🚨 🚨 Fix custom code saving (#37716)

* Firstly: Better detection of when we're a custom class

* Trigger tests

* Let's break everything

* make fixup

* fix mistaken line doubling

* Let's try to get rid of it from config classes at least

* Let's try to get rid of it from config classes at least

* Fixup image processor

* no more circular import

* Let's go back to setting `_auto_class` again

* Let's go back to setting `_auto_class` again

* stash commit

* Revert the irrelevant changes until we figure out AutoConfig

* Change tests since we're breaking expectations

* make fixup

* do the same for all custom classes

* Cleanup for feature extractor tests

* Cleanup tokenization tests too

* typo

* Fix tokenizer tests

* make fixup

* fix image processor test

* make fixup

* Remove warning from register_for_auto_class

* Stop adding model info to auto map entirely

* Remove todo

* Remove the other todo

* Let's start slapping _auto_class on models why not

* Let's start slapping _auto_class on models why not

* Make sure the tests know what's up

* Make sure the tests know what's up

* Completely remove add_model_info_to_*

* Start adding _auto_class to models

* Start adding _auto_class to models

* Add a flaky decorator

* Add a flaky decorator and import

* stash commit

* More message cleanup

* make fixup

* fix indent

* Fix trust_remote_code prompts

* make fixup

* correct indentation

* Reincorporate changes into dynamic_module_utils

* Update call to trust_remote_code

* make fixup

* Fix video processors too

* Fix video processors too

* Remove is_flaky additions

* make fixup

tests/models/auto/test_image_processing_auto.py

@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import json
+import os
 import sys
 import tempfile
 import unittest
@@ -190,13 +191,12 @@ class AutoImageProcessorTest(unittest.TestCase):
         with tempfile.TemporaryDirectory() as tmp_dir:
             image_processor.save_pretrained(tmp_dir)
             reloaded_image_processor = AutoImageProcessor.from_pretrained(tmp_dir, trust_remote_code=True)
+            self.assertTrue(os.path.exists(os.path.join(tmp_dir, "image_processor.py")))  # Assert we saved custom code
+            self.assertEqual(
+                reloaded_image_processor.auto_map["AutoImageProcessor"], "image_processor.NewImageProcessor"
+            )
         self.assertEqual(reloaded_image_processor.__class__.__name__, "NewImageProcessor")
 
-        # The image processor file is cached in the snapshot directory. So the module file is not changed after dumping
-        # to a temp dir. Because the revision of the module file is not changed.
-        # Test the dynamic module is loaded only once if the module file is not changed.
-        self.assertIs(image_processor.__class__, reloaded_image_processor.__class__)
-
         # Test the dynamic module is reloaded if we force it.
         reloaded_image_processor = AutoImageProcessor.from_pretrained(
             "hf-internal-testing/test_dynamic_image_processor", trust_remote_code=True, force_download=True