GenAI4ELab/papercli-papers huggingface dataset:
Evaluating Evaluation Metrics for Ancient Chinese to English Machine Translation
Authors: Eric R. Bennett; HyoJung Han; Xinchen Yang; Andrew Schonebaum; Marine Carpuat
Venue: NAACL 2025 (Proceedings of the Second Workshop on Ancient Language Processing)

Abstract: Evaluation metrics are an important driver of progress in Machine Translation (MT), but they have been primarily validated on high-resource modern languages. In this paper, we conduct an empirical evaluation of metrics commonly used to evaluate MT from Ancient Chinese into English. Using LLMs, we construct a contrastive test set, pairing high-quality MT and purposefully flawed MT of the same Pre-Qin texts. We then evaluate the ability of each metric to discriminate between accurate and flawed translations.
From Clay to Code: Transforming Hittite Texts for Machine Learning
Authors: Emma Yavasan; Shai Gordin
Venue: NAACL 2025 (Proceedings of the Second Workshop on Ancient Language Processing)

Abstract: This paper presents a comprehensive method-ology for transforming XML-encoded Hittite cuneiform texts into computationally accessi-ble formats for machine learning applications. Drawing from a corpus of 8,898 texts (558,349 tokens in total) encompassing 145 cataloged genres and compositions, we develop a struc-tured approach to preserve both linguistic and philological annotations while enabling compu-tational analysis. Our methodology addresses key challenges in ancient language processing, including the handling of fragmentary texts, multiple language layers, and complex anno-tation systems. We demonstrate the applica-tion of our corpus through experiments with T5 models, achieving significant improvements in Hittite-to-German translation (ROUGE-1: 0.895) while identifying limitations in morpho-logical glossing tasks. This work establishes a standardized, machine-readable dataset in Hit-tite cuneiform, which also maintains a balance with philological accuracy and current state-of-the-art.
Towards Ancient Meroitic Decipherment: A Computational Approach
Authors: Joshua Otten; Antonios Anastasopoulos
Venue: NAACL 2025 (Proceedings of the Second Workshop on Ancient Language Processing)

Abstract: The discovery of the Rosetta Stone was one of the keys that helped unlock the secrets of Ancient Egypt and its hieroglyphic lan-guage. But what about languages with no such “Rosetta Stone?” Meroitic is an ancient lan-guage from what is now present-day Sudan, but even though it is connected to Egyptian in many ways, much of its grammar and vocabu-lary remains undeciphered. In this work, we in-troduce the challenge of Meroitic decipherment as a computational task, and present the first Meroitic machine-readable corpus. We then train embeddings and perform intrinsic evalu-ations, as well as cross-lingual alignment ex-periments between Meroitic and Late-Egyptian. We conclude by outlining open problems and potential research directions.
Neural Models for Lemmatization and POS-Tagging of Earlier and Late Egyptian (Supporting Hieroglyphic Input) and Demotic
Authors: Aleksi Sahala; Eliese-Sophia Lincke
Venue: NAACL 2025 (Proceedings of the Second Workshop on Ancient Language Processing)

Abstract: We present updated models for BabyLemma-tizer for lemmatizing and POS-tagging De-motic, Late Egyptian and Earlier Egyptian with a support for using hieroglyphs as an input. In this paper, we also use data that has not been cleaned from breakages. We achieve consistent UPOS tagging accuracy of 94% or higher and an XPOS tagging accuracy of 93% and higher for all languages. For lemmatization, which is challenging in all of our test languages due to extensive ambiguity, we demonstrate accu-racies from 77% up to 92% depending on the language and the input script.
Bringing Suzhou Numerals into the Digital Age: A Dataset and Recognition Study on Ancient Chinese Trade Records
Authors: Ting-Lin Wu; Zih-Ching Chen; Chen-Yuan Chen; Pi-Jhong Chen; Li-Chiao Wang
Venue: NAACL 2025 (Proceedings of the Second Workshop on Ancient Language Processing)

