Use commit hash to look in cache instead of calling head (#18534)

* Use commit hash to look in cache instead of calling head

* Add tests

* Add attr for local configs too

* Stupid typos

* Fix tests

* Update src/transformers/utils/hub.py

Co-authored-by: Julien Chaumond <julien@huggingface.co>

* Address Julien's comments

Co-authored-by: Julien Chaumond <julien@huggingface.co>

src/transformers/testing_utils.py

@@ -31,6 +31,7 @@ from pathlib import Path
 from typing import Iterator, List, Union
 from unittest import mock
 
+import huggingface_hub
 from transformers import logging as transformers_logging
 
 from .deepspeed import is_deepspeed_available
@@ -1588,3 +1589,30 @@ def run_command(command: List[str], return_stdout=False):
         raise SubprocessCallException(
             f"Command `{' '.join(command)}` failed with the following error:\n\n{e.output.decode()}"
         ) from e
+
+
+class RequestCounter:
+    """
+    Helper class that will count all requests made online.
+    """
+
+    def __enter__(self):
+        self.head_request_count = 0
+        self.get_request_count = 0
+        self.other_request_count = 0
+        self.old_request = huggingface_hub.file_download.requests.request
+        huggingface_hub.file_download.requests.request = self.new_request
+        return self
+
+    def __exit__(self, *args, **kwargs):
+        huggingface_hub.file_download.requests.request = self.old_request
+
+    def new_request(self, method, **kwargs):
+        if method == "GET":
+            self.get_request_count += 1
+        elif method == "HEAD":
+            self.head_request_count += 1
+        else:
+            self.other_request_count += 1
+
+        return self.old_request(method=method, **kwargs)