报错信息RuntimeError: Trying to backward through the graph a second time, but the buffers have already been freed. Specify

Pytorch踩坑：Trying to backward through the graph a second time, but the buffers have already been freed. Specif

RuntimeError: Trying to backward through the graph a second time, but the buffers have already been freed 遇到过几次这个报错了&am

问题: 训练模型的时候碰到报错 RuntimeError: Trying to backward through the graph a second time, but the buffers have already been free