Gradio Dataset显示图片报错：'Image'对象无proxy_url属性

尝试在Gradio Dataset的行中显示图片时，触发错误：AttributeError: 'Image' object has no attribute 'proxy_url'，该错误源于Gradio内部实现。

环境版本 #

Python 3.11.11
Gradio 5.23.3

报错堆栈 #

File "src/test_001.py", line 18, in show_startup_quotes
    return gr.Dataset(
           ^^^^^^^^^^^
  File ".venv/lib/python3.11/site-packages/gradio/component_meta.py", line 182, in wrapper
    return fn(self, **kwargs)
           ^^^^^^^^^^^^^^^^^^
  File ".venv/lib/python3.11/site-packages/gradio/components/dataset.py", line 86, in __init__
    self.component_props = [
                           ^
  File ".venv/lib/python3.11/site-packages/gradio/components/dataset.py", line 88, in <listcomp>
    component.get_config(),
    ^^^^^^^^^^^^^^^^^^^^^^
  File ".venv/lib/python3.11/site-packages/gradio/components/base.py", line 245, in get_config
    config = super().get_config()
             ^^^^^^^^^^^^^^^^^^^^
  File ".venv/lib/python3.11/site-packages/gradio/blocks.py", line 266, in get_config
    config = {**config, "proxy_url": self.proxy_url, "name": self.get_block_class()}

复现代码 #

import gradio as gr
from PIL import Image

white_image = Image.new("RGBA", (16, 16), color=(0, 0, 0, 0))
red_image = Image.new("RGBA", (16, 16), color=(255, 0, 0, 255))

philosophy_quotes = [
    [white_image, "I think therefore I am."],
    [white_image, "The unexamined life is not worth living."]
]

startup_quotes = [
    [red_image, "Ideas are easy. Implementation is hard"],
    [red_image, "Make mistakes faster."]
]

def show_startup_quotes():
    return gr.Dataset(
        samples=startup_quotes,
        components=[
            gr.Image(type="pil"),
            gr.Text()
        ])

with gr.Blocks() as demo:
    textbox = gr.Textbox()
    image = gr.Image(visible=False,type="pil")
    dataset = gr.Dataset(components=[textbox, image], samples=philosophy_quotes)
    button = gr.Button()

    button.click(show_startup_quotes, None, dataset)

demo.launch()

解决提示 #

• 不要在回调函数中返回新的Dataset组件：Gradio的回调函数不应直接返回组件实例，而是应该更新现有组件的属性（比如samples）。原代码中show_startup_quotes试图返回新的gr.Dataset，这会导致未挂载的组件（gr.Image和gr.Text）缺少proxy_url属性，因为该属性只有组件被添加到Blocks后才会生成。
• 修改回调逻辑，仅更新samples参数：将回调函数改为返回新的samples数据，而非新组件。调整后的代码示例：

  def show_startup_quotes():
      return startup_quotes
  
  with gr.Blocks() as demo:
      textbox = gr.Textbox()
      image = gr.Image(visible=False,type="pil")
      dataset = gr.Dataset(components=[image, textbox], samples=philosophy_quotes)  # 注意组件顺序要和samples匹配
      button = gr.Button()
  
      button.click(show_startup_quotes, None, dataset)
  

• 确保组件顺序与samples一致：原代码中Dataset的components顺序是[textbox, image]，但samples中是[图片, 文本]，顺序不匹配会导致显示异常，需调整为[image, textbox]。

内容的提问来源于stack exchange，提问作者Veronica