This cl:
1- Changes the retriever.py to always return retrieved results, rather than None in case of pyserini retriver.
2- reranker class does not need the dataset name, I added it as an arg to the write function.
3- Updated requirments.txt to flexible versions, rankzephyr needs more recent transformers version
This cl: 1- Changes the retriever.py to always return retrieved results, rather than None in case of pyserini retriver. 2- reranker class does not need the dataset name, I added it as an arg to the write function. 3- Updated requirments.txt to flexible versions, rankzephyr needs more recent transformers version