Bibliography (9):

1. Attention Is All You Need

2. BERT: Pre-training of Deep Bidirectional Transformers for Language Understanding

3. GLUE: A Multi-Task Benchmark and Analysis Platform for Natural Language Understanding

4. Know What You Don’t Know: Unanswerable Questions for SQuAD

5. https://github.com/microsoft/unilm

6. Wikipedia Bibliography:

   1. Convolutional neural network

   2. ROUGE (metric)

   3. https://en.wikipedia.org/wiki/F-score  :

      https://en.wikipedia.org/wiki/F-score

   4. BLEU