Handle tokenizer configs without tokenizer_class#2278
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June 25, 2026 13:17
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What changed
This updates
Tokenizerto treattokenizer_classintokenizer_config.jsonas optional when deciding whether to apply the single-token LLaMA decoding workaround.Why
A tokenizer directory can include a valid
tokenizer.jsonand a minimaltokenizer_config.jsonthat does not definetokenizer_class. In that case, initialization currently raises aKeyErroreven though the tokenizer can otherwise be loaded.Validation
python -m pytest tests/test_tokenizer.py::test_tokenizer_config_without_tokenizer_class tests/test_tokenizer.py::test_tokenizer_bos_eos tests/test_tokenizer.py::test_tokenizer_input_validation -qpython -m ruff check litgpt\tokenizer.py tests\test_tokenizer.py