Update README.md

README.md

@@ -28,4 +28,23 @@ configs:
     path: data/validation-*
   - split: test
     path: data/test-*
+language:
+- en
 ---
+
+
+This dataset includes all arxiv documents from the 00.jsonl.zst partition of The Pile. It was created with this script:
+
+```
+pile_path = "data/the_pile/train/00.jsonl.zst"
+
+with zstd.open(pile_path, 'r') as fr:
+    with open("/tmp/arxiv.jsonl", "w") as fw:
+        for i, line in enumerate(tqdm(fr)):
+            doc = json.loads(line)
+            source = doc['meta']['pile_set_name']
+            if source == "ArXiv":
+                fw.write(json.dumps(doc) + "\n")
+```
+
+The validation and test sets are the full official releases.