Search Results for author: Samuel Mensah

Found 7 papers, 2 papers with code

Trading Syntax Trees for Wordpieces: Target-oriented Opinion Words Extraction with Wordpieces and Aspect Enhancement

no code implementations18 May 2023 Samuel Mensah, Kai Sun, Nikolaos Aletras

State-of-the-art target-oriented opinion word extraction (TOWE) models typically use BERT-based text encoders that operate on the word level, along with graph convolutional networks (GCNs) that incorporate syntactic information extracted from syntax trees.

Sentence target-oriented opinion words extraction

Self-training through Classifier Disagreement for Cross-Domain Opinion Target Extraction

no code implementations28 Feb 2023 Kai Sun, Richong Zhang, Samuel Mensah, Nikolaos Aletras, Yongyi Mao, Xudong Liu

Inspired by the theoretical foundations in domain adaptation [2], we propose a new SSL approach that opts for selecting target samples whose model output from a domain-specific teacher and student network disagree on the unlabelled target data, in an effort to boost the target domain performance.

Aspect Extraction Domain Adaptation +1

A Hierarchical N-Gram Framework for Zero-Shot Link Prediction

1 code implementation16 Apr 2022 Mingchen Li, Junfan Chen, Samuel Mensah, Nikolaos Aletras, Xiulong Yang, Yang Ye

Thus, in this paper, we propose a Hierarchical N-Gram framework for Zero-Shot Link Prediction (HNZSLP), which considers the dependencies among character n-grams of the relation surface name for ZSLP.

Knowledge Graphs Link Prediction +1

An Empirical Study on Leveraging Position Embeddings for Target-oriented Opinion Words Extraction

1 code implementation EMNLP 2021 Samuel Mensah, Kai Sun, Nikolaos Aletras

Target-oriented opinion words extraction (TOWE) (Fan et al., 2019b) is a new subtask of target-oriented sentiment analysis that aims to extract opinion words for a given aspect in text.

Position target-oriented opinion words extraction +1

Recurrent Interaction Network for Jointly Extracting Entities and Classifying Relations

no code implementations EMNLP 2020 Kai Sun, Richong Zhang, Samuel Mensah, Yongyi Mao, Xudong Liu

The idea of using multi-task learning approaches to address the joint extraction of entity and relation is motivated by the relatedness between the entity recognition task and the relation classification task.

General Classification Multi-Task Learning +3

Aspect-Level Sentiment Analysis Via Convolution over Dependency Tree

no code implementations IJCNLP 2019 Kai Sun, Richong Zhang, Samuel Mensah, Yongyi Mao, Xudong Liu

We propose a method based on neural networks to identify the sentiment polarity of opinion words expressed on a specific aspect of a sentence.

Representation Learning Sentence +2

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