Fix BigBench multiple-choice crash on mixed-format tasks#3702
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Chessing234 wants to merge 1 commit intoEleutherAI:mainfrom
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Fix BigBench multiple-choice crash on mixed-format tasks#3702Chessing234 wants to merge 1 commit intoEleutherAI:mainfrom
Chessing234 wants to merge 1 commit intoEleutherAI:mainfrom
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Some BigBench subtasks (e.g. kanji_ascii) contain a mix of multiple-choice and free-form examples in the same dataset split. The multiple-choice templates crash with a ValueError when they encounter rows where `multiple_choice_targets` is an empty list. Add a `process_docs` filter that drops rows without multiple-choice targets before evaluation. Fixes EleutherAI#3636 Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Bug
BigBench multiple-choice tasks crash with
ValueErroron subtasks that contain a mix of multiple-choice and free-form examples in the same dataset split (e.g.kanji_ascii).The Jinja template
{{multiple_choice_targets.index(targets[0])}}raisesValueError: 'u' is not in list(or similar) when it encounters a row wheremultiple_choice_targetsis an empty list.Root cause
generate_tasks.pydecides whether a subtask qualifies as multiple-choice by checking only the first example. Subtasks likekanji_asciihave multiple-choice examples at the start but free-form examples later (index 188+), wheremultiple_choice_targetsandmultiple_choice_scoresare both[].Fix
Add a
process_docsfilter to both multiple-choice template YAMLs that drops rows with emptymultiple_choice_targetsbefore evaluation. This follows the same pattern used by other tasks in the repo (e.g.crows_pairs,bbq).Three files changed:
lm_eval/tasks/bigbench/utils.py— one filter functionmultiple_choice_template_a_yaml— addedprocess_docslinemultiple_choice_template_b_yaml— addedprocess_docslineFixes #3636