Pass value of HF_TOKEN environment variable when loading models with gr.load (#10092)

* verbose

* add changeset

* changes

* maybe fix

* add changeset

* changes

* add changeset

---------

Co-authored-by: gradio-pr-bot <gradio-pr-bot@users.noreply.github.com>

.changeset/tall-maps-pump.md

@@ -0,0 +1,5 @@
+---
+"gradio": minor
+---
+
+feat:Pass value of `HF_TOKEN` environment variable when loading models with `gr.load`

gradio/components/chatbot.py

@@ -422,9 +422,7 @@ class Chatbot(Component):
     def preprocess(
         self,
         payload: ChatbotDataTuples | ChatbotDataMessages | None,
-    ) -> (
-        list[list[str | tuple[str] | tuple[str, str] | None]] | list[MessageDict] | None
-    ):
+    ) -> list[list[str | tuple[str] | tuple[str, str] | None]] | list[MessageDict]:
         """
         Parameters:
             payload: data as a ChatbotData object
@@ -432,7 +430,7 @@ class Chatbot(Component):
             If type is 'tuples', passes the messages in the chatbot as a `list[list[str | None | tuple]]`, i.e. a list of lists. The inner list has 2 elements: the user message and the response message. Each message can be (1) a string in valid Markdown, (2) a tuple if there are displayed files: (a filepath or URL to a file, [optional string alt text]), or (3) None, if there is no message displayed. If type is 'messages', passes the value as a list of dictionaries with 'role' and 'content' keys. The `content` key's value supports everything the `tuples` format supports.
         """
         if payload is None:
-            return payload
+            return []
         if self.type == "tuples":
             if not isinstance(payload, ChatbotDataTuples):
                 raise Error("Data incompatible with the tuples format")

gradio/external.py

@@ -49,7 +49,7 @@ def load(
     Parameters:
         name: the name of the model (e.g. "google/vit-base-patch16-224") or Space (e.g. "flax-community/spanish-gpt2"). This is the first parameter passed into the `src` function. Can also be formatted as {src}/{repo name} (e.g. "models/google/vit-base-patch16-224") if `src` is not provided.
         src: function that accepts a string model `name` and a string or None `token` and returns a Gradio app. Alternatively, this parameter takes one of two strings for convenience: "models" (for loading a Hugging Face model through the Inference API) or "spaces" (for loading a Hugging Face Space). If None, uses the prefix of the `name` parameter to determine `src`.
-        token: optional token that is passed as the second parameter to the `src` function. For Hugging Face repos, uses the local HF token when loading models but not Spaces (when loading Spaces, only provide a token if you are loading a trusted private Space as the token can be read by the Space you are loading). Find HF tokens here: https://huggingface.co/settings/tokens.
+        token: optional token that is passed as the second parameter to the `src` function. If not explicitly provided, will use the HF_TOKEN environment variable or fallback to the locally-saved HF token when loading models but not Spaces (when loading Spaces, only provide a token if you are loading a trusted private Space as the token can be read by the Space you are loading). Find your HF tokens here: https://huggingface.co/settings/tokens.
         accept_token: if True, a Textbox component is first rendered to allow the user to provide a token, which will be used instead of the `token` parameter when calling the loaded model or Space.
         kwargs: additional keyword parameters to pass into the `src` function. If `src` is "models" or "Spaces", these parameters are passed into the `gr.Interface` or `gr.ChatInterface` constructor.
     Returns:
@@ -78,6 +78,12 @@ def load(
         raise ValueError(
             "The `src` parameter must be one of 'huggingface', 'models', 'spaces', or a function that accepts a model name (and optionally, a token), and returns a Gradio app."
         )
+    if (
+        token is None
+        and src in ["models", "huggingface"]
+        and os.environ.get("HF_TOKEN") is not None
+    ):
+        token = os.environ.get("HF_TOKEN")
 
     if not accept_token:
         if isinstance(src, Callable):