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Compatibility patch to support scikit-learn 1.7 #611

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Merged
hcho3 merged 1 commit into from
Jun 6, 2025
Merged

Compatibility patch to support scikit-learn 1.7 #611

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13 changes: 11 additions & 2 deletions python/treelite/sklearn/importer.py
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Original file line number Diff line number Diff line change
Expand Up @@ -340,7 +340,7 @@ def import_model(sklearn_model) -> Model:


def _import_hist_gradient_boosting(sklearn_model) -> Model:
# pylint: disable=R0914,W0212,too-many-branches
# pylint: disable=R0914,W0212,too-many-branches,too-many-statements
"""Load HistGradientBoostingClassifier / HistGradientBoostingRegressor"""
from sklearn.ensemble import HistGradientBoostingClassifier as HistGradientBoostingC
from sklearn.ensemble import HistGradientBoostingRegressor as HistGradientBoostingR
Expand All @@ -360,12 +360,21 @@ def _import_hist_gradient_boosting(sklearn_model) -> Model:
and getattr(sklearn_model, "_preprocessor", None) is not None
):
# Ensure that the model's internals did not change
assert len(sklearn_model._preprocessor.transformers_) == 2
assert len(sklearn_model._preprocessor.transformers_) >= 2
assert len(sklearn_model._preprocessor.transformers_[0]) == 3
assert len(sklearn_model._preprocessor.transformers_[1]) == 3
assert sklearn_model._preprocessor.transformers_[0][0] == "encoder"
assert sklearn_model._preprocessor.transformers_[1][0] == "numerical"

if parse_version(sklearn_version) >= parse_version("1.7.0"):
assert len(sklearn_model._preprocessor.transformers_) == 3
assert len(sklearn_model._preprocessor.transformers_[2]) == 3
assert sklearn_model._preprocessor.transformers_[2][0] == "remainder"
assert sklearn_model._preprocessor.transformers_[2][1] == "drop"
assert all(
e is False for e in sklearn_model._preprocessor.transformers_[2][2]
)

for cats in sklearn_model._preprocessor.transformers_[0][1].categories_:
if cats.dtype.type is np.str_:
raise NotImplementedError("String categories are not supported")
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