Revert "huggingface[patch]: make HuggingFaceEndpoint serializable (#2… (

#27032)

…7027)"

This reverts commit b5e28d3.

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

@@ -4,19 +4,14 @@
 import os
 from typing import Any, AsyncIterator, Dict, Iterator, List, Mapping, Optional
 
-from huggingface_hub import (  # type: ignore[import-untyped]
-    AsyncInferenceClient,
-    InferenceClient,
-    login,
-)
 from langchain_core.callbacks import (
     AsyncCallbackManagerForLLMRun,
     CallbackManagerForLLMRun,
 )
 from langchain_core.language_models.llms import LLM
 from langchain_core.outputs import GenerationChunk
-from langchain_core.utils import get_pydantic_field_names, secret_from_env
-from pydantic import ConfigDict, Field, SecretStr, model_validator
+from langchain_core.utils import from_env, get_pydantic_field_names
+from pydantic import ConfigDict, Field, model_validator
 from typing_extensions import Self
 
 logger = logging.getLogger(__name__)
@@ -78,12 +73,10 @@ class HuggingFaceEndpoint(LLM):
     should be pass as env variable in `HF_INFERENCE_ENDPOINT`"""
     repo_id: Optional[str] = None
     """Repo to use. If endpoint_url is not specified then this needs to given"""
-    huggingfacehub_api_token: Optional[SecretStr] = Field(
-        default_factory=secret_from_env(
-            ["HUGGINGFACEHUB_API_TOKEN", "HF_TOKEN"], default=None
-        )
+    huggingfacehub_api_token: Optional[str] = Field(
+        default_factory=from_env("HUGGINGFACEHUB_API_TOKEN", default=None)
     )
-    max_new_tokens: int = Field(default=512, alias="max_tokens")
+    max_new_tokens: int = 512
     """Maximum number of generated tokens"""
     top_k: Optional[int] = None
     """The number of highest probability vocabulary tokens to keep for
@@ -123,15 +116,14 @@ class HuggingFaceEndpoint(LLM):
     model_kwargs: Dict[str, Any] = Field(default_factory=dict)
     """Holds any model parameters valid for `call` not explicitly specified"""
     model: str
-    client: Any = Field(default=None, exclude=True)  #: :meta private:
-    async_client: Any = Field(default=None, exclude=True)  #: :meta private:
+    client: Any = None  #: :meta private:
+    async_client: Any = None  #: :meta private:
     task: Optional[str] = None
     """Task to call the model with.
     Should be a task that returns `generated_text` or `summary_text`."""
 
     model_config = ConfigDict(
         extra="forbid",
-        populate_by_name=True,
     )
 
     @model_validator(mode="before")
@@ -197,23 +189,36 @@ def build_extra(cls, values: Dict[str, Any]) -> Any:
     @model_validator(mode="after")
     def validate_environment(self) -> Self:
         """Validate that package is installed and that the API token is valid."""
-        if self.huggingfacehub_api_token is not None:
+        try:
+            from huggingface_hub import login  # type: ignore[import]
+
+        except ImportError:
+            raise ImportError(
+                "Could not import huggingface_hub python package. "
+                "Please install it with `pip install huggingface_hub`."
+            )
+
+        huggingfacehub_api_token = self.huggingfacehub_api_token or os.getenv(
+            "HF_TOKEN"
+        )
+
+        if huggingfacehub_api_token is not None:
             try:
-                login(token=self.huggingfacehub_api_token.get_secret_value())
+                login(token=huggingfacehub_api_token)
             except Exception as e:
                 raise ValueError(
                     "Could not authenticate with huggingface_hub. "
                     "Please check your API token."
                 ) from e
 
+        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=self.huggingfacehub_api_token.get_secret_value()
-            if self.huggingfacehub_api_token
-            else None,
+            token=huggingfacehub_api_token,
             **{
                 key: value
                 for key, value in self.server_kwargs.items()
@@ -225,9 +230,7 @@ def validate_environment(self) -> Self:
         self.async_client = AsyncInferenceClient(
             model=self.model,
             timeout=self.timeout,
-            token=self.huggingfacehub_api_token.get_secret_value()
-            if self.huggingfacehub_api_token
-            else None,
+            token=huggingfacehub_api_token,
             **{
                 key: value
                 for key, value in self.server_kwargs.items()
@@ -423,15 +426,3 @@ async def _astream(
             # break if stop sequence found
             if stop_seq_found:
                 break
-
-    @classmethod
-    def is_lc_serializable(cls) -> bool:
-        return True
-
-    @classmethod
-    def get_lc_namespace(cls) -> list[str]:
-        return ["langchain_huggingface", "llms"]
-
-    @property
-    def lc_secrets(self) -> dict[str, str]:
-        return {"huggingfacehub_api_token": "HUGGINGFACEHUB_API_TOKEN"}