Bi-Granularity Contrastive Learning for Post-Training in Few-Shot Scene

• URL: http://arxiv.org/abs/2106.02327v1
• Date: Fri, 4 Jun 2021 08:17:48 GMT
• Title: Bi-Granularity Contrastive Learning for Post-Training in Few-Shot Scene
• Authors: Ruikun Luo, Guanhuan Huang, Xiaojun Quan
• Abstract summary: We propose contrastive masked language modeling (CMLM) for post-training to integrate both token-level and sequence-level contrastive learnings. CMLM surpasses several recent post-training methods in few-shot settings without the need for data augmentation.
• Score: 10.822477939237459
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The major paradigm of applying a pre-trained language model to downstream tasks is to fine-tune it on labeled task data, which often suffers instability and low performance when the labeled examples are scarce.~One way to alleviate this problem is to apply post-training on unlabeled task data before fine-tuning, adapting the pre-trained model to target domains by contrastive learning that considers either token-level or sequence-level similarity. Inspired by the success of sequence masking, we argue that both token-level and sequence-level similarities can be captured with a pair of masked sequences.~Therefore, we propose complementary random masking (CRM) to generate a pair of masked sequences from an input sequence for sequence-level contrastive learning and then develop contrastive masked language modeling (CMLM) for post-training to integrate both token-level and sequence-level contrastive learnings.~Empirical results show that CMLM surpasses several recent post-training methods in few-shot settings without the need for data augmentation.

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