Bibliography (5):

1. https://github.com/facebookresearch/contriever

2. Contrastive Representation Learning: A Framework and Review

3. BEIR: A Heterogenous Benchmark for Zero-shot Evaluation of Information Retrieval Models

4. MS MARCO: A Human Generated MAchine Reading COmprehension Dataset

5. Wikipedia Bibliography:

   1. https://en.wikipedia.org/wiki/Okapi_BM25  :

      https://en.wikipedia.org/wiki/Okapi_BM25