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Fix local_score_BDeu KeyError on pandas >= 2.0 #267

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kunwuz merged 1 commit into from
Jun 20, 2026
+7 −1
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Fix local_score_BDeu KeyError on pandas >= 2.0 #267

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8 changes: 7 additions & 1 deletion causallearn/score/LocalScoreFunction.py
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Original file line number Diff line number Diff line change
Expand Up @@ -196,7 +196,13 @@ def local_score_BDeu(Data: ndarray, i: int, PAi: List[int], parameters=None) ->
# calculate N_{ijk}: for each parent config, count occurrences of each X_i value
Nijk_map = {}
for ij in Nij_map_keys_list:
group = Data_pd_group_Nij.get_group((ij,) if not isinstance(ij, tuple) else ij)
# For a single grouper, pandas >= 2.0 expects the scalar key while
# older pandas accepted a 1-tuple; try the scalar first and fall
# back so BDeu works across pandas versions.
try:
group = Data_pd_group_Nij.get_group(ij)
except (KeyError, ValueError):
group = Data_pd_group_Nij.get_group((ij,) if not isinstance(ij, tuple) else ij)
counts = group[xi_col].value_counts().reset_index()
counts.columns = [xi_col, "times"]
Nijk_map[ij] = counts
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