feat: GenAI Client(evals): Add allow_cross_region_model to generate_conversation_scenarios to enable cross region support for gemini 3 based model

tests/unit/vertexai/genai/test_evals.py

@@ -3674,12 +3674,16 @@ def test_run_inference_with_litellm_openai_request_format(
         mock_api_client_fixture,
     ):
         """Tests inference with LiteLLM where the row contains a chat completion request body."""
+        # fmt: off
         with (
-            mock.patch("vertexai._genai._evals_common.litellm") as mock_litellm,
+            mock.patch(
+                "vertexai._genai._evals_common.litellm"
+            ) as mock_litellm,
             mock.patch(
                 "vertexai._genai._evals_common._call_litellm_completion"
             ) as mock_call_litellm_completion,
         ):
+            # fmt: on
             mock_litellm.get_llm_provider.return_value = (
                 "gpt-4o",
                 "openai",
@@ -8452,6 +8456,7 @@ def test_generate_conversation_scenarios(self):
                 root_agent_id="agent_1",
             ),
             config={"count": 2},
+            allow_cross_region_model=True,
         )
         assert isinstance(eval_dataset, vertexai_genai_types.EvaluationDataset)
         assert len(eval_dataset.eval_cases) == 2
@@ -8468,6 +8473,9 @@ def test_generate_conversation_scenarios(self):
         assert eval_dataset.eval_dataset_df.iloc[1]["conversation_plan"] == "Plan 2"
 
         self.mock_api_client.request.assert_called_once()
+        call_args = self.mock_api_client.request.call_args
+        request_body = call_args[0][2]  # Third positional arg is the request dict
+        assert request_body.get("allowCrossRegionModel") is True
 
     @pytest.mark.asyncio
     async def test_async_generate_conversation_scenarios(self):
@@ -8484,6 +8492,7 @@ async def test_async_generate_conversation_scenarios(self):
                 root_agent_id="agent_1",
             ),
             config={"count": 2},
+            allow_cross_region_model=True,
         )
         assert isinstance(eval_dataset, vertexai_genai_types.EvaluationDataset)
         assert len(eval_dataset.eval_cases) == 2
@@ -8497,6 +8506,9 @@ async def test_async_generate_conversation_scenarios(self):
         assert eval_dataset.eval_dataset_df.iloc[1]["conversation_plan"] == "Plan 2"
 
         self.mock_api_client.async_request.assert_called_once()
+        call_args = self.mock_api_client.async_request.call_args
+        request_body = call_args[0][2]  # Third positional arg is the request dict
+        assert request_body.get("allowCrossRegionModel") is True
 
 
 class TestTransformDataframe:

vertexai/_genai/evals.py

@@ -683,6 +683,13 @@ def _GenerateUserScenariosParameters_to_vertex(
     if getv(from_object, ["config"]) is not None:
         setv(to_object, ["config"], getv(from_object, ["config"]))
 
+    if getv(from_object, ["allow_cross_region_model"]) is not None:
+        setv(
+            to_object,
+            ["allowCrossRegionModel"],
+            getv(from_object, ["allow_cross_region_model"]),
+        )
+
     return to_object
 
 
@@ -1473,6 +1480,7 @@ def _generate_user_scenarios(
             evals_types.UserScenarioGenerationConfigOrDict
         ] = None,
         config: Optional[types.GenerateUserScenariosConfigOrDict] = None,
+        allow_cross_region_model: Optional[bool] = None,
     ) -> types.GenerateUserScenariosResponse:
         """
         Generates user scenarios for agent evaluation.
@@ -1484,6 +1492,7 @@ def _generate_user_scenarios(
             root_agent_id=root_agent_id,
             user_scenario_generation_config=user_scenario_generation_config,
             config=config,
+            allow_cross_region_model=allow_cross_region_model,
         )
 
