Fix spurious warning from type_of_target when called on estimator.classes_ #31584
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Reference Issues/PRs
Fixes #31583
What does this implement/fix? Explain your changes.
This PR suppresses an unintended warning in get_response_values, where type_of_target is called on estimator.classes_. Since classes_ does not represent full sample-level data, this call may spuriously trigger the warning:
"The number of unique classes is greater than 50% of the number of samples."
This is now avoided by passing suppress_warning=True to type_of_target() at this specific location.
This patch is intentionally minimal and does not affect calls to type_of_target that operate on actual sample labels (y, y_true, etc.).
Any other comments?
This was first observed while calibrating classifiers with many classes. Although the dataset was large and well-balanced, the warning appeared due to how classes_ was passed into type_of_target.
Apologies in advance if this is already known or intentional – this is my first contribution here, and I appreciate any feedback or corrections.
Thanks for your time and for maintaining this great library!