Fix Counter import (#2580)

src/datasets/arrow_dataset.py

@@ -22,14 +22,14 @@
 import os
 import shutil
 import tempfile
-from collections import defaultdict
+from collections import Counter, defaultdict
 from collections.abc import Iterable, Mapping
 from copy import deepcopy
 from dataclasses import asdict
 from functools import partial, wraps
 from math import ceil, floor
 from pathlib import Path
-from typing import TYPE_CHECKING, Any, BinaryIO, Callable, Counter, Dict, Iterator, List, Optional, Tuple, Union
+from typing import TYPE_CHECKING, Any, BinaryIO, Callable, Dict, Iterator, List, Optional, Tuple, Union
 
 import fsspec
 import numpy as np