Windows执行机器学习任务报错 return self._get_iterator() An attempt has been made to start a new process before the current process has finished its bootstrapping phase. This probably means that you are not using fork to start your child processes and you have forgotten to use the proper idiom in the main module: if __name__ == '__main__': freeze_support() ... The "freeze_support()" line can be omitted if the program is not going to be frozen to produce an executable.

这个错误通常是由于在Windows系统上使用多进程处理时引起的。为了解决这个问题，你可以尝试在你的代码中添加以下代码：

if __name__ == '__main__':
    from multiprocessing import freeze_support
    freeze_support()

这段代码会检查当前脚本是否为主模块，如果是，则会调用 `freeze_support()` 函数。这个函数的作用是在Windows系统上启动多进程时，确保主进程能够正确地启动子进程。

如果你的程序不需要被冻结为可执行文件，则可以省略 `freeze_support()` 函数。