# TREC CAsT 2021 Ideas

## Indexing:

## Retrieve:

- Tuning BM25
- [tests on msmarco documents](https://github.com/castorini/anserini/blob/master/docs/experiments-msmarco-doc.md)

[BERT-based Dense Retrieve v1](https://github.com/castorini/pyserini/blob/master/docs/experiments-tct_colbert.md)
- [paper](https://arxiv.org/abs/2010.11386)

[BERT-based Dense Retrieve v2](https://github.com/castorini/pyserini/blob/master/docs/experiments-tct_colbert-v2.md)
- [paper](https://cs.uwaterloo.ca/~jimmylin/publications/Lin_etal_2021_RepL4NLP.pdf)
- [] [COIL for expansion?](https://arxiv.org/pdf/2106.14807.pdf)

## Rerank
- [x] t5 rerank
- [ ] [TREC 2020 Deep Learning overview](https://arxiv.org/pdf/2102.07662.pdf)

## Coreference
- [x] Canard

## Query Exapnsion
- [x] Rm3
- [x] HQE

## Document Expansion
- doc2t5 query

## expando-duo-mono:

- Retrieve:
- 2. BM25/(dense retrieve) - 1
- Rerank:
- 3. mono-t5
- 4. duo-t5