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feat: load GPTNeoXTokenizer checkpoints (OLMoE) - #230
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swift-transformers has no GPTNeoXTokenizer entry and throws before the server starts. When tokenizer.json is BPE, load it from a scratch copy whose tokenizer_config.json says GPT2Tokenizer. Verified end to end on OLMoE-1B-7B-0125-Instruct-4bit. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
This was referenced Oct 12, 2026
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OLMoE ships
tokenizer_class: GPTNeoXTokenizer. swift-transformers has no such entry (the table is internal, no register API), so the server exits withunsupportedTokenizer("GPTNeoXTokenizer")before it starts.When
tokenizer.jsonismodel.type == "BPE"and the declared class (Faststripped) is GPTNeoXTokenizer, load it from a scratch dir (symlinks + rewrittentokenizer_config.jsonsayingGPT2Tokenizer), same pattern as the existing Unigram remap. Non-BPE or already-known classes are left alone; any error falls back to the original directory. Logs one line when it fires.Verified (Swift 6.2 clone, release build): OLMoE-1B-7B-0125-Instruct-4bit loads and answers "Paris" to the capital-of-France prompt. 5 new unit tests in
TokenizerClassRemapTestspass (remap, Fast suffix, known class untouched, non-BPE untouched, missing class untouched).🤖 Generated with Claude Code