Abstract: Suzhou numerals, a specialized numerical no-tation system historically used in Chinese com-merce and accounting, played a pivotal role in financial transactions from the Song Dynasty to the early 20th century. Despite their his-torical significance, they remain largely absent from modern OCR benchmarks, limiting com-putational access to archival trade documents. This paper presents a curated dataset of 773 expert-annotated Suzhou numeral samples ex-tracted from late Qing-era trade ledgers. We provide a statistical analysis of character distri-butions, offering insights into their real-world usage in historical bookkeeping. Additionally, we evaluate baseline performance with hand-written text recognition (HTR) model, high-lighting the challenges of recognizing low-resource brush-written numerals. By introduc-ing this dataset and initial benchmark results, we aim to facilitate research in historical doc-umentation in ancient Chinese characters, ad-vancing the digitization of early Chinese finan-cial records. The dataset is publicly available at our huggingface hub, and our codebase can be accessed at our github repository.
Detecting Honkadori based on Waka Embeddings
Authors: Hayato Ogawa; Kaito Horio; Daisuke Kawahara
Venue: NAACL 2025 (Proceedings of the Second Workshop on Ancient Language Processing)

Abstract: We develop an embedding model specifically designed for Waka poetry and use it to build a model for detecting Honkadori. Waka is a tradi-tional form of old Japanese poetry that has been composed since ancient times. Honkadori is a sophisticated poetic technique in Japanese clas-sical literature where poets incorporate words or poetic sentiments from old Wakas (Honka) into their own work. First, we fine-tune a pre-trained language model using contrastive learn-ing to construct a Waka-specialized embedding model. Then, using the embedding vectors ob-tained from this model and features extracted from them, we train a machine learning model to detect the Honka (original poem) of Wakas that employ the Honkadori technique. Using paired data of Honka and Wakas that are consid-ered to use Honkadori, we evaluated the Honka detection model and demonstrated that it can detect Honka with reasonable accuracy.
The Historian’s Fingerprint: A Computational Stylometric Study of the Zuo Commentary and Discourses of the States
Authors: Wenjie Hua
Venue: NAACL 2025 (Proceedings of the Second Workshop on Ancient Language Processing)

Abstract: Previous studies suggest that authorship can be inferred through stylistic features like func-tion word usage and grammatical patterns, yet such analyses remain limited for Old Chinese texts with disputed authorship. Computational methods enable a more nuanced exploration of these texts. This study applies stylometric anal-ysis to examine the authorship controversy be-tween the Zuo Commentary and the Discourses of the States. Using PoS 4-grams, Kullback-Leibler divergence, and multidimensional scal-ing (MDS), we systematically compare their stylistic profiles. Results show that the Zuo Commentary exhibits high internal consistency, especially in the later eight Dukes chapters, supporting its integration by a single scholarly tradition. In contrast, the Discourses of the States displays greater stylistic diversity, align-ing with the multiple-source compilation the-ory. Further analysis reveals partial stylistic similarities among the Lu, Jin, and Chu-related chapters, suggesting shared influences. These findings provide quantitative support for Tong Shuye’s arguments and extend statistical vali-dation of Bernhard Karlgren’s assertion on the textual unity of the Zuo Commentary.
Incorporating Lexicon-Aligned Prompting in Large Language Model for Tangut–Chinese Translation
Authors: Yuxi Zheng; Jingsong Yu
Venue: NAACL 2025 (Proceedings of the Second Workshop on Ancient Language Processing)

Abstract: This paper proposes a machine translation approach for Tangut–Chinese using a large language model (LLM) enhanced with lexical knowledge. We fine-tune a Qwen-based LLM using Tangut–Chinese parallel corpora and dictionary definitions. Experimental results demonstrate that incorporating single-character dictionary definitions leads to the best BLEU-4 score of 72.33 for literal translation. Additionally, applying a chain-of-thought prompting strategy significantly boosts free translation performance to 64.20. The model also exhibits strong few-shot learning abilities, with performance improving as the training dataset size increases. Our approach effectively translates both simple and complex Tangut sentences, offering a robust solution for low-resource language translation and contributing to the digital preservation of Tangut texts.
ParsiPy: NLP Toolkit for Historical Persian Texts in Python
Authors: Farhan Farsi; Parnian Fazel; Sepand Haghighi; Sadra Sabouri; Farzaneh Goshtasb; Nadia Hajipour; Ehsaneddin Asgari; Hossein Sameti
Venue: NAACL 2025 (Proceedings of the Second Workshop on Ancient Language Processing)

