.40.00         py3.12_241009_g152901c_0    rapidsai
dlpack                    0.8                  h59595ed_3    conda-forge
entrypoints               0.4                pyhd8ed1ab_0    conda-forge
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geopandas-base            1.0.1              pyha770c72_1    conda-forge
geos                      3.13.0               h5888daf_0    conda-forge
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libarrow-substrait        17.0.0          he882d9a_23_cpu    conda-forge
libavif16                 1.1.1                h104a339_1    conda-forge
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libbrotlicommon           1.1.0                hb9d3cd8_2    conda-forge
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libcblas                  3.9.0           24_linux64_openblas    conda-forge
libcrc32c                 1.1.2                h9c3ff4c_0    conda-forge
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libcudf_kafka             24.10.01        cuda12_241009_g7b0adfa253_0    rapidsai
libcufft                  11.2.3.61            he02047a_0    conda-forge
libcufile                 1.10.1.7             he02047a_0    conda-forge
libcufile-dev             1.10.1.7             he02047a_0    conda-forge
libcugraph                24.10.00        cuda12_241009_g6f2510afa_0    rapidsai
libcugraph_etl            24.10.00        cuda12_241009_g6f2510afa_0    rapidsai
libcugraphops             24.10.00        cuda12_241009_g7057cc73_0    rapidsai
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libcuvs                   24.10.00        cuda12_241009_g7de3a05_0    rapidsai
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mdurl                     0.1.2              pyhd8ed1ab_0    conda-forge
minizip                   4.0.7                h401b404_0    conda-forge
mistune                   3.0.2              pyhd8ed1ab_0    conda-forge
msgpack-python            1.1.0           py312h68727a3_0    conda-forge
multidict                 6.1.0           py312h178313f_1    conda-forge
multipledispatch          0.6.0              pyhd8ed1ab_1    conda-forge
munkres                   1.1.4              pyh9f0ad1d_0    conda-forge
nbclient                  0.10.0             pyhd8ed1ab_0    conda-forge
nbconvert-core            7.16.4             pyhd8ed1ab_1    conda-forge
nbformat                  5.10.4             pyhd8ed1ab_0    conda-forge
nccl                      2.23.4.1             h52f6c39_1    conda-forge
ncurses                   6.5                  he02047a_1    conda-forge
nest-asyncio              1.6.0              pyhd8ed1ab_0    conda-forge
networkx                  3.4.2              pyhd8ed1ab_0    conda-forge
nodejs                    22.9.0               hf235a45_0    conda-forge
notebook                  7.2.2              pyhd8ed1ab_0    conda-forge
notebook-shim             0.2.4              pyhd8ed1ab_0    conda-forge
numba                     0.60.0          py312h83e6fd3_0    conda-forge
numpy                     2.0.2           py312h58c1407_0    conda-forge
nvcomp                    4.0.1                hbc370b7_0    conda-forge
nvtx                      0.2.10          py312h66e93f0_2    conda-forge
nx-cugraph                24.10.00        py312_241009_g6f2510afa_0    rapidsai
openjpeg                  2.5.2                h488ebb8_0    conda-forge
openssl                   3.3.2                hb9d3cd8_0    conda-forge
orc                       2.0.2                h690cf93_1    conda-forge
overrides                 7.7.0              pyhd8ed1ab_0    conda-forge
packaging                 24.1               pyhd8ed1ab_0    conda-forge
pandas                    2.2.2           py312h1d6d2e6_1    conda-forge
pandocfilters             1.5.0              pyhd8ed1ab_0    conda-forge
panel                     1.5.2              pyhd8ed1ab_0    conda-forge
param                     2.1.1              pyhff2d567_0    conda-forge
parso                     0.8.4              pyhd8ed1ab_0    conda-forge
partd                     1.4.2              pyhd8ed1ab_0    conda-forge
pcre2                     10.44                hba22ea6_2    conda-forge
pexpect                   4.9.0              pyhd8ed1ab_0    conda-forge
pickleshare               0.7.5                   py_1003    conda-forge
pillow                    11.0.0          py312h7b63e92_0    conda-forge
pip                       24.2               pyh8b19718_1    conda-forge
pkgutil-resolve-name      1.3.10             pyhd8ed1ab_1    conda-forge
