add example to rerank docs

libs/ai-endpoints/langchain_nvidia_ai_endpoints/reranking.py

@@ -79,7 +79,55 @@ def __init__(self, **kwargs: Any):
         API Key:
         - The recommended way to provide the API key is through the `NVIDIA_API_KEY`
             environment variable.
+
+        Example:
+        >>> from langchain_nvidia_ai_endpoints import NVIDIARerank
+        >>> from langchain_core.documents import Document
+
+        >>> query = "What is the GPU memory bandwidth of H100 SXM?"
+        >>> passages = [
+                "The Hopper GPU is paired with the Grace CPU using NVIDIA's ultra-fast
+                chip-to-chip interconnect, delivering 900GB/s of bandwidth, 7X faster
+                than PCIe Gen5. This innovative design will deliver up to 30X higher
+                aggregate system memory bandwidth to the GPU compared to today's fastest
+                servers and up to 10X higher performance for applications running
+                terabytes of data.",
+
+                "A100 provides up to 20X higher performance over the prior generation
+                and can be partitioned into seven GPU instances to dynamically adjust to
+                shifting demands. The A100 80GB debuts the world's fastest memory
+                bandwidth at over 2 terabytes per second (TB/s) to run the largest
+                models and datasets.",
+
+                "Accelerated servers with H100 deliver the compute power—along with 3
+                terabytes per second (TB/s) of memory bandwidth per GPU and scalability
+                with NVLink and NVSwitch™.",
+            ]
+
+        >>> client = NVIDIARerank(
+                model="nvidia/nv-rerankqa-mistral-4b-v3",
+                api_key="$API_KEY_REQUIRED_IF_EXECUTING_OUTSIDE_NGC"
+            )
+
+        >>> response = client.compress_documents(
+                query=query,
+                documents=[Document(page_content=passage) for passage in passages]
+            )
+
+        >>> print(f"Most relevant: {response[0].page_content}\n"
+                  f"Least relevant: {response[-1].page_content}"
+            )
+
+        Most relevant: Accelerated servers with H100 deliver the compute power—along
+        with 3 terabytes per second (TB/s) of memory bandwidth per GPU and scalability
+        with NVLink and NVSwitch™.
+        Least relevant: A100 provides up to 20X higher performance over the prior
+        generation and can be partitioned into seven GPU instances to dynamically
+        adjust to shifting demands. The A100 80GB debuts the world's fastest memory
+        bandwidth at over 2 terabytes per second (TB/s) to run the largest models
+        and datasets.
         """
+
         super().__init__(**kwargs)
         self._client = _NVIDIAClient(
             base_url=self.base_url,