Fix Whisper genai_config context_length using wrong config attribute#28600
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WhisperConfig does not have a max_length attribute. Accessing config.max_length falls back to the PretrainedConfig default (20) in some transformers versions, causing a runtime error: 'max_length (448) cannot be greater than model context_length (20)' Use config.max_target_positions (always 448 for Whisper) instead, which is the correct decoder sequence length for all Whisper variants. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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kunal-vaishnavi
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May 21, 2026
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Description
WhisperConfigdoes not have amax_lengthattribute. Accessingconfig.max_lengthfalls back to thePretrainedConfigdefault (20) in some transformers versions, causing a runtime error:Fix
Use
config.max_target_positions(always 448 for all Whisper variants) instead ofconfig.max_lengthfor bothcontext_lengthandsearch.max_lengthin the generatedgenai_config.json.Testing
Verified that
max_target_positionsis correctly set to 448 for whisper-tiny, whisper-medium, and whisper-large-v3-turbo.