platformdirs              4.3.6              pyhd8ed1ab_0    conda-forge
proj                      9.5.0                h12925eb_0    conda-forge
prometheus_client         0.21.0             pyhd8ed1ab_0    conda-forge
prompt-toolkit            3.0.48             pyha770c72_0    conda-forge
prompt_toolkit            3.0.48               hd8ed1ab_0    conda-forge
propcache                 0.2.0           py312h66e93f0_2    conda-forge
psutil                    6.0.0           py312h66e93f0_2    conda-forge
pthread-stubs             0.4               hb9d3cd8_1002    conda-forge
ptyprocess                0.7.0              pyhd3deb0d_0    conda-forge
pure_eval                 0.2.3              pyhd8ed1ab_0    conda-forge
py-xgboost                2.1.1           rapidsai_pyh53d8b89_5    rapidsai
pyarrow                   17.0.0          py312h9cebb41_1    conda-forge
pyarrow-core              17.0.0          py312h9cafe31_1_cpu    conda-forge
pycparser                 2.22               pyhd8ed1ab_0    conda-forge
pyct                      0.5.0              pyhd8ed1ab_0    conda-forge
pygments                  2.18.0             pyhd8ed1ab_0    conda-forge
pylibcudf                 24.10.01        cuda12_py312_241009_g7b0adfa253_0    rapidsai
pylibcugraph              24.10.00        cuda12_py312_241009_g6f2510afa_0    rapidsai
pylibraft                 24.10.00        cuda12_py312_241009_g397042a0_0    rapidsai
pynvjitlink               0.3.0           py312hd269673_0    rapidsai
pynvml                    11.4.1             pyhd8ed1ab_0    conda-forge
pyogrio                   0.10.0          py312he8b4914_0    conda-forge
pyparsing                 3.2.0              pyhd8ed1ab_1    conda-forge
pyproj                    3.7.0           py312he630544_0    conda-forge
pysocks                   1.7.1              pyha2e5f31_6    conda-forge
python                    3.12.7          hc5c86c4_0_cpython    conda-forge
python-confluent-kafka    2.5.3           py312h66e93f0_0    conda-forge
python-dateutil           2.9.0              pyhd8ed1ab_0    conda-forge
python-fastjsonschema     2.20.0             pyhd8ed1ab_0    conda-forge
python-json-logger        2.0.7              pyhd8ed1ab_0    conda-forge
python-tzdata             2024.2             pyhd8ed1ab_0    conda-forge
python_abi                3.12                    5_cp312    conda-forge
pytz                      2024.2             pyhd8ed1ab_0    conda-forge
pyviz_comms               3.0.3              pyhd8ed1ab_0    conda-forge
pywavelets                1.7.0           py312hc0a28a1_2    conda-forge
pyyaml                    6.0.2           py312h66e93f0_1    conda-forge
pyzmq                     26.2.0          py312hbf22597_3    conda-forge
qhull                     2020.2               h434a139_5    conda-forge
raft-dask                 24.10.00        cuda12_py312_241009_g397042a0_0    rapidsai
rapids                    24.10.00        cuda12_py312_241009_g19a0c5a_0    rapidsai
rapids-dask-dependency    24.10.00                   py_0    rapidsai
rapids-xgboost            24.10.00        cuda12_py312_241009_g19a0c5a_0    rapidsai
rav1e                     0.6.6                he8a937b_2    conda-forge
rdma-core                 54.0                 h5888daf_0    conda-forge
re2                       2024.07.02           h77b4e00_1    conda-forge
readline                  8.2                  h8228510_1    conda-forge
referencing               0.35.1             pyhd8ed1ab_0    conda-forge
requests                  2.32.3             pyhd8ed1ab_0    conda-forge
rfc3339-validator         0.1.4              pyhd8ed1ab_0    conda-forge
rfc3986-validator         0.1.1              pyh9f0ad1d_0    conda-forge
rich                      13.9.3             pyhd8ed1ab_0    conda-forge
rmm                       24.10.00        cuda12_py312_241009_g3223f841_0    rapidsai
rpds-py                   0.20.0          py312h12e396e_1    conda-forge
s2n                       1.5.5                h3931f03_0    conda-forge
scikit-image              0.24.0          py312h1df14c2_2    conda-forge
scikit-learn              1.5.2           py312h7a48858_1    conda-forge
scipy                     1.14.1          py312h62794b6_1    conda-forge
send2trash                1.8.3              pyh0d859eb_0    conda-forge
setuptools                75.1.0             pyhd8ed1ab_0    conda-forge
shapely                   2.0.6           py312h391bc85_2    conda-forge
simpervisor               1.0.0              pyhd8ed1ab_0    conda-forge
six                       1.16.0             pyh6c4a22f_0    conda-forge
