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H. Heidenreich

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Preprint Jul 2026

Where to cut, how deep: BPE and Unigram-LM on chemistry SMILES

Every chemical language model reading SMILES begins with a tokenizer, yet the field has inherited byte-pair encoding (BPE) from natural language with little scrutiny. In natural language, BPE's principal alternative, Unigram-LM, is known to build structurally different vocabularies. Whether that contrast survives in ch...

H. Heidenreich · 0 citations

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