Add rerank API for NVIDIA Inference Provider

llama_stack/core/routers/inference.py

@@ -41,9 +41,14 @@ from llama_stack.apis.inference import (
     OpenAIMessageParam,
     OpenAIResponseFormatParam,
     Order,
+    RerankResponse,
     StopReason,
     ToolPromptFormat,
 )
+from llama_stack.apis.inference.inference import (
+    OpenAIChatCompletionContentPartImageParam,
+    OpenAIChatCompletionContentPartTextParam,
+)
 from llama_stack.apis.models import Model, ModelType
 from llama_stack.apis.telemetry import MetricEvent, MetricInResponse, Telemetry
 from llama_stack.log import get_logger
@@ -179,6 +184,25 @@ class InferenceRouter(Inference):
             raise ModelTypeError(model_id, model.model_type, expected_model_type)
         return model
 
+    async def rerank(
+        self,
+        model: str,
+        query: str | OpenAIChatCompletionContentPartTextParam | OpenAIChatCompletionContentPartImageParam,
+        items: list[str | OpenAIChatCompletionContentPartTextParam | OpenAIChatCompletionContentPartImageParam],
+        max_num_results: int | None = None,
+    ) -> RerankResponse:
+        """Route rerank requests to the appropriate provider based on the model."""
+        logger.debug(f"InferenceRouter.rerank: {model}")
+        model_obj = await self._get_model(model, ModelType.rerank)
+        provider = await self.routing_table.get_provider_impl(model_obj.identifier)
+        return await provider.rerank(
+            model=model_obj.identifier,
+            query=query,
+            items=items,
+            max_num_results=max_num_results,
+        )
+
+
     async def openai_completion(
         self,
         model: str,