Create dataset_infos.json

dataset_infos.json

@@ -0,0 +1,15 @@
+{
+  "countdown-backtracking": {
+    "splits": {
+      "train": {
+        "file_name": "train_backtrack.json"
+      },
+      "val_new": {
+        "file_name": "val_new_backtrack.json"
+      },
+      "val_seen": {
+        "file_name": "val_backtrack.json"
+      }
+    }
+  }
+}