Mac使用DataLoader(dataset=voc_train, batch_size=64, shuffle=False, num_workers =4) 出错

Warning: Cannot set number of intraop threads after parallel work has started or after set_num_threads call when using native parallel backend (function set_num_threads)

Mac训练模型时候出错

参考链接：https://www.baidu.com/link?url=_5ApAU8v_mxyXNtb8UZWg6NXlvXEkGe0d0YeuFOSzaSWBQ4tygutrXFbkDEy4dIM1gsJguT0FjWN83QIXuIjR_IlGlSR1c9Vp5Sz7_XxVo-F4EHLjb9tALa_Sq1giWs2&wd=&eqid=c7e417a4000847bf0000000361795514

解决方法：

import os
os.environ["OMP_NUM_THREADS"] = "1"