BERT is a pretrained bidirectional transformer language model that learns contextual representations of text for natural language processing tasks. section 11.5
Its practical role is transfer learning: fine-tune the pretrained model with one additional output layer instead of designing substantial task-specific architectures. section 11.5
BERT supports tasks including:
- Question answering. section 11.5
- Language inference. section 11.5
Task adaptation
Start with pretrained BERT, attach one output layer, and fine-tune the resulting model for question answering or language inference. section 11.5








