Xuan-Hieu Phan


2023

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Passage-based BM25 Hard Negatives: A Simple and Effective Negative Sampling Strategy For Dense Retrieval
Thanh-Do Nguyen | Chi Minh Bui | Thi-Hai-Yen Vuong | Xuan-Hieu Phan
Proceedings of the 37th Pacific Asia Conference on Language, Information and Computation

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Joint Learning for Legal Text Retrieval and Textual Entailment: Leveraging the Relationship between Relevancy and Affirmation
Nguyen Hai Long | Thi Hai Yen Vuong | Ha Thanh Nguyen | Xuan-Hieu Phan
Proceedings of the Natural Legal Language Processing Workshop 2023

In legal text processing and reasoning, one normally performs information retrieval to find relevant documents of an input question, and then performs textual entailment to answer the question. The former is about relevancy whereas the latter is about affirmation (or conclusion). While relevancy and affirmation are two different concepts, there is obviously a connection between them. That is why performing retrieval and textual entailment sequentially and independently may not make the most of this mutually supportive relationship. This paper, therefore, propose a multi–task learning model for these two tasks to improve their performance. Technically, in the COLIEE dataset, we use the information of Task 4 (conclusions) to improve the performance of Task 3 (searching for legal provisions related to the question). Our empirical findings indicate that this supportive relationship truly exists. This important insight sheds light on how leveraging relationship between tasks can significantly enhance the effectiveness of our multi-task learning approach for legal text processing.

2007

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A Multilingual Dependency Analysis System Using Online Passive-Aggressive Learning
Le-Minh Nguyen | Akira Shimazu | Phuong-Thai Nguyen | Xuan-Hieu Phan
Proceedings of the 2007 Joint Conference on Empirical Methods in Natural Language Processing and Computational Natural Language Learning (EMNLP-CoNLL)

2006

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Vietnamese Word Segmentation with CRFs and SVMs: An Investigation
Cam-Tu Nguyen | Trung-Kien Nguyen | Xuan-Hieu Phan | Le-Minh Nguyen | Quang-Thuy Ha
Proceedings of the 20th Pacific Asia Conference on Language, Information and Computation

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Semantic Parsing with Structured SVM Ensemble Classification Models
Le-Minh Nguyen | Akira Shimazu | Xuan-Hieu Phan
Proceedings of the COLING/ACL 2006 Main Conference Poster Sessions