CSSL: Contrastive Self-Supervised Learning for Dependency Parsing on Relatively Free Word Ordered and Morphologically Rich Low Resource Languages
Abstract: Neural dependency parsing has achieved remarkable performance for low resource morphologically rich languages. It has also been well-studied that morphologically rich languages exhibit relatively free word order. This prompts a fundamental investigation: *Is there a way to enhance dependency parsing performance, making the model robust to word order variations utilizing the relatively free word order nature of morphologically rich languages?* In this work, we examine the robustness of graph-based parsing architectures on 7 relatively free word order languages. We focus on scrutinizing essential modifications such as data augmentation and the removal of position encoding required to adapt these architectures accordingly. To this end, we propose a contrastive self-supervised learning method to make the model robust to word order variations. Furthermore, our proposed modification demonstrates a substantial average gain of 3.03/2.95 points in 7 relatively free word order languages, as measured by the UAS/LAS Score metric when compared to the best performing baseline.
Paper Type: Short
Research Area: Syntax: Tagging, Chunking and Parsing
Research Area Keywords: dependency parsing, morphologically-rich languages, contrastive learning, low resource languages.
Contribution Types: NLP engineering experiment, Approaches to low-resource settings
Languages Studied: Sanskrit, Turkish, Telugu, Gothic, Hungarian, Ancient Hebrew, Lithuanian
Submission Number: 4545
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