继续【Gradio的重要函数以及一些代码示例学习（一）】

---

1 fastapi+gradio的联合使用：mount_gradio_app

1.1 mount_gradio_app一个页面两个模块

分页的效果实现，主要依靠mount_gradio_app，启发于：Support multiple pages in a gradio app

from fastapi import FastAPI
from fastapi.responses import HTMLResponse
import gradio as gr

app = FastAPI()

HELLO_ROUTE = "/hello"
GOODBYE_ROUTE = "/goodbye"
iframe_dimensions = "height=300px width=1000px"

index_html = f'''
<h1>Put header here</h1>

<h3>
You can mount multiple gradio apps on a single FastAPI object for a multi-page app.
However if you mount a gradio app downstream of another gradio app, the downstream
apps will be stuck loading. 
</h3>

<h3>
So in particular if you mount a gradio app at the index route "/", then all your 
other mounted gradio apps will be stuck loading. But don't worry, you can still embed
your downstream gradio apps into the index route using iframes like I do here. In fact,
you probably want to do this anyway since its your index page, which you want to detail 
more fully with a jinja template. 
For a full example, you can see my <a href=https://yfu.one/>generative avatar webapp</a>
</h3>

<div>
<iframe src={HELLO_ROUTE} {iframe_dimensions}></iframe>
</div>

<div>
<iframe src={GOODBYE_ROUTE} {iframe_dimensions}></iframe>
</div>

'''

@app.get("/", response_class=HTMLResponse)
def index():
    return index_html


hello_app = gr.Interface(lambda x: "Hello, " + x + "!", "textbox", "textbox")
goodbye_app = gr.Interface(lambda x: "Goodbye, " + x + "!", "textbox", "textbox")


app = gr.mount_gradio_app(app, hello_app, path=HELLO_ROUTE)
app = gr.mount_gradio_app(app, goodbye_app, path=GOODBYE_ROUTE)

if __name__ == "__main__":
    import uvicorn
    uvicorn.run(app)
    
    

此时通过mount_gradio_app在fastapi同时部署两个模块，来看一下例子：

1.2 mount_gradio_app两个页面两个模块

启发于：230902-部署Gradio到已有FastAPI及服务器中

import gradio as gr


def greet(text: str) -> str:
    return text


demo1 = gr.Interface(
    fn=greet,
    inputs=gr.components.Textbox(label='Input-1'),
    outputs=gr.components.Textbox(label='Output-1'),
    allow_flagging='never'
)

demo2 = gr.Interface(
    fn=greet,
    inputs=gr.components.Textbox(label='Input-2'),
    outputs=gr.components.Textbox(label='Output-2'),
    allow_flagging='never'
)



from fastapi import FastAPI
import gradio as gr



app = FastAPI()

@app.get('/')
async def root():
    return 'Gradio app is running at /gradio', 200

app = gr.mount_gradio_app(app, demo1, path='/gradio1')
app = gr.mount_gradio_app(app, demo2, path='/gradio2')

import uvicorn
uvicorn.run(app)

这里定义了两个gradio模块，demo1和demo2，通过mount_gradio_app，映射到两个子路径，gradio1和gradio2
所以这里，需要通过http://127.0.0.1:8000/gradio2/和http://127.0.0.1:8000/gradio1/ 到达两个页面：

---

2 TabbedInterface组件进行选项卡布局

官方教程：tabbedinterface

启发于：Gradio使用介绍 和 优雅组合，高效交互：Gradio Combining Interfaces模块解析
TabbedInterface可以通过提供一个Interface列表来创建，每个Interface都会在一个单独的选项卡中显示。您可以根据需要为每个选项卡指定名称，也可以使用默认的"Tab 1"、"Tab 2"等名称。
几个参数的构成：

2.1 Parallel：并行比较案例

Parallel可以将多个接口并行比较它们的输出。要将接口放在Parallel中，它们必须共享相同的输入组件，但可以有不同的输出组件。

import gradio as gr

greeter_1 = gr.Interface(lambda name: f"Hello {name}!", inputs="textbox", outputs=gr.Textbox(label="Greeter 1"))
greeter_2 = gr.Interface(lambda name: f"Greetings {name}!", inputs="textbox", outputs=gr.Textbox(label="Greeter 2"))
demo = gr.Parallel(greeter_1, greeter_2)

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

可以看到一个输入，两个输出

2.2 Series：串行连接

Series可以将多个接口串行连接在一起，将一个接口的输出作为下一个接口的输入。要使用Series，接口之间的输入和输出组件必须匹配。

示例用法：

import gradio as gr

get_name = gr.Interface(lambda name: name, inputs="textbox", outputs="textbox")
prepend_hello = gr.Interface(lambda name: f"Hello {name}!", inputs="textbox", outputs="textbox")
append_nice = gr.Interface(lambda greeting: f"{greeting} Nice to meet you!",
                           inputs="textbox", outputs=gr.Textbox(label="Greeting"))
demo = gr.Series(get_name, prepend_hello, append_nice)

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

两个组件可以联动

2.3 第三个TabbedInterface的案例：

import gradio as gr
css = """
#warning {background-color: #FFCCCB}
.feedback textarea {font-size: 24px !important}
"""
 
with gr.Blocks(css=css) as demo1:
    with gr.Row():
        with gr.Column(scale=1):
            gr.Textbox(label="name", elem_id="warning")
            gr.Textbox(label="age", elem_classes="feedback")
        with gr.Column(scale=2):
            gr.Dropdown(["one", "two", "tree"], label="class")
            gr.CheckboxGroup(["male", "female"], label="sex")
        with gr.Column(scale=1):
            gr.Radio(["is_girl"], label="is_girl")
            gr.Slider(1, 100, 20)
    with gr.Row():
        gr.Button(value="Submit")
        gr.Button(value="Clear")


with gr.Blocks(css=css) as demo2:
    with gr.Row():
        with gr.Column(scale=1):
            gr.Textbox(label="name", elem_id="warning")
            gr.Textbox(label="age", elem_classes="feedback")
        with gr.Column(scale=2):
            gr.Dropdown(["one", "two", "tree"], label="class")
            gr.CheckboxGroup(["male", "female"], label="sex")
        with gr.Column(scale=1):
            gr.Radio(["is_girl"], label="is_girl")
            gr.Slider(1, 100, 20)
    with gr.Row():
        gr.Button(value="Submit")
        gr.Button(value="Clear")


app = gr.TabbedInterface([demo1, demo2], ["First", "Second"])
app.launch()

如果应用的并发流量很大，gradio还提供排队处理机制,在demo.queue()中可以指定并发处理数量，例如

with gr.Blocks() as demo:
    #...
demo.queue(concurrency_count=3)
demo.launch()

最终的效果为：

可以看到最上面有两个选项可以选择不同的控件组成

3 未测试

分页的效果实现，主要依靠mount_gradio_app，启发于：Support multiple pages in a gradio app

import gradio as gr

gr.Blocks():
  gr.Page("My amazing page", route="/"):
    gr.Markdown("# My amazing page")
    gr.Textbox("Page one")
  gr.Page("My second amazing page", route="/page-two"):
    gr.Markdown("# My second amazing page")
    gr.Textbox("Page two")