Before revision: Bidirectional Encoder Representations from Transformers (BERT) has shown marvelous improvements across various NLP tasks, and various variants have been proposed to further improve the performance of the pre-trained  models.
After revision: Bidirectional Encoder Representations from Transformers (BERT) has shown marvelous improvements across various NLP tasks, and consecutive variants have been proposed to further improve the performance of the pre-trained models.