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Zero-shot Cross-lingual Transfer With Learned Projections Using Unlabeled Target-Language Data

Ujan Deb, Ridayesh Parab, Preethi Jyothi


Abstract
Adapters have emerged as a parameter-efficient Transformer-based framework for cross-lingual transfer by inserting lightweight language-specific modules (language adapters) and task-specific modules (task adapters) within pretrained multilingual models. Zero-shot transfer is enabled by pairing the language adapter in the target language with an appropriate task adapter in a source language. If our target languages are known apriori, we explore how zero-shot transfer can be further improved within the adapter framework by utilizing unlabeled text during task-specific finetuning. We construct language-specific subspaces using standard linear algebra constructs and selectively project source-language representations into the target language subspace during task-specific finetuning using two schemes. Our experiments on three cross-lingual tasks, Named Entity Recognition (NER), Question Answering (QA) and Natural Language Inference (NLI) yield consistent benefits compared to adapter baselines over a wide variety of target languages with up to 11% relative improvement in NER, 2% relative improvement in QA and 5% relative improvement in NLI.
Anthology ID:
2023.acl-short.39
Volume:
Proceedings of the 61st Annual Meeting of the Association for Computational Linguistics (Volume 2: Short Papers)
Month:
July
Year:
2023
Address:
Toronto, Canada
Editors:
Anna Rogers, Jordan Boyd-Graber, Naoaki Okazaki
Venue:
ACL
SIG:
Publisher:
Association for Computational Linguistics
Note:
Pages:
449–457
Language:
URL:
https://aclanthology.org/2023.acl-short.39
DOI:
10.18653/v1/2023.acl-short.39
Bibkey:
Cite (ACL):
Ujan Deb, Ridayesh Parab, and Preethi Jyothi. 2023. Zero-shot Cross-lingual Transfer With Learned Projections Using Unlabeled Target-Language Data. In Proceedings of the 61st Annual Meeting of the Association for Computational Linguistics (Volume 2: Short Papers), pages 449–457, Toronto, Canada. Association for Computational Linguistics.
Cite (Informal):
Zero-shot Cross-lingual Transfer With Learned Projections Using Unlabeled Target-Language Data (Deb et al., ACL 2023)
Copy Citation:
PDF:
https://aclanthology.org/2023.acl-short.39.pdf
Video:
 https://aclanthology.org/2023.acl-short.39.mp4