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Lost in Space Marking

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arxiv 2208.01561 v1 pith:73UFGPNJ submitted 2022-08-02 cs.CL

classification cs.CL
keywords markingtexttokentokenizertrainedword-initialacrossbenefits
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We look at a decision taken early in training a subword tokenizer, namely whether it should be the word-initial token that carries a special mark, or the word-final one. Based on surface-level considerations of efficiency and cohesion, as well as morphological coverage, we find that a Unigram LM tokenizer trained on pre-tokenized English text is better off marking the word-initial token, while one trained on raw text benefits from marking word ends. Our findings generalize across domains.

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Cited by 1 Pith paper

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  1. ByteSpan: Information-Driven Subword Tokenisation

    cs.CL 2025-06 conditional novelty 6.0 of 10

    A tokeniser that groups predictable bytes using a byte-level LM's surprisal or entropy achieves higher morphological alignment than BPE without loss of compression.

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