         request_url_dict: Optional[dict[str, str]]
@@ -2852,6 +2861,7 @@ def generate_conversation_scenarios(
         *,
         agent_info: evals_types.AgentInfoOrDict,
         config: evals_types.UserScenarioGenerationConfigOrDict,
+        allow_cross_region_model: Optional[bool] = None,
     ) -> types.EvaluationDataset:
         """Generates an evaluation dataset with user scenarios,
            which helps to generate conversations between a simulated user
@@ -2860,6 +2870,8 @@ def generate_conversation_scenarios(
         Args:
             agent_info: The agent info to generate user scenarios for.
             config: Configuration for generating user scenarios.
+            allow_cross_region_model: Opt-in flag to authorize cross-region
+                routing for model inference.
 
         Returns:
             An EvaluationDataset containing the generated user scenarios.
@@ -2873,6 +2885,7 @@ def generate_conversation_scenarios(
             agents=parsed_agent_info.agents,
             root_agent_id=parsed_agent_info.root_agent_id,
             user_scenario_generation_config=config,
+            allow_cross_region_model=allow_cross_region_model,
         )
         return _evals_utils._postprocess_user_scenarios_response(response)
 
@@ -3592,6 +3605,7 @@ async def _generate_user_scenarios(
             evals_types.UserScenarioGenerationConfigOrDict
         ] = None,
         config: Optional[types.GenerateUserScenariosConfigOrDict] = None,
+        allow_cross_region_model: Optional[bool] = None,
     ) -> types.GenerateUserScenariosResponse:
         """
         Generates user scenarios for agent evaluation.
@@ -3603,6 +3617,7 @@ async def _generate_user_scenarios(
             root_agent_id=root_agent_id,
             user_scenario_generation_config=user_scenario_generation_config,
             config=config,
+            allow_cross_region_model=allow_cross_region_model,
         )
 
         request_url_dict: Optional[dict[str, str]]
@@ -4622,6 +4637,7 @@ async def generate_conversation_scenarios(
         *,
         agent_info: evals_types.AgentInfoOrDict,
         config: evals_types.UserScenarioGenerationConfigOrDict,
+        allow_cross_region_model: Optional[bool] = None,
     ) -> types.EvaluationDataset:
         """Generates an evaluation dataset with user scenarios,
            which helps to generate conversations between a simulated user
@@ -4630,6 +4646,8 @@ async def generate_conversation_scenarios(
         Args:
             agent_info: The agent info to generate user scenarios for.
             config: Configuration for generating user scenarios.
+            allow_cross_region_model: Opt-in flag to authorize cross-region
+                routing for model inference.
 
         Returns:
             An EvaluationDataset containing the generated user scenarios.
@@ -4643,6 +4661,7 @@ async def generate_conversation_scenarios(
             agents=parsed_agent_info.agents,
             root_agent_id=parsed_agent_info.root_agent_id,
             user_scenario_generation_config=config,
+            allow_cross_region_model=allow_cross_region_model,
         )
         return _evals_utils._postprocess_user_scenarios_response(response)
 

vertexai/_genai/types/common.py

@@ -5012,6 +5012,10 @@ class _GenerateUserScenariosParameters(_common.BaseModel):
     config: Optional[GenerateUserScenariosConfig] = Field(
         default=None, description=""""""
     )
+    allow_cross_region_model: Optional[bool] = Field(
+        default=None,
+        description="""Opt-in flag to authorize cross-region routing for LLM models.""",
+    )
 
 
 class _GenerateUserScenariosParametersDict(TypedDict, total=False):
@@ -5032,6 +5036,9 @@ class _GenerateUserScenariosParametersDict(TypedDict, total=False):
     config: Optional[GenerateUserScenariosConfigDict]
     """"""
 
+    allow_cross_region_model: Optional[bool]
+    """Opt-in flag to authorize cross-region routing for LLM models."""
+
 
 _GenerateUserScenariosParametersOrDict = Union[
     _GenerateUserScenariosParameters, _GenerateUserScenariosParametersDict