Update README.md

README.md

@@ -21,3 +21,12 @@ configs:
   - split: train
     path: data/train-*
 ---
+
+
+This dummy dataset is used for testing purpose for `rag` model in `transformers`. It is proudced via the following steps:
+
+```bash
+dataset = datasets.load_dataset("wiki_dpr", with_embeddings=True, with_index=True, index_name="exact", embeddings_name="nq", dummy=True, revision=None)
+dataset["train"].drop_index("embeddings")
+dataset.push_to_hub("hf-internal-testing/wiki_dpr_dummy", token="...")
+```