An attempt has been made to start a new process before the current process

解决方法：

1.去掉num_workers参数（或者将num_workers=0）

你直接crtl+shift+F全局搜索num_workers，然后让它等于0就可以解决

2.在跑epoch之前，加上if __name__=='__main__':

可以看到我的控制台提示在test.py的for这里出错，那么此时我就加入if __name__=='__main__':，然后将for的代码块放进去

修改好的样子：

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