Python 如何在烧瓶中嵌入nnv图？

我想在flask中嵌入一个nnv渲染，但我的代码似乎没有渲染神经网络图

我的代码：

from nnv import NNV

layersList = [
    {"title":"input", "units": 3, "color": "darkBlue"},
    {"title":"hidden\nlayer", "units": 3},
    {"title":"output", "units": 6,"color": "darkBlue"},
]




from flask import Flask

app = Flask(__name__)

@app.route('/')
def index():
  return f"{NNV(layersList).render()}"

if __name__ == '__main__':
    app.run()

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问题是matplotlib用于绘制神经网络图；为了将图像作为HTTP响应返回，需要将绘图转换为字节

import io
from flask import Flask, Response

@app.route('/')
def index():
    output = io.BytesIO()
    NNV(layersList).render(save_to_file=output)
    return Response(output.getvalue(), mimetype='image/png')

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谢谢你，克里斯萨尔