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Nikolaos Aletras

University of Sheffield

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#natural language process... Preprint Sep 2026

How Much is a Human Right Worth? ECtHR-NPD: A Benchmark for Predicting Non-Pecuniary Damage Awards

Existing legal benchmarks cover diverse tasks, while continuous monetary remedies remain comparatively underexplored. We introduce ECtHR-NPD, to the best of our knowledge, the first benchmark for predicting non-pecuniary damage (NPD) awards at the European Court of Human Rights (ECtHR) from case information when no sta...

Yanyi Pu, Damián A. González-Salzberg, Zheng Yuan et al. · 0 citations
#artificial intelligence Preprint Sep 2026

Evaluating and Improving Evidence-Grounded Fact-Checking in LLMs via Multi-Round Evidence Ablation

Fact-Ablated Evaluation (FAE) is introduced, a new evaluation framework that iteratively ablates the cited evidence to assess whether LLMs revise their predictions accordingly and highlights that strong fact-checking performance can still coexist with weak evidence dependency, while REAL encourages veracity predictions...

Xing-Yu Deng, Mingzi Cao, Nikolaos Aletras 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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