Update README

README.md

@@ -1,15 +1,15 @@
 ---
 configs:
-- config_name: split_1
-  data_files: crag_task_1_and_2_dev_v4_split_cdf90925.jsonl.bz2
-- config_name: split_2
-  data_files: crag_task_1_and_2_dev_v4_split_2e617280.jsonl.bz2
-- config_name: split_3
-  data_files: crag_task_1_and_2_dev_v4_split_9bca9871.jsonl.bz2
-- config_name: split_4
-  data_files: crag_task_1_and_2_dev_v4_split_ff5aa423.jsonl.bz2
-- config_name: split_5
-  data_files: crag_task_1_and_2_dev_v4_split_3f4353ba.jsonl.bz2
+- config_name: crag_task_1_and_2_subsample_1
+  data_files: crag_task_1_and_2_dev_v4_subsample_cdf90925.jsonl.bz2
+- config_name: crag_task_1_and_2_subsample_2
+  data_files: crag_task_1_and_2_dev_v4_subsample_2e617280.jsonl.bz2
+- config_name: crag_task_1_and_2_subsample_3
+  data_files: crag_task_1_and_2_dev_v4_subsample_9bca9871.jsonl.bz2
+- config_name: crag_task_1_and_2_subsample_4
+  data_files: crag_task_1_and_2_dev_v4_subsample_ff5aa423.jsonl.bz2
+- config_name: crag_task_1_and_2_subsample_5
+  data_files: crag_task_1_and_2_dev_v4_subsample_3f4353ba.jsonl.bz2
 license: cc-by-nc-4.0
 task_categories:
 - question-answering
@@ -24,4 +24,12 @@ size_categories:
 pretty_name: CRA
 ---
 
-Datasets are taken from Facebook's [CRAG: Comprehensive RAG Benchmark](https://github.com/facebookresearch/CRAG), see their [arXiv paper](https://arxiv.org/abs/2406.04744) for details about the dataset construction.
+Datasets are taken from Facebook's [CRAG: Comprehensive RAG Benchmark](https://github.com/facebookresearch/CRAG), see their [arXiv paper](https://arxiv.org/abs/2406.04744) for details about the dataset construction.
+
+The datasets `crag_task_1_and_2_dev_v4_subsample_*.json.bz2` have been created from the dataset [crag_task_1_and_2_dev_v4.jsonl.bz2](https://github.com/facebookresearch/CRAG/raw/refs/heads/main/data/crag_task_1_and_2_dev_v4.jsonl.bz2?download=) available on CRAG's GitHub repository. 
+For an easier handling and download of the dataset, we have split the 2706 rows of the original file in 5 subsamples, following the procedure below: 
+1. We have created a new label `answer_type`, classifying the answers in 3 categories:
+      - `invalid` for any answer == "invalid question"
+      - `no_answer` for any answer == "i don't know"
+      - `valid` for any other answer
+2. We have considered the labels `answer_type`, `domain`, `question_type` and `static_or_dynamic` and performed stratified sampling, splitting the datasets in 5 subsamples. Each subsample has thus the same statistical properties of the full dataset.