Convolution over Hierarchical Syntactic and Lexical Graphs for Aspect Level Sentiment Analysis

Mi Zhang, Tieyun Qian


Abstract
The state-of-the-art methods in aspect-level sentiment classification have leveraged the graph based models to incorporate the syntactic structure of a sentence. While being effective, these methods ignore the corpus level word co-occurrence information, which reflect the collocations in linguistics like “nothing special”. Moreover, they do not distinguish the different types of syntactic dependency, e.g., a nominal subject relation “food-was” is treated equally as an adjectival complement relation “was-okay” in “food was okay”. To tackle the above two limitations, we propose a novel architecture which convolutes over hierarchical syntactic and lexical graphs. Specifically, we employ a global lexical graph to encode the corpus level word co-occurrence information. Moreover, we build a concept hierarchy on both the syntactic and lexical graphs for differentiating various types of dependency relations or lexical word pairs. Finally, we design a bi-level interactive graph convolution network to fully exploit these two graphs. Extensive experiments on five bench- mark datasets show that our method outperforms the state-of-the-art baselines.
Anthology ID:
2020.emnlp-main.286
Volume:
Proceedings of the 2020 Conference on Empirical Methods in Natural Language Processing (EMNLP)
Month:
November
Year:
2020
Address:
Online
Venue:
EMNLP
SIG:
Publisher:
Association for Computational Linguistics
Note:
Pages:
3540–3549
Language:
URL:
https://aclanthology.org/2020.emnlp-main.286
DOI:
10.18653/v1/2020.emnlp-main.286
Bibkey:
Cite (ACL):
Mi Zhang and Tieyun Qian. 2020. Convolution over Hierarchical Syntactic and Lexical Graphs for Aspect Level Sentiment Analysis. In Proceedings of the 2020 Conference on Empirical Methods in Natural Language Processing (EMNLP), pages 3540–3549, Online. Association for Computational Linguistics.
Cite (Informal):
Convolution over Hierarchical Syntactic and Lexical Graphs for Aspect Level Sentiment Analysis (Zhang & Qian, EMNLP 2020)
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