scikit-learn__scikit-learn-13439
Based on the GitHub issue description, I need to provide a patch for the scikit-learn Pipeline class to implement __len__. Let me create a patch based on the standard scikit-learn codebase structure. The Pipeline class is in…
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Based on the GitHub issue description, I need to provide a patch for the scikit-learn Pipeline class to implement `__len__`. Let me create a patch based on the standard scikit-learn codebase structure. The Pipeline class is in `sklearn/pipeline.py` and I need to add a `__len__` method that returns the number of steps in the pipeline.
Looking at the issue:
- Pipeline supports indexing with `pipe[:len(pipe)]`
- But `len(pipe)` raises an error because `__len__` is not implemented
- The fix is to add a `__len__` method that returns the number of steps
Based on the scikit-learn Pipeline implement
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