Vy\=akarana: A Colorless Green Benchmark for Syntactic Evaluation in Indic Languages

• URL: http://arxiv.org/abs/2103.00854v1
• Date: Mon, 1 Mar 2021 09:07:58 GMT
• Title: Vy\=akarana: A Colorless Green Benchmark for Syntactic Evaluation in Indic Languages
• Authors: Rajaswa Patil, Jasleen Dhillon, Siddhant Mahurkar, Saumitra Kulkarni, Manav Malhotra and Veeky Baths
• Abstract summary: Indic languages have rich morphosyntax, grammatical genders, free linear word-order, and highly inflectional morphology. We introduce Vy=akarana: a benchmark of gender-balanced Colorless Green sentences in Indic languages for syntactic evaluation of multilingual language models. We use the datasets from the evaluation tasks to probe five multilingual language models of varying architectures for syntax in Indic languages.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: While there has been significant progress towards developing NLU datasets and benchmarks for Indic languages, syntactic evaluation has been relatively less explored. Unlike English, Indic languages have rich morphosyntax, grammatical genders, free linear word-order, and highly inflectional morphology. In this paper, we introduce Vy\=akarana: a benchmark of gender-balanced Colorless Green sentences in Indic languages for syntactic evaluation of multilingual language models. The benchmark comprises four syntax-related tasks: PoS Tagging, Syntax Tree-depth Prediction, Grammatical Case Marking, and Subject-Verb Agreement. We use the datasets from the evaluation tasks to probe five multilingual language models of varying architectures for syntax in Indic languages. Our results show that the token-level and sentence-level representations from the Indic language models (IndicBERT and MuRIL) do not capture the syntax in Indic languages as efficiently as the other highly multilingual language models. Further, our layer-wise probing experiments reveal that while mBERT, DistilmBERT, and XLM-R localize the syntax in middle layers, the Indic language models do not show such syntactic localization.

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