Allow remote code repo names to contain "." (#29175)

* stash commit

* stash commit

* It works!

* Remove unnecessary change

* We don't actually need the cache_dir!

* Update docstring

* Add test

* Add test with custom cache dir too

* Update model repo path

tests/models/auto/test_modeling_auto.py

@@ -376,6 +376,27 @@ class AutoModelTest(unittest.TestCase):
         for p1, p2 in zip(model.parameters(), reloaded_model.parameters()):
             self.assertTrue(torch.equal(p1, p2))
 
+    def test_from_pretrained_dynamic_model_with_period(self):
+        # We used to have issues where repos with "." in the name would cause issues because the Python
+        # import machinery would treat that as a directory separator, so we test that case
+
+        # If remote code is not set, we will time out when asking whether to load the model.
+        with self.assertRaises(ValueError):
+            model = AutoModel.from_pretrained("hf-internal-testing/test_dynamic_model_v1.0")
+        # If remote code is disabled, we can't load this config.
+        with self.assertRaises(ValueError):
+            model = AutoModel.from_pretrained("hf-internal-testing/test_dynamic_model_v1.0", trust_remote_code=False)
+
+        model = AutoModel.from_pretrained("hf-internal-testing/test_dynamic_model_v1.0", trust_remote_code=True)
+        self.assertEqual(model.__class__.__name__, "NewModel")
+
+        # Test that it works with a custom cache dir too
+        with tempfile.TemporaryDirectory() as tmp_dir:
+            model = AutoModel.from_pretrained(
+                "hf-internal-testing/test_dynamic_model_v1.0", trust_remote_code=True, cache_dir=tmp_dir
+            )
+            self.assertEqual(model.__class__.__name__, "NewModel")
+
     def test_new_model_registration(self):
         AutoConfig.register("custom", CustomConfig)