Abstract: The study of historical languages presents unique challenges due to their complex ortho-graphic systems, fragmentary textual evidence, and the absence of standardized digital repre-sentations of text in those languages. Tack-ling these challenges needs special NLP digi-tal tools to handle phonetic transcriptions and analyze ancient texts. This work introduces ParsiPy1, an NLP toolkit designed to facili-tate the analysis of historical Persian languages by offering modules for tokenization, lemma-tization, part-of-speech tagging, phoneme-to-transliteration conversion, and word embed-ding. We demonstrate the utility of our toolkit through the processing of Parsig (Middle Per-sian) texts, highlighting its potential for ex-panding computational methods in the study of historical languages. Through this work, we contribute to the field of computational philol-ogy, offering tools that can be adapted for the broader study of ancient texts and their digital preservation.
Exploring the Application of 7B LLMs for Named Entity Recognition in Chinese Ancient Texts
Authors: Chenrui Zheng; Yicheng Zhu; Han Bi
Venue: NAACL 2025 (Proceedings of the Second Workshop on Ancient Language Processing)

Abstract: This paper explores the application of fine-tuning methods based on 7B large language models (LLMs) for named entity recognition (NER) tasks in Chinese ancient texts. Targeting the complex semantics and domain-specific characteristics of ancient texts, particularly in Traditional Chinese Medicine (TCM) texts, we propose a comprehensive fine-tuning and pre-training strategy. By introducing multi-task learning, domain-specific pre-training, and efficient fine-tuning techniques based on LoRA, we achieved significant performance improvements in ancient text NER tasks. Experimental results show that the pre-trained and fine-tuned 7B model achieved an F1 score of 0.93, significantly outperforming general-purpose large language models.
Overview of EvaHan2025: The First International Evaluation on Ancient Chinese Named Entity Recognition
Authors: Bin Li; Bolin Chang; Ruilin Liu; Xue Zhao; Si Shen; Lihong Liu; Yan Zhu; Zhixing Xu; Weiguang Qu; Dongbo Wang
Venue: NAACL 2025 (Proceedings of the Second Workshop on Ancient Language Processing)

Abstract: Ancient Chinese books have great values in history and cultural studies. Named en-tities like person, location, time are cru-cial elements, thus automatic Named En-tity Recognition (NER) is considered a ba-sic task in ancient Chinese text processing. This paper introduces EvaHan2025, the first international ancient Chinese Named Entity Recognition bake-off. The evalua-tion introduces a rigorous benchmark for assessing NER performance across histori-cal and medical texts, covering 12 named entity types. A total of 13 teams par-ticipated in the competition, submitting 77 system runs. In the closed modality, where participants were restricted to us-ing only the training data, the highest F1 scores reached 85.04% on TestA and 90.28% on TestB, both derived from his-torical texts, while performance on medi-cal texts (TestC) reached 84.49%. The re-sults indicate that text genre significantly impacts model performance, with histori-cal texts generally yielding higher scores. Additionally, the intrinsic characteristics of named entities also influence recogni-tion performance. These findings high-light the challenges and opportunities in ancient Chinese NER and underscore the importance of domain adaptation and en-tity type diversity in future research.
Construction of NER Model in Ancient Chinese: Solution of EvaHan 2025 Challenge
Authors: Yi Lu; Minyi Lei
Venue: NAACL 2025 (Proceedings of the Second Workshop on Ancient Language Processing)

Abstract: This paper introduces the system submit-ted for EvaHan 2025, focusing on the Named Entity Recognition (NER) task for ancient Chinese texts. Our solution is built upon two specified pre-trained BERT models, namely GujiRoBERTa_jian_fan and GujiRoBERTa_fan, and further en-hanced by a deep BiLSTM network with a Conditional Random Field (CRF) decod-ing layer. Extensive experiments on three test dataset splits demonstrate that our system’s performance, 84.58% F1 in the closed-modality track and 82.78% F1 in the open-modality track, significantly out-performs the official baseline, achieving no-table improvements in F1 score.
LLM’s Weakness in NER Doesn’t Stop It from Enhancing a Stronger SLM
Authors: Weilu Xu; Renfei Dang; Shujian Huang
Venue: NAACL 2025 (Proceedings of the Second Workshop on Ancient Language Processing)

Abstract: Large Language Models (LLMs) demonstrate strong semantic understanding ability and extensive knowledge, but struggle with Named Entity Recognition (NER) due to hallucination and high training costs. Meanwhile, supervised Small Language Models (SLMs) efficiently provide structured predictions but lack adaptability to unseen entities and complex contexts. In this study, we investigate how a relatively weaker LLM can effectively support a supervised model in NER tasks. We first improve the LLM using LoRA-based fine-tuning and similarity-based prompting, achieving performance comparable to a SLM baseline. To further improve results, we propose a fusion strategy that integrates both models: prioritising SLM’s predictions while using LLM guidance in low confidence cases. Our hybrid approach outperforms both baselines on three classic Chinese NER datasets.
Named Entity Recognition in Context: Edit_Dunhuang team Technical Report for Evahan2025 NER Competition
Authors: Colin Brisson; Ayoub Kahfy; Marc Bui; Frédéric Constant
Venue: NAACL 2025 (Proceedings of the Second Workshop on Ancient Language Processing)

Abstract: We present the Named Entity Recognition sys-tem developed by the Edit Dunhuang team for the EvaHan2025 competition. Our approach in-tegrates three core components: (1) Pindola, a modern transformer-based bidirectional en-coder pretrained on a large corpus of Classi-cal Chinese texts; (2) a retrieval module that fetches relevant external context for each target sequence; and (3) a generative reasoning step that summarizes retrieved context in Classical Chinese for more robust entity disambiguation. Using this approach, we achieve an average F1 score of 85.58, improving upon the competition baseline by nearly 5 points.
Make Good Use of GujiRoBERTa to Identify Entities in Ancient Chinese
Authors: Lihan Lin; Yiming Wang; Jiachen Li; Huan Ouyang; Si Li
Venue: NAACL 2025 (Proceedings of the Second Workshop on Ancient Language Processing)

Abstract: This report describes our model submitted for the EvaHan 2025 shared task on named entity recognition for ancient Chinese literary works. Since we participated in the task of closed modality, our method is based on the appointed pretrained language model GujiRoBERTajian-fan and we used appointed datasets.We carried out experiments on decodingstrategies and schedulers to verify the effect of our method. In the final test, our method outperformed the official baseline, demonstrating its effectiveness. In the end, for the results, this report gives an analysis from the perspective of data composition.
GRoWE: A GujiRoBERTa-Enhanced Approach to Ancient Chinese NER via Word-Word Relation Classification and Model Ensembling
Authors: Tian Xia; Yilin Wang; Xinkai Wang; Yahe Yang; Qun Zhao; Menghui Yang
Venue: NAACL 2025 (Proceedings of the Second Workshop on Ancient Language Processing)

Abstract: Named entity recognition is a fundamental task in ancient Chinese text analysis.Based on the pre-trained language model of ancient Chinese texts, this paper proposes a new named entity recognition method GRoWE. It uses the ancient Chinese texts pre-trained language model GujiRoBERTa as the base model, and the wordword relation prediction model is superposed upon the base model to construct a superposition model. Then ensemble strategies are used to multiple superposition models. On the EvaHan 2025 public test set, the F1 value of the proposed method reaches 86.79%, which is 6.18% higher than that of the mainstream BERT_LSTM_CRF baseline model, indicating that the model architecture and ensemble strategy play an important role in improving the recognition effect of naming entities in ancient Chinese texts.
When Less Is More: Logits-Constrained Framework with RoBERTa for Ancient Chinese NER
Authors: Wenjie Hua; Shenghan Xu
Venue: NAACL 2025 (Proceedings of the Second Workshop on Ancient Language Processing)

Abstract: This report presents our team’s work on ancient Chinese Named Entity Recognition (NER) for EvaHan 20251. We propose a two-stage framework combining GujiRoBERTa with a Logits-Constrained (LC) mechanism. The first stage generates contextual embeddings using GujiRoBERTa, followed by dynamically masked decoding to enforce valid BMES transitions. Experiments on EvaHan 2025 datasets demonstrate the framework’s effectiveness. Key findings include the LC framework’s superiority over CRFs in high-label scenarios and the detrimental effect of BiLSTM modules. We also establish empirical model selection guidelines based on label complexity and dataset size.
Lemmatization of Cuneiform Languages Using the ByT5 Model
Authors: Pengxiu Lu; Yonglong Huang; Jing Xu; Minxuan Feng; Chao Xu
Venue: NAACL 2025 (Proceedings of the Second Workshop on Ancient Language Processing)

