Name of a class impacts the value of its __metadata_request__* variables #28430
Description
Describe the bug
The metadata request of an object are dependent on its name.
Basically identical class can have different behaviours when calling class()._get_metadata_request()) if they have different name.
Steps/Code to Reproduce
from sklearn.model_selection import GroupKFold
class class_1(GroupKFold):
__metadata_request__split = {"groups": "sample_domain"}
class Class_1(GroupKFold):
__metadata_request__split = {"groups": "sample_domain"}
print(class_1()._get_metadata_request())
print(Class_1()._get_metadata_request())
Expected Results
{'split': {'groups': 'sample_domain'}}
{'split': {'groups': 'sample_domain'}}
Actual Results
{'split': {'groups': 'sample_domain'}}
{'split': {'groups': True}}
Versions
System:
python: 3.9.18 (main, Nov 2 2023, 16:52:00) [Clang 14.0.0 (clang-1400.0.29.202)]
executable: /Users/yanislalou/Documents/CMAP/scikit-learn/sklearn-env/bin/python
machine: macOS-12.7.2-arm64-arm-64bit
Python dependencies:
sklearn: 1.5.dev0
pip: 23.3.1
setuptools: 68.2.2
numpy: 1.26.4
scipy: 1.12.0
Cython: 3.0.8
pandas: None
matplotlib: None
joblib: 1.3.2
threadpoolctl: 3.3.0
Built with OpenMP: False
threadpoolctl info:
user_api: blas
internal_api: openblas
num_threads: 8
prefix: libopenblas
filepath: /Users/yanislalou/Documents/CMAP/scikit-learn/sklearn-env/lib/python3.9/site-packages/numpy/.dylibs/libopenblas64_.0.dylib
version: 0.3.23.dev
threading_layer: pthreads
architecture: armv8
user_api: blas
internal_api: openblas
num_threads: 8
prefix: libopenblas
filepath: /Users/yanislalou/Documents/CMAP/scikit-learn/sklearn-env/lib/python3.9/site-packages/scipy/.dylibs/libopenblas.0.dylib
version: 0.3.21.dev
threading_layer: pthreads
architecture: armv8