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Description
Describe the bug
Using set_output(transfrom="pandas") doesn't return a pandas dataframe for the StandardScaler's inverse_transform method.
Steps/Code to Reproduce
from sklearn.preprocessing import StandardScaler
from sklearn.datasets import load_breast_cancer
X, _ = load_breast_cancer(return_X_y=True, as_frame=True)
scaler = StandardScaler().fit(X)
Xt = scaler.transform(X)
print(scaler.inverse_transform(Xt))Expected Results
I expect a pd.DataFrame in return, just like with the transform method.
Actual Results
A numpy array.
[[1.799e+01 1.038e+01 1.228e+02 ... 2.654e-01 4.601e-01 1.189e-01]
[2.057e+01 1.777e+01 1.329e+02 ... 1.860e-01 2.750e-01 8.902e-02]
[1.969e+01 2.125e+01 1.300e+02 ... 2.430e-01 3.613e-01 8.758e-02]
...
[1.660e+01 2.808e+01 1.083e+02 ... 1.418e-01 2.218e-01 7.820e-02]
[2.060e+01 2.933e+01 1.401e+02 ... 2.650e-01 4.087e-01 1.240e-01]
[7.760e+00 2.454e+01 4.792e+01 ... 0.000e+00 2.871e-01 7.039e-02]]
Versions
System:
python: 3.11.2 (tags/v3.11.2:878ead1, Feb 7 2023, 16:38:35) [MSC v.1934 64 bit (AMD64)]
executable: C:\Users\Mavs\Documents\Python\ATOM\venv311\Scripts\python.exe
machine: Windows-10-10.0.19045-SP0
Python dependencies:
sklearn: 1.3.2
pip: 23.3.1
setuptools: 68.2.2
numpy: 1.24.4
scipy: 1.11.3
Cython: 3.0.5
pandas: 2.1.2
matplotlib: 3.8.0
joblib: 1.3.2
threadpoolctl: 3.2.0
Built with OpenMP: True
threadpoolctl info:
user_api: blas
internal_api: openblas
num_threads: 16
prefix: libopenblas
filepath: C:\Users\Mavs\Documents\Python\ATOM\venv311\Lib\site-packages\numpy\.libs\libopenblas64__v0.3.21-gcc_10_3_0.dll
version: 0.3.21
threading_layer: pthreads
architecture: Zen
user_api: openmp
internal_api: openmp
num_threads: 16
prefix: vcomp
filepath: C:\Users\Mavs\Documents\Python\ATOM\venv311\Lib\site-packages\sklearn\.libs\vcomp140.dll
version: None
user_api: blas
internal_api: openblas
num_threads: 16
prefix: libopenblas
filepath: C:\Users\Mavs\Documents\Python\ATOM\venv311\Lib\site-packages\scipy.libs\libopenblas_v0.3.20-571-g3dec11c6-gcc_10_3_0-c2315440d6b6cef5037bad648efc8c59.dll
version: 0.3.21.dev
threading_layer: pthreads
architecture: Zen
user_api: openmp
internal_api: openmp
num_threads: 8
prefix: libiomp
filepath: C:\Users\Mavs\Documents\Python\ATOM\venv311\Lib\site-packages\torch\lib\libiomp5md.dll
version: None
user_api: openmp
internal_api: openmp
num_threads: 1
prefix: libiomp
filepath: C:\Users\Mavs\Documents\Python\ATOM\venv311\Lib\site-packages\torch\lib\libiompstubs5md.dll
version: NoneMetadata
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