snappy                    1.2.1                ha2e4443_0    conda-forge
sniffio                   1.3.1              pyhd8ed1ab_0    conda-forge
sortedcontainers          2.4.0              pyhd8ed1ab_0    conda-forge
soupsieve                 2.5                pyhd8ed1ab_1    conda-forge
spdlog                    1.14.1               hed91bc2_1    conda-forge
sqlite                    3.47.0               h9eae976_0    conda-forge
stack_data                0.6.2              pyhd8ed1ab_0    conda-forge
streamz                   0.6.4              pyh6c4a22f_0    conda-forge
svt-av1                   2.2.1                h5888daf_0    conda-forge
tblib                     3.0.0              pyhd8ed1ab_0    conda-forge
terminado                 0.18.1             pyh0d859eb_0    conda-forge
threadpoolctl             3.5.0              pyhc1e730c_0    conda-forge
tifffile                  2024.9.20          pyhd8ed1ab_0    conda-forge
tinycss2                  1.3.0              pyhd8ed1ab_0    conda-forge
tk                        8.6.13          noxft_h4845f30_101    conda-forge
tomli                     2.0.2              pyhd8ed1ab_0    conda-forge
toolz                     1.0.0              pyhd8ed1ab_0    conda-forge
tornado                   6.4.1           py312h66e93f0_1    conda-forge
tqdm                      4.66.5             pyhd8ed1ab_0    conda-forge
traitlets                 5.14.3             pyhd8ed1ab_0    conda-forge
treelite                  4.3.0           py312h01abfbf_0    conda-forge
types-python-dateutil     2.9.0.20241003     pyhff2d567_0    conda-forge
typing-extensions         4.12.2               hd8ed1ab_0    conda-forge
typing_extensions         4.12.2             pyha770c72_0    conda-forge
typing_utils              0.1.0              pyhd8ed1ab_0    conda-forge
tzdata                    2024b                hc8b5060_0    conda-forge
uc-micro-py               1.0.3              pyhd8ed1ab_0    conda-forge
ucx                       1.17.0               h05e919c_3    conda-forge
ucx-proc                  1.0.0                       gpu    rapidsai
ucx-py                    0.40.00         py312_241009_g773cd1e_0    rapidsai
ucxx                      0.40.00         cuda12_py3.12_241009_g152901c_0    rapidsai
unicodedata2              15.1.0          py312h98912ed_0    conda-forge
uri-template              1.3.0              pyhd8ed1ab_0    conda-forge
uriparser                 0.9.8                hac33072_0    conda-forge
urllib3                   2.2.3              pyhd8ed1ab_0    conda-forge
wcwidth                   0.2.13             pyhd8ed1ab_0    conda-forge
webcolors                 24.8.0             pyhd8ed1ab_0    conda-forge
webencodings              0.5.1              pyhd8ed1ab_2    conda-forge
websocket-client          1.8.0              pyhd8ed1ab_0    conda-forge
wheel                     0.44.0             pyhd8ed1ab_0    conda-forge
widgetsnbextension        4.0.13             pyhd8ed1ab_0    conda-forge
xarray                    2024.9.0           pyhd8ed1ab_1    conda-forge
xerces-c                  3.2.5                h988505b_2    conda-forge
xgboost                   2.1.1           rapidsai_pyh9bdd636_5    rapidsai
xorg-libxau               1.0.11               hb9d3cd8_1    conda-forge
xorg-libxdmcp             1.1.5                hb9d3cd8_0    conda-forge
xyzservices               2024.9.0           pyhd8ed1ab_0    conda-forge
xz                        5.2.6                h166bdaf_0    conda-forge
yaml                      0.2.5                h7f98852_2    conda-forge
yarl                      1.15.5          py312h66e93f0_0    conda-forge
zeromq                    4.3.5                h3b0a872_6    conda-forge
zfp                       1.0.1                h5888daf_2    conda-forge
zict                      3.0.0              pyhd8ed1ab_0    conda-forge
zipp                      3.20.2             pyhd8ed1ab_0    conda-forge
zlib                      1.3.1                hb9d3cd8_2    conda-forge
zlib-ng                   2.2.2                h5888daf_0    conda-forge
zstandard                 0.23.0          py312hef9b889_1    conda-forge
zstd                      1.5.6                ha6fb4c9_0    conda-forge

Additional context This prevents training an XGBoost model on categorical variables using cudf.pandas if the .plot method of a Series has been called beforehand. See separate issue for information on unexpected behavior from .plot.

rapidsai / cuml

[BUG] Incorrect dtype when iterating over dtypes in cudf.pandas #6122