AttributeError: 'NoneType' object has no attribute '_stop_serving'

在查看您提供的引用内容后，出现AttributeError: 'NoneType' object has no attribute '_stop_serving'的错误可能与graph.py文件中的一些问题相关。在optimize_graph函数中，有一个try-except语句块被注释掉了。这可能导致程序无法捕获和处理异常，从而引发AttributeError。另外，根据引用中的内容，如果fsspec的版本过低或者未安装，也可能导致该错误。您可以尝试安装或更新fsspec库来解决此问题。请参考引用中提供的安装指南。同时，您还可以查看引用中提供的GitHub问题页面，可能会有更多关于此错误的讨论和解决方案。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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