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scikit-learn__scikit-learn-25747

Based on the GitHub issue description and traceback, I can analyze the problem directly. The issue is in sklearn/utils/_set_output.py in the _wrap_in_pandas_container function. Let me analyze the traceback:

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Content

Based on the GitHub issue description and traceback, I can analyze the problem directly. The issue is in `sklearn/utils/_set_output.py` in the `_wrap_in_pandas_container` function. Let me analyze the traceback:

1. The error occurs in `_wrap_in_pandas_container` at line 59: `data_to_wrap.index = index`
2. The problem is when a transformer returns a DataFrame with a different number of rows (aggregated data), the code tries to assign the original input's index to the output DataFrame
3. This fails because the number of elements don't match (4 elements in output vs 96 in original input)

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