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Atsuki Yamaguchi

University of Sheffield

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#artificial intelligence Preprint Sep 2026

Synthetic Pre-pretraining Survives Scale, but Not as a Grammatical Prior

Pre-pretraining (PPT) on synthetic non-natural language data improves token efficiency during language model pre-training (PT). Prior work attributes this gain to a grammatical prior, i.e., a structural inductive bias learned during PPT that transfers to natural language grammar. However, PPT has only been tested on mo...

Atsuki Yamaguchi, Tatsuro Inaba, Joel Niklaus et al. · 0 citations

MultiHashFormer: Hash-based Generative Language Models

This paper proposes MultiHashFormer, a new framework that allows hash-based autoregression that consistently outperforms standard Transformer LMs across multiple benchmarks and shows that the model handles multilingual vocabulary expansion with a constant parameter footprint without any modifications.

Hui Xue, Atsuki Yamaguchi, Nikolaos Aletras · 0 citations
#natural language process... Preprint Aug 2026

When Tokenizers Fail: Byte-Level Chunking for Zero-Shot Transfer to Low-Resource Languages

This paper initializes byte embeddings directly from the subword representations of a frozen base model, applies a chunk alignment loss to project dynamically grouped byte chunks toward precomputed subword targets, and interleave lightweight part-of-speech supervision to guide boundary detection.

Sanjeev Kumar, Atsuki Yamaguchi, Nikolaos Aletras · 1 citation

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