What is "Typological Diversity" in NLP?

• URL: http://arxiv.org/abs/2402.04222v4
• Date: Wed, 02 Oct 2024 15:27:36 GMT
• Title: What is "Typological Diversity" in NLP?
• Authors: Esther Ploeger, Wessel Poelman, Miryam de Lhoneux, Johannes Bjerva,
• Abstract summary: We introduce metrics to approximate the diversity of language selection along several axes. We show that skewed language selection can lead to overestimated multilingual performance.
• Score: 7.58293347591642
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• Abstract: The NLP research community has devoted increased attention to languages beyond English, resulting in considerable improvements for multilingual NLP. However, these improvements only apply to a small subset of the world's languages. Aiming to extend this, an increasing number of papers aspires to enhance generalizable multilingual performance across languages. To this end, linguistic typology is commonly used to motivate language selection, on the basis that a broad typological sample ought to imply generalization across a broad range of languages. These selections are often described as being 'typologically diverse'. In this work, we systematically investigate NLP research that includes claims regarding 'typological diversity'. We find there are no set definitions or criteria for such claims. We introduce metrics to approximate the diversity of language selection along several axes and find that the results vary considerably across papers. Crucially, we show that skewed language selection can lead to overestimated multilingual performance. We recommend future work to include an operationalization of 'typological diversity' that empirically justifies the diversity of language samples.

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