readme: fact verification model(FVM) is trained on [FEVER](https://fever.ai), which aims to predict the veracity of a textual claim against a trustworthy knowledge source such as Wikipedia. 
  
  This repo hosts the following models for `FVM`:
  - `fact_checking/`: the verification models based on BERT (large) and RoBERTa (large), respectively.
  - `mrc_seq2seq/`: the generative machine reading comprehension model based on BART (base).
  - `evidence_retrieval/`: the evidence sentence ranking models, which are copied directly from [KGAT](https://github.com/thunlp/KernelGAT).