Update README.md

README.md

@@ -69,9 +69,13 @@ dataset_info:
     - name: index
       dtype: int32
     - name: input_grid
-      dtype: sequence
+      sequence:
+        sequence:
+          dtype: string
     - name: ground_truth
-      dtype: sequence
+      sequence:
+        sequence:
+          dtype: string
 tags:
   - reasoning
   - physical reasoning