feat: "global" endpoint supports "grpc" transport

PiperOrigin-RevId: 878650722

Author: yinghsienwu

google/cloud/aiplatform/initializer.py

@@ -245,10 +245,6 @@ def init(
             # Set api_transport as "rest" if location is "global".
             if location == "global" and not api_transport:
                 self._api_transport = "rest"
-            elif location == "global" and api_transport == "grpc":
-                raise ValueError(
-                    "api_transport cannot be 'grpc' when location is 'global'."
-                )
         if experiment_description and experiment is None:
             raise ValueError(
                 "Experiment needs to be set in `init` in order to add experiment"

tests/unit/aiplatform/test_initializer.py

@@ -306,10 +306,16 @@ def test_create_client_with_global_location(self):
         assert client._transport._host == f"https://{constants.API_BASE_PATH}"
 
     def test_create_client_with_global_location_and_grpc_transport(self):
-        with pytest.raises(ValueError):
-            initializer.global_config.init(
-                project=_TEST_PROJECT, location="global", api_transport="grpc"
-            )
+        initializer.global_config.init(
+            project=_TEST_PROJECT, location="global", api_transport="grpc"
+        )
+        client = initializer.global_config.create_client(
+            client_class=utils.PredictionClientWithOverride
+        )
+        assert initializer.global_config.location == "global"
+        assert initializer.global_config._api_transport == "grpc"
+        assert isinstance(client, utils.PredictionClientWithOverride)
+        assert client._transport._host == f"{constants.API_BASE_PATH}:443"
 
     def test_create_client_with_api_key_and_grpc_transport(self):
         with pytest.raises(ValueError):