Towards Zero-shot Language Modeling

• URL: http://arxiv.org/abs/2108.03334v1
• Date: Fri, 6 Aug 2021 23:49:18 GMT
• Title: Towards Zero-shot Language Modeling
• Authors: Edoardo Maria Ponti, Ivan Vuli\'c, Ryan Cotterell, Roi Reichart, and Anna Korhonen
• Abstract summary: We construct a neural model that is inductively biased towards learning human languages. We infer this distribution from a sample of typologically diverse training languages. We harness additional language-specific side information as distant supervision for held-out languages.
• Score: 90.80124496312274
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Can we construct a neural model that is inductively biased towards learning human languages? Motivated by this question, we aim at constructing an informative prior over neural weights, in order to adapt quickly to held-out languages in the task of character-level language modeling. We infer this distribution from a sample of typologically diverse training languages via Laplace approximation. The use of such a prior outperforms baseline models with an uninformative prior (so-called "fine-tuning") in both zero-shot and few-shot settings. This shows that the prior is imbued with universal phonological knowledge. Moreover, we harness additional language-specific side information as distant supervision for held-out languages. Specifically, we condition language models on features from typological databases, by concatenating them to hidden states or generating weights with hyper-networks. These features appear beneficial in the few-shot setting, but not in the zero-shot setting. Since the paucity of digital texts affects the majority of the world's languages, we hope that these findings will help broaden the scope of applications for language technology.

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