Abstract: Lemmatization of cuneiform languages presents a unique challenge due to their complex writing system, which combines syllabic and logographic elements. In this study, we investigate the effectiveness of the ByT5 model in addressing this challenge by developing and evaluating a ByT5-based lemmatization system. Experimental results demonstrate that ByT5 outperforms mT5 in this task, achieving an accuracy of 80.55% on raw lemmas and 82.59% on generalized lemmas, where sense numbers are removed. These findings highlight the potential of ByT5 for lemmatizing cuneiform languages and provide useful insights for future work on ancient text lemmatization.
Simple Named Entity Recognition (NER) System with RoBERTa for Ancient Chinese
Authors: Yunmeng Zhang; Meiling Liu; Hanqi Tang; Shige Lu; Lang Xue
Venue: NAACL 2025 (Proceedings of the Second Workshop on Ancient Language Processing)

Abstract: Named Entity Recognition (NER) is a fun-damental task in Natural Language Process-ing (NLP), particularly in the analysis of Chi-nese historical texts. In this work, we pro-pose an innovative NER model based on Gu-jiRoBERTa, incorporating Conditional Ran-dom Fields (CRF) and Long Short Term Mem-ory Network(LSTM) to enhance sequence la-beling performance. Our model is evaluated on three datasets from the EvaHan2025 competi-tion, demonstrating superior performance over the baseline model, SikuRoBERTa-BiLSTM-CRF. The proposed approach effectively cap-tures contextual dependencies and improves entity boundary recognition. Experimental re-sults show that our method achieves consistent improvements across almost all evaluation met-rics, highlighting its robustness and effective-ness in handling ancient Chinese texts.
Multi-Strategy Named Entity Recognition System for Ancient Chinese
Authors: Wenxuan Dong; Meiling Liu
Venue: NAACL 2025 (Proceedings of the Second Workshop on Ancient Language Processing)

Abstract: We present a multi-strategy Named Entity Recognition (NER) system for ancient Chi-nese texts in EvaHan2025. Addressing dataset heterogeneity, we use a Conditional Random Field (CRF) for Tasks A and C to handle six entity types’ complex dependencies, and a lightweight Softmax classifier for Task B’s simpler three-entity tagset. Ablation studies on training data confirm CRF’s superiority in capturing sequence dependencies and Softmax’s computational advantage for simpler tasks. On blind tests, our system achieves F1-scores of 83.94%, 88.31%, and 82.15% for Test A, B, and C—outperforming baselines by 2.46%, 0.81%, and 9.75%. With an overall F1 improvement of 4.30%, it excels across historical and medical domains. This adaptability enhances knowledge extraction from ancient texts, offering a scalable NER framework for low-resource, complex languages.
Finetuning LLMs for EvaCun 2025 token prediction shared task
Authors: Josef Jon; Ondřej Bojar
Venue: NAACL 2025 (Proceedings of the Second Workshop on Ancient Language Processing)

Abstract: In this paper, we present our submission for the token prediction task of EvaCun 2025. Our sys-tems are based on LLMs (Command-R, Mistral, and Aya Expanse) fine-tuned on the task data provided by the organizers. As we only pos-sess a very superficial knowledge of the subject field and the languages of the task, we simply used the training data without any task-specific adjustments, preprocessing, or filtering. We compare 3 different approaches (based on 3 different prompts) of obtaining the predictions, and we evaluate them on a held-out part of the data.
Beyond Base Predictors: Using LLMs to Resolve Ambiguities in Akkadian Lemmatization
Authors: Frederick Riemenschneider
Venue: NAACL 2025 (Proceedings of the Second Workshop on Ancient Language Processing)

Abstract: We present a hybrid approach for Akkadian lemmatization in the EvaCun 2025 Shared Task that combines traditional NLP techniques with large language models (LLMs). Our system employs three Base Predictors–a dictionary lookup and two T5 models–to establish initial lemma candidates. For cases where these pre-dictors disagree (18.72% of instances), we im-plement an LLM Resolution module, enhanced with direct access to the electronic Babylonian Library (eBL) dictionary entries. This module includes a Predictor component that generates initial lemma predictions based on dictionary information, and a Validator component that refines these predictions through contextual rea-soning. Error analysis reveals that the system struggles most with small differences (like cap-italization) and certain ambiguous logograms (like BI). Our work demonstrates the benefits of combining traditional NLP approaches with the reasoning capabilities of LLMs when provided with appropriate domain knowledge.