Fix python version issues with typing

oe_dataset.py

@@ -16,8 +16,14 @@
  #
 """OE dataset"""
 
-from collections.abc import Sequence
-from typing import Optional, Generator, Tuple, IO
+import sys
+if sys.version_info < (3, 9):
+    from typing import Sequence, Generator, Tuple
+else:
+    from collections.abc import Sequence, Generator
+    Tuple = tuple
+
+from typing import Optional, IO
 
 import datasets