I run my code on GTX 1080 Ti and RTX 2080 Ti and found 2080 is slower than 1080. The time for one batch  of 1080 is around 1.9s while the time for 2080 is around 3.3s. I tried torch==1.2.0 and torch==1.1.0 and torchvision==0.4.0 and torchvision==0.2.0 but the results are similar. I do not understand. Anyone can help me?