1. BERT: Pre-training of deep bidirectional transformers for language understanding;Devlin,2019
2. Exploring the limits of transfer learning with a unified text-to-text transformer;Raffel;J. Mach. Learn. Res.,2020
3. RoBERTa: A robustly optimized BERT pretraining approach;Liu,2019
4. ALBERT: A lite BERT for self-supervised learning of language representations;Lan,2020
5. What does BERT look at? An analysis of BERT’s attention;Clark,2019