Zero-Shot Cross-Lingual Opinion Target Extraction

Soufian Jebbara, Philipp Cimiano


Abstract
Aspect-based sentiment analysis involves the recognition of so called opinion target expressions (OTEs). To automatically extract OTEs, supervised learning algorithms are usually employed which are trained on manually annotated corpora. The creation of these corpora is labor-intensive and sufficiently large datasets are therefore usually only available for a very narrow selection of languages and domains. In this work, we address the lack of available annotated data for specific languages by proposing a zero-shot cross-lingual approach for the extraction of opinion target expressions. We leverage multilingual word embeddings that share a common vector space across various languages and incorporate these into a convolutional neural network architecture for OTE extraction. Our experiments with 5 languages give promising results: We can successfully train a model on annotated data of a source language and perform accurate prediction on a target language without ever using any annotated samples in that target language. Depending on the source and target language pairs, we reach performances in a zero-shot regime of up to 77% of a model trained on target language data. Furthermore, we can increase this performance up to 87% of a baseline model trained on target language data by performing cross-lingual learning from multiple source languages.
Anthology ID:
N19-1257
Volume:
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)
Month:
June
Year:
2019
Address:
Minneapolis, Minnesota
Venue:
NAACL
SIG:
Publisher:
Association for Computational Linguistics
Note:
Pages:
2486–2495
Language:
URL:
https://aclanthology.org/N19-1257
DOI:
10.18653/v1/N19-1257
Bibkey:
Cite (ACL):
Soufian Jebbara and Philipp Cimiano. 2019. Zero-Shot Cross-Lingual Opinion Target Extraction. In 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), pages 2486–2495, Minneapolis, Minnesota. Association for Computational Linguistics.
Cite (Informal):
Zero-Shot Cross-Lingual Opinion Target Extraction (Jebbara & Cimiano, NAACL 2019)
Copy Citation:
PDF:
https://aclanthology.org/N19-1257.pdf
Video:
 https://vimeo.com/359684150