プログラムをフリーズしてexを生成しない場合は、「freeze_support（）」行を省略できます。

PyTorch错误：実行可能ファイルを生成するためにプログラムをフリーズしない場合は、「freeze_support（）」行を省略できます。
错误代码如下：

RuntimeError: 
        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.RuntimeError: 
        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.

解決

実行するコードブロックを実行するmain関数に配置します。

if __name__ == '__main__':
	#your code