cochrane_dense_oracle

This is a copy of the [Cochrane](https://huggingface.co/datasets/allenai/mslr2022) dataset, except the input source documents of the `train`, `validation`, and `test` splits have been replaced by a __dense__ retriever.

- __query__: The `target` field of each example
- __corpus__: The union of all documents in the `train`, `validation` and `test` splits. A document is the concatenation of the `title` and `abstract`.
- __retriever__: [`facebook/contriever-msmarco`](https://huggingface.co/facebook/contriever-msmarco) via [PyTerrier](https://pyterrier.readthedocs.io/en/latest/) with default settings
- __top-k strategy__: `"oracle"`, i.e. the number of documents retrieved, `k`, is set as the original number of input documents for each example

Retrieval results on the `train` set:

| Recall@100 | Rprec | Precision@k | Recall@k |
| ----------- | ----------- | ----------- | ----------- |
| 0.7790 | 0.4487 | 0.4487 | 0.4487 |

Retrieval results on the `validation` set:

| Recall@100 | Rprec | Precision@k | Recall@k |
| ----------- | ----------- | ----------- | ----------- |
| 0.7856 | 0.4424 | 0.4424 | 0.4424 |

Retrieval results on the `test` set:

N/A. Test set is blind so we do not have any queries.

本数据集为[Cochrane](https://huggingface.co/datasets/allenai/mslr2022)数据集的副本，仅将其`train`（训练集划分）、`validation`（验证集划分）与`test`（测试集划分）的输入源文档替换为**稠密检索器（dense retriever）**。

- **查询（query）**：对应每个示例的`target`字段
- **语料库（corpus）**：为`train`、`validation`和`test`划分中所有文档的并集，单篇文档由`title`（标题）与`abstract`（摘要）拼接而成。
- **检索器（retriever）**：采用[`facebook/contriever-msmarco`](https://huggingface.co/facebook/contriever-msmarco)，通过[PyTerrier](https://pyterrier.readthedocs.io/en/latest/)以默认配置运行。
- **Top-K检索策略（top-k strategy）**：采用"oracle"（神谕）策略，即检索返回的文档数`k`被设置为每个示例原始的输入文档数量。

训练集检索结果：
| 召回率@100（Recall@100） | R值精确率（Rprec） | 精确率@k（Precision@k） | 召回率@k（Recall@k） |
| ----------- | ----------- | ----------- | ----------- |
| 0.7790 | 0.4487 | 0.4487 | 0.4487 |

验证集检索结果：
| 召回率@100（Recall@100） | R值精确率（Rprec） | 精确率@k（Precision@k） | 召回率@k（Recall@k） |
| ----------- | ----------- | ----------- | ----------- |
| 0.7856 | 0.4424 | 0.4424 | 0.4424 |

测试集检索结果：
N/A。测试集为盲测集，因此无可用查询数据。