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msmarco-v1-passage.cos-dpr-distil.flat-int8.cached.template
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# Anserini Regressions: MS MARCO Passage Ranking
**Model**: cosDPR-distil with quantized flat indexes (using cached queries)
This page describes regression experiments, integrated into Anserini's regression testing framework, using the cosDPR-distil model on the [MS MARCO passage ranking task](https://github.com/microsoft/MSMARCO-Passage-Ranking), as described in the following paper:
> Xueguang Ma, Tommaso Teofili, and Jimmy Lin. [Anserini Gets Dense Retrieval: Integration of Lucene's HNSW Indexes.](https://dl.acm.org/doi/10.1145/3583780.3615112) _Proceedings of the 32nd International Conference on Information and Knowledge Management (CIKM 2023)_, October 2023, pages 5366–5370, Birmingham, the United Kingdom.
In these experiments, we are using cached queries (i.e., cached results of query encoding).
The exact configurations for these regressions are stored in [this YAML file](${yaml}).
Note that this page is automatically generated from [this template](${template}) as part of Anserini's regression pipeline, so do not modify this page directly; modify the template instead and then run `bin/build.sh` to rebuild the documentation.
From one of our Waterloo servers (e.g., `orca`), the following command will perform the complete regression, end to end:
```bash
python src/main/python/run_regression.py --index --verify --search --regression ${test_name}
```
We make available a version of the MS MARCO Passage Corpus that has already been encoded with cosDPR-distil.
From any machine, the following command will download the corpus and perform the complete regression, end to end:
```bash
python src/main/python/run_regression.py --download --index --verify --search --regression ${test_name}
```
The `run_regression.py` script automates the following steps, but if you want to perform each step manually, simply copy/paste from the commands below and you'll obtain the same regression results.
## Corpus Download
Download the corpus and unpack into `collections/`:
```bash
wget ${download_url} -P collections/
tar xvf collections/${corpus}.tar -C collections/
```
To confirm, `${corpus}.tar` is 57 GB and has MD5 checksum `${download_checksum}`.
With the corpus downloaded, the following command will perform the remaining steps below:
```bash
python src/main/python/run_regression.py --index --verify --search --regression ${test_name} \
--corpus-path collections/${corpus}
```
## Indexing
Sample indexing command, building quantized flat indexes:
```bash
${index_cmds}
```
The path `/path/to/${corpus}/` should point to the corpus downloaded above.
Upon completion, we should have an index with 8,841,823 documents.
## Retrieval
Topics and qrels are stored [here](https://github.com/castorini/anserini-tools/tree/master/topics-and-qrels), which is linked to the Anserini repo as a submodule.
The regression experiments here evaluate on the 6980 dev set questions; see [this page](${root_path}/docs/experiments-msmarco-passage.md) for more details.
After indexing has completed, you should be able to perform retrieval as follows using HNSW indexes:
```bash
${ranking_cmds}
```
Evaluation can be performed using `trec_eval`:
```bash
${eval_cmds}
```
## Effectiveness
With the above commands, you should be able to reproduce the following results:
${effectiveness}
The above figures are from running brute-force search with cached queries on non-quantized indexes.
With cached queries on quantized indexes, results may differ slightly.