Pre-trained language models have achieved promising performance on general
benchmarks, but underperform when migrated to a specific domain. Recent works
perform pre-training from scratch or continual pre-training on domain corpora.
However, in many specific domains, the limited corpus can hardly support
obtaining precise representations. To address this issue, we propose a novel
Transformer-based language model named VarMAE for domain-adaptive language
understanding. Under the masked autoencoding objective, we design a context
uncertainty learning module to encode the token's context into a smooth latent
distribution. The module can produce diverse and well-formed contextual
representations. Experiments on science- and finance-domain NLU tasks
demonstrate that VarMAE can be efficiently adapted to new domains with limited
resources.

本文提出了一种基于 Transformer 的语言模型 ——VarMAE，通过上下文不确定性学习模块，将限定的语料库转化为平滑的潜在分布，从而为特定领域提供多样性和良好形式的上下文表示，实验证明 VarMAE 在科学和金融领域的 NLU 任务中，可以高效地适应有限资源的新领域。