Model versioning (#8324)

* fix typo

* rm use_cdn & references, and implement new hf_bucket_url

* I'm pretty sure we don't need to `read` this file

* same here

* [BIG] file_utils.networking: do not gobble up errors anymore

* Fix CI 😇

* Apply suggestions from code review

Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>

* Tiny doc tweak

* Add doc + pass kwarg everywhere

* Add more tests and explain

cc @sshleifer let me know if better

Co-Authored-By: Sam Shleifer <sshleifer@gmail.com>

* Also implement revision in pipelines

In the case where we're passing a task name or a string model identifier

* Fix CI 😇

* Fix CI

* [hf_api] new methods + command line implem

* make style

* Final endpoints post-migration

* Fix post-migration

* Py3.6 compat

cc @stefan-it

Thank you @stas00

Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>
Co-authored-by: Sam Shleifer <sshleifer@gmail.com>

src/transformers/modelcard.py

@@ -144,9 +144,7 @@ class ModelCard:
         elif os.path.isfile(pretrained_model_name_or_path) or is_remote_url(pretrained_model_name_or_path):
             model_card_file = pretrained_model_name_or_path
         else:
-            model_card_file = hf_bucket_url(
-                pretrained_model_name_or_path, filename=MODEL_CARD_NAME, use_cdn=False, mirror=None
-            )
+            model_card_file = hf_bucket_url(pretrained_model_name_or_path, filename=MODEL_CARD_NAME, mirror=None)
 
         if find_from_standard_name or pretrained_model_name_or_path in ALL_PRETRAINED_CONFIG_ARCHIVE_MAP:
             model_card_file = model_card_file.replace(CONFIG_NAME, MODEL_CARD_NAME)
@@ -156,8 +154,6 @@ class ModelCard:
         try:
             # Load from URL or cache if already cached
             resolved_model_card_file = cached_path(model_card_file, cache_dir=cache_dir, proxies=proxies)
-            if resolved_model_card_file is None:
-                raise EnvironmentError
             if resolved_model_card_file == model_card_file:
                 logger.info("loading model card file {}".format(model_card_file))
             else: