add validation for unique llm names

arch/tools/cli/config_generator.py

@@ -80,7 +80,17 @@ def validate_and_render_schema():
     llms_with_endpoint = []
 
     updated_llm_providers = []
+    llm_provider_name_set = set()
     for llm_provider in config_yaml["llm_providers"]:
+        if llm_provider.get("name") in llm_provider_name_set:
+            raise Exception(
+                f"Duplicate llm_provider name {llm_provider.get('name')}, please provide unique name for each llm_provider"
+            )
+        if llm_provider.get("name") is None:
+            raise Exception(
+                f"llm_provider name is required, please provide name for llm_provider"
+            )
+        llm_provider_name_set.add(llm_provider.get("name"))
         provider = None
         if llm_provider.get("provider") and llm_provider.get("provider_interface"):
             raise Exception(

demos/use_cases/preference_based_routing/arch_config.yaml

@@ -17,17 +17,12 @@ llm_providers:
     model: cotran2/llama-4-epoch
     base_url: http://34.46.85.85:8000/v1
 
-  - name: gpt-4o
-    provider_interface: openai
-    access_key: $OPENAI_API_KEY
-    model: gpt-4o
-    default: true
-
   - name: gpt-4o
     provider_interface: openai
     access_key: $OPENAI_API_KEY
     model: gpt-4o
     usage: Generating original content such as scripts, articles, or creative materials.
+    default: true
 
   - name: o4-mini
     provider_interface: openai