一、异常1：RuntimeError: An attempt has been made to start a new process
原因：多进程需要在main函数中运行
解决方法1：
加main函数，在main中调用
if __name__ == '__main__':
main()
解决方法2：
num_workers改为0，单进程加载
ers改为0，单进程加载
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