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Replace 4 assert statements used for input validation in SamplingParams with proper TypeError/ValueError exceptions: - assert isinstance(self.stop_token_ids, list) -> TypeError - assert isinstance(self.stop, list) -> TypeError - assert isinstance(self.bad_words, list) -> TypeError - assert self.stop_token_ids is not None -> ValueError assert statements are removed when Python runs with the -O (optimize) flag, which means these validation checks silently disappear in optimized production deployments. This can allow malformed inputs to slip through and cause hard-to-debug failures deeper in the engine. Signed-off-by: jianyexi <jianyxi@microsoft.com> Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Essential Prerequisites
Purpose
Fixes #44798
Replace 4
assertstatements inSamplingParamsthat are used for user input validation with properTypeError/ValueErrorexceptions.Problem
assertstatements are removed when Python runs with-O(optimize) flag. SinceSamplingParamsis in the critical path of every request, this means input validation can silently disappear in production.Changes
_verify_args():566assert isinstance(self.stop_token_ids, list)raise TypeError(...)_verify_args():571assert isinstance(self.stop, list)raise TypeError(...)_verify_args():579assert isinstance(self.bad_words, list)raise TypeError(...)update_from_generation_config():616assert self.stop_token_ids is not Noneraise ValueError(...)All other validations in the same
_verify_args()method already useraise ValueError/raise VLLMValidationError, so this change makes the code consistent with the existing pattern.Impact
TypeErrorwith descriptive message instead of bareAssertionError)python -O— validation is no longer stripped by the optimizerTesting
assertstatements in the file