Bibliography (6):

1. XLNet: Generalized Autoregressive Pretraining for Language Understanding

2. RoBERTa: A Robustly Optimized BERT Pretraining Approach

3. SQuAD: 100,000+ Questions for Machine Comprehension of Text

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

5. Wikipedia Bibliography:

   1. Data augmentation

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

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