CTC详细推导
http://blog.prince2015.club/2020/03/30/ctc/
最好的CTC教程
https://www.youtube.com/watch?v=c86gfVGcvh4
n-1 方差 好教程
https://zhuanlan.zhihu.com/p/115184696
CPU: AMD EPYC 7H12
GPU: 8xA100 PCIE
docker: 20.10.12
cuda: 11.1
driver: 470.94
forward
backward
