remove model lookup class

docs/source/getting_started/index.md

@@ -538,7 +538,7 @@ Once the server is set up, we can test it with a client to verify it's working c
 $ curl http://localhost:5000/inference/chat_completion \
 -H "Content-Type: application/json" \
 -d '{
-    "model": "Llama3.1-8B-Instruct",
+    "model_id": "Llama3.1-8B-Instruct",
     "messages": [
         {"role": "system", "content": "You are a helpful assistant."},
         {"role": "user", "content": "Write me a 2 sentence poem about the moon"}

llama_stack/providers/utils/inference/model_registry.py

@@ -15,7 +15,6 @@ ModelAlias = namedtuple("ModelAlias", ["provider_model_id", "aliases", "llama_mo
 
 
 def get_huggingface_repo(model_descriptor: str) -> Optional[str]:
-    """Get the Hugging Face repository for a given CoreModelId."""
     for model in all_registered_models():
         if model.descriptor() == model_descriptor:
             return model.huggingface_repo
@@ -33,11 +32,8 @@ def build_model_alias(provider_model_id: str, model_descriptor: str) -> ModelAli
     )
 
 
-class ModelLookup:
-    def __init__(
-        self,
-        model_aliases: List[ModelAlias],
-    ):
+class ModelRegistryHelper(ModelsProtocolPrivate):
+    def __init__(self, model_aliases: List[ModelAlias]):
         self.alias_to_provider_id_map = {}
         self.provider_id_to_llama_model_map = {}
         for alias_obj in model_aliases:
@@ -57,22 +53,12 @@ class ModelLookup:
         else:
             raise ValueError(f"Unknown model: `{identifier}`")
 
-
-class ModelRegistryHelper(ModelsProtocolPrivate):
-
-    def __init__(self, model_aliases: List[ModelAlias]):
-        self.model_lookup = ModelLookup(model_aliases)
-
     def get_llama_model(self, provider_model_id: str) -> str:
-        return self.model_lookup.provider_id_to_llama_model_map[provider_model_id]
+        return self.provider_id_to_llama_model_map[provider_model_id]
 
     async def register_model(self, model: Model) -> Model:
-        provider_model_id = self.model_lookup.get_provider_model_id(
+        model.provider_resource_id = self.get_provider_model_id(
             model.provider_resource_id
         )
-        if not provider_model_id:
-            raise ValueError(f"Unknown model: `{model.provider_resource_id}`")
-
-        model.provider_resource_id = provider_model_id
 
         return model