huggingface; fix huggingface_endpoint.py (initialize clients only with supported kwargs) (#26378)

## Description

By default, `HuggingFaceEndpoint` instantiates both the
`InferenceClient` and the `AsyncInferenceClient` with the
`"server_kwargs"` passed as input. This is an issue as both clients
might not support exactly the same kwargs. This has been highlighted in
https://github.com/huggingface/huggingface_hub/issues/2522 by
@morgandiverrez with the `trust_env` parameter. In order to make
`langchain` integration future-proof, I do think it's wiser to forward
only the supported parameters to each client. Parameters that are not
supported are simply ignored with a warning to the user. From a
`huggingface_hub` maintenance perspective, this allows us much more
flexibility as we are not constrained to support the exact same kwargs
in both clients.

## Issue

https://github.com/huggingface/huggingface_hub/issues/2522

## Dependencies

None

## Twitter 

https://x.com/Wauplin

---------

Co-authored-by: Erick Friis <erick@langchain.dev>

libs/partners/huggingface/langchain_huggingface/llms/huggingface_endpoint.py

@@ -1,3 +1,4 @@
+import inspect
 import json  # type: ignore[import-not-found]
 import logging
 import os
@@ -212,17 +213,40 @@ class HuggingFaceEndpoint(LLM):
 
         from huggingface_hub import AsyncInferenceClient, InferenceClient
 
+        # Instantiate clients with supported kwargs
+        sync_supported_kwargs = set(inspect.signature(InferenceClient).parameters)
         self.client = InferenceClient(
             model=self.model,
             timeout=self.timeout,
             token=huggingfacehub_api_token,
-            **self.server_kwargs,
+            **{
+                key: value
+                for key, value in self.server_kwargs.items()
+                if key in sync_supported_kwargs
+            },
         )
+
+        async_supported_kwargs = set(inspect.signature(AsyncInferenceClient).parameters)
         self.async_client = AsyncInferenceClient(
             model=self.model,
             timeout=self.timeout,
             token=huggingfacehub_api_token,
-            **self.server_kwargs,
+            **{
+                key: value
+                for key, value in self.server_kwargs.items()
+                if key in async_supported_kwargs
+            },
+        )
+
+        ignored_kwargs = (
+            set(self.server_kwargs.keys())
+            - sync_supported_kwargs
+            - async_supported_kwargs
+        )
+        if len(ignored_kwargs) > 0:
+            logger.warning(
+                f"Ignoring following parameters as they are not supported by the "
+                f"InferenceClient or AsyncInferenceClient: {ignored_kwargs}."
             )
 
         return self