app.py

"""Reproduction for gradio-app/gradio#13675.

Three ways a Gradio component used as chat content breaks:

  1. Any component built inside a `with gr.Blocks()` block. On a broken release
     this raises before the app starts, so it is checked here in a try/except
     and the outcome is shown in the app.
  2. A `gr.Plot` holding a bokeh figure returned from a chat function.
  3. The same plot wrapped in a `gr.ChatMessage` so it renders as a thought,
     which takes a different route out of the chat function.

On a broken release, sending a message fails. Which deep copy raises first
depends on what the chat function returns: a bare component blows up in the
queue after the prediction, so the browser gets no reply at all and the spinner
keeps going, while a component wrapped in a `gr.ChatMessage` blows up inside the
prediction and surfaces as an error.
"""

import bokeh.plotting

import gradio as gr


def check_component_as_initial_value() -> str:
    try:
        with gr.Blocks():
            message = {"role": "assistant", "content": gr.Plot()}
            gr.Chatbot(value=[message])
        return "**Case 1** — a component in a `gr.Chatbot`'s initial value: **works**"
    except Exception as e:
        return (
            "**Case 1** — a component in a `gr.Chatbot`'s initial value: "
            f"**fails** with `{type(e).__name__}: {e}`"
        )


def make_plot():
    fig = bokeh.plotting.figure(title="Bokeh plot in a chat message", width=600)
    fig.line(x=[1, 2, 3, 4], y=[1, 4, 9, 16])
    return gr.Plot(fig)


def respond(message, history):
    return [
        gr.ChatMessage(role="assistant", content="Case 2 — a bare `gr.Plot`:"),
        make_plot(),
        gr.ChatMessage(
            role="assistant",
            content=make_plot(),
            metadata={"title": "Case 3 — the same plot as a thought"},
        ),
    ]


demo = gr.ChatInterface(
    respond,
    title="gradio#13675 — a Gradio component as chat content",
    description=(
        check_component_as_initial_value()
        + "\n\n**Cases 2 and 3** — send any message. On a broken release the "
        "request fails; once fixed, two plots appear, one as a normal message "
        "and one inside a thought."
    ),
)

if __name__ == "__main__":
    demo.launch(ssr_mode=False)