Van-Thuy Phi


Relation Classification Using Segment-Level Attention-based CNN and Dependency-based RNN
Van-Hien Tran | Van-Thuy Phi | Hiroyuki Shindo | Yuji Matsumoto
Proceedings of the 2019 Conference of the North American Chapter of the Association for Computational Linguistics: Human Language Technologies, Volume 1 (Long and Short Papers)

Recently, relation classification has gained much success by exploiting deep neural networks. In this paper, we propose a new model effectively combining Segment-level Attention-based Convolutional Neural Networks (SACNNs) and Dependency-based Recurrent Neural Networks (DepRNNs). While SACNNs allow the model to selectively focus on the important information segment from the raw sequence, DepRNNs help to handle the long-distance relations from the shortest dependency path of relation entities. Experiments on the SemEval-2010 Task 8 dataset show that our model is comparable to the state-of-the-art without using any external lexical features.


Ranking-Based Automatic Seed Selection and Noise Reduction for Weakly Supervised Relation Extraction
Van-Thuy Phi | Joan Santoso | Masashi Shimbo | Yuji Matsumoto
Proceedings of the 56th Annual Meeting of the Association for Computational Linguistics (Volume 2: Short Papers)

This paper addresses the tasks of automatic seed selection for bootstrapping relation extraction, and noise reduction for distantly supervised relation extraction. We first point out that these tasks are related. Then, inspired by ranking relation instances and patterns computed by the HITS algorithm, and selecting cluster centroids using the K-means, LSA, or NMF method, we propose methods for selecting the initial seeds from an existing resource, or reducing the level of noise in the distantly labeled data. Experiments show that our proposed methods achieve a better performance than the baseline systems in both tasks.


Integrating Word Embedding Offsets into the Espresso System for Part-Whole Relation Extraction
Van-Thuy Phi | Yuji Matsumoto
Proceedings of the 30th Pacific Asia Conference on Language, Information and Computation: Oral Papers


Exploring a Probabilistic Earley Parser for Event Composition in Biomedical Texts
Mai-Vu Tran | Nigel Collier | Hoang-Quynh Le | Van-Thuy Phi | Thanh-Binh Pham
Proceedings of the BioNLP Shared Task 2013 Workshop