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Fix: Comprehensive XGBoost 2.0+ base_score compatibility (NoneType & List parsing) for high-performance transpilation #598

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Fix: Comprehensive XGBoost 2.0+ base_score compatibility (NoneType & List parsing) for high-performance transpilation #598

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10 changes: 9 additions & 1 deletion m2cgen/assemblers/boosting.py
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Original file line number Diff line number Diff line change
Expand Up @@ -77,7 +77,15 @@ def _assemble_bin_class_output(self, estimator_params):
# return -logf(1.0f / base_score - 1.0f);
base_score = 0.0
if self._base_score != 0.0:
base_score = -math.log(1.0 / self._base_score - 1.0)
#base_score = -math.log(1.0 / self._base_score - 1.0)
# Extract base_score properly for XGBoost 2.0+ compatibility
current_score = self._base_score
if current_score is None:
current_score = 0.5
elif isinstance(current_score, list):
current_score = current_score[0]

base_score = -math.log(1.0 / current_score - 1.0)

expr = self._assemble_single_output(estimator_params, base_score=base_score)

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