fix(llm_judge): use last-match for verdict extraction in single and pairwise judging - #3921
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fix(llm_judge): use last-match for verdict extraction in single and pairwise judging#3921AUTHENSOR wants to merge 1 commit into
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…ngle/pair run_judge_single used re.search (first-match) for [[rating]] extraction. run_judge_pair used substring 'in' checks (A checked before B before C). Both allow an early verdict token in reasoning text to override the judge's final verdict. Switch to findall + last-match.
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Summary
The LLM judge in
fastchat/llm_judge/common.pyextracts verdicts using first-match parsing:run_judge_single(line 176):re.search(one_score_pattern, judgment)returns the first[[N]]match. If the judge reasons about scores before its final verdict, the first match may be from reasoning text, not the verdict.run_judge_pair(line 283):if "[[A]]" in judgmentsubstring checks in A-before-B-before-C order. A response containing[[A]]in reasoning and[[B]]as the verdict selects A (first match).Fix
re.searchwithre.findalland take the last match (matches[-1]).insubstring chain withre.findall(r"\[\[([ABC])\]\]", judgment.upper())[-1].[[rating_a,rating_b]]): Same findall + last-match treatment.This matches the convention used by other eval frameworks (inspect_ai
DEFAULT_GRADE_PATTERNuses a greedy prefix to bind to the last verdict; openai/evalscot_classifyreverses lines).Verification
black --check: clean (no formatting changes needed)