Validate tokenizer compatibility in Gemma4Sampler - #787
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sylvesterkaczmarek wants to merge 2 commits into
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Validate tokenizer compatibility in Gemma4Sampler#787sylvesterkaczmarek wants to merge 2 commits into
sylvesterkaczmarek wants to merge 2 commits into
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Summary
Gemma4Sampleraccepted an explicitly supplied tokenizer without checking that itsVERSIONmatchedmodel.INFO.tokenizer_version. This differs fromSamplerand can allow incompatible token IDs and special tokens into sampling.This adds the same compatibility validation already used by
Samplerand a regression test that verifies a Gemma 4 model rejects a version-3 tokenizer.Testing
gemma/gm/text/_gemma4_sampler_test.py::test_rejects_incompatible_tokenizer