community[patch]: Remove model limitation on Anyscale LLM (#17662)

**Description:** Llama Guard is deprecated from Anyscale public
endpoint.
**Issue:** Change the default model. and remove the limitation of only
use Llama Guard with Anyscale LLMs
Anyscale LLM can also works with all other Chat model hosted on
Anyscale.
Also added `async_client` for Anyscale LLM

libs/community/langchain_community/llms/anyscale.py

@@ -24,10 +24,7 @@
 from langchain_community.utils.openai import is_openai_v1
 
 DEFAULT_BASE_URL = "https://api.endpoints.anyscale.com/v1"
-DEFAULT_MODEL = "Meta-Llama/Llama-Guard-7b"
-
-# Completion models support by Anyscale Endpoints
-COMPLETION_MODELS = ["Meta-Llama/Llama-Guard-7b"]
+DEFAULT_MODEL = "mistralai/Mixtral-8x7B-Instruct-v0.1"
 
 
 def update_token_usage(
@@ -113,12 +110,6 @@ def validate_environment(cls, values: Dict) -> Dict:
             "MODEL_NAME",
             default=DEFAULT_MODEL,
         )
-        if values["model_name"] not in COMPLETION_MODELS:
-            raise ValueError(
-                "langchain_community.llm.Anyscale ONLY works \
-            with completions models.For Chat models, please use \
-            langchain_community.chat_model.ChatAnyscale"
-            )
 
         try:
             import openai
@@ -135,7 +126,12 @@ def validate_environment(cls, values: Dict) -> Dict:
                     # "default_query": values["default_query"],
                     # "http_client": values["http_client"],
                 }
-                values["client"] = openai.OpenAI(**client_params).completions
+                if not values.get("client"):
+                    values["client"] = openai.OpenAI(**client_params).completions
+                if not values.get("async_client"):
+                    values["async_client"] = openai.AsyncOpenAI(
+                        **client_params
+                    ).completions
             else:
                 values["openai_api_base"] = values["anyscale_api_base"]
                 values["openai_api_key"] = values["anyscale_api_key"].get_secret_value()