msmarco-passage-doc2query.template

# Anserini: Regressions for [MS MARCO Passage Retrieval](https://github.com/microsoft/MSMARCO-Passage-Ranking)

This page documents regression experiments for the MS MARCO Passage Retrieval Task with doc2query expansions, as proposed in the following paper:

+ Rodrigo Nogueira, Wei Yang, Jimmy Lin, Kyunghyun Cho. [Document Expansion by Query Prediction.](https://arxiv.org/abs/1904.08375) _arxiv:1904.08375_

These experiments are integrated into Anserini's regression testing framework.
For more complete instructions on how to run end-to-end experiments, refer to [this page](experiments-doc2query.md).

The exact configurations for these regressions are stored in [this YAML file](../src/main/resources/regression/msmarco-passage-doc2query.yaml).
Note that this page is automatically generated from [this template](../src/main/resources/docgen/templates/msmarco-passage-doc2query.template) as part of Anserini's regression pipeline, so do not modify this page directly; modify the template instead.

## Indexing

Typical indexing command:

```
${index_cmds}
```

The directory `/path/to/msmarco-passage/` should be a directory containing `jsonl` files converted from the official passage collection, appended with the doc2query expansions.

For additional details, see explanation of [common indexing options](common-indexing-options.md).

## Retrieval

Topics and qrels are stored in [`src/main/resources/topics-and-qrels/`](../src/main/resources/topics-and-qrels/).
The regression experiments here evaluate on the 6980 dev set questions; see [this page](experiments-msmarco-passage.md) for more details.

After indexing has completed, you should be able to perform retrieval as follows:

```
${ranking_cmds}
```

Evaluation can be performed using `trec_eval`:

```
${eval_cmds}
```

## Effectiveness

With the above commands, you should be able to replicate the following results:

${effectiveness}

The setting "default" refers the default BM25 settings of `k1=0.9`, `b=0.4`, while "tuned" refers to the tuned setting of `k1=0.82`, `b=0.72` _on the original passages_.
See [this page](experiments-msmarco-passage.md) for more details.
Note that these results are slightly different from the above referenced page because those experiments make up "fake" scores when converting runs from MS MARCO format into TREC format for evaluation by `trec_eval`.