Allow models to be registered as long as llama model is provided

llama_stack/providers/tests/inference/test_model_registration.py

@@ -8,6 +8,7 @@ import pytest
 
 from llama_models.datatypes import CoreModelId
 
+
 # How to run this test:
 #
 # pytest -v -s llama_stack/providers/tests/inference/test_model_registration.py
@@ -17,8 +18,17 @@ from llama_models.datatypes import CoreModelId
 
 class TestModelRegistration:
     @pytest.mark.asyncio
-    async def test_register_unsupported_model(self, inference_stack):
-        _, models_impl = inference_stack
+    async def test_register_unsupported_model(self, inference_stack, inference_model):
+        inference_impl, models_impl = inference_stack
+
+        provider = inference_impl.routing_table.get_provider_impl(inference_model)
+        if provider.__provider_spec__.provider_type not in (
+            "meta-reference",
+            "remote::ollama",
+            "remote::vllm",
+            "remote::tgi",
+        ):
+            pytest.skip("70B instruct is too big only for local inference providers")
 
         # Try to register a model that's too large for local inference
         with pytest.raises(Exception) as exc_info:
@@ -37,21 +47,10 @@ class TestModelRegistration:
             )
 
     @pytest.mark.asyncio
-    async def test_update_model(self, inference_stack):
+    async def test_register_with_llama_model(self, inference_stack):
         _, models_impl = inference_stack
 
-        # Register a model to update
-        model_id = CoreModelId.llama3_1_8b_instruct.value
-        old_model = await models_impl.register_model(model_id=model_id)
-
-        # Update the model
-        new_model_id = CoreModelId.llama3_2_3b_instruct.value
-        updated_model = await models_impl.update_model(
-            model_id=model_id, provider_model_id=new_model_id
+        _ = await models_impl.register_model(
+            model_id="custom-model",
+            metadata={"llama_model": CoreModelId.llama3_1_8b_instruct.value},
         )
-
-        # Retrieve the updated model to verify changes
-        assert updated_model.provider_resource_id != old_model.provider_resource_id
-
-        # Cleanup
-        await models_impl.unregister_model(model_id=model_id)

llama_stack/providers/utils/inference/model_registry.py

@@ -51,7 +51,7 @@ class ModelRegistryHelper(ModelsProtocolPrivate):
         if identifier in self.alias_to_provider_id_map:
             return self.alias_to_provider_id_map[identifier]
         else:
-            raise ValueError(f"Unknown model: `{identifier}`")
+            return None
 
     def get_llama_model(self, provider_model_id: str) -> str:
         if provider_model_id in self.provider_id_to_llama_model_map:
@@ -60,8 +60,18 @@ class ModelRegistryHelper(ModelsProtocolPrivate):
             return None
 
     async def register_model(self, model: Model) -> Model:
-        model.provider_resource_id = self.get_provider_model_id(
-            model.provider_resource_id
-        )
+        provider_resource_id = self.get_provider_model_id(model.provider_resource_id)
+        if provider_resource_id:
+            model.provider_resource_id = provider_resource_id
+        else:
+            if model.metadata.get("llama_model") is None:
+                raise ValueError(
+                    f"Model '{model.provider_resource_id}' is not available and no llama_model was specified in metadata. "
+                    "Please specify a llama_model in metadata or use a supported model identifier"
+                )
+            # Register the mapping from provider model id to llama model for future lookups
+            self.provider_id_to_llama_model_map[model.provider_resource_id] = (
+                model.metadata["llama_model"]
+            )
 
         return model