Hi albanD.
I encountered a similar issue “RuntimeError: cuDNN version mismatch: PyTorch was compiled against 7102 but linked against 7600”
How I understand this problem is that my code is compiled for cudnn 7.1.2  but try to run with cudnn 7.6.0. (Pls correct me if I am wrong) from your discussion.
I still haven’t solve this problem yet after referring to your discussion.
May I know more background knowledge like why you ask that three quesitons?
For my case:
I try to run my code under conda vitural env in a Ubuntu docker container.
In addition, I checked I have “/usr/local/cuda” but I am not sure if I also have in my local ptath(how can i check?).  And I got both “cuda” and “cuda-9.0” in the folder “/usr/local/”. What’s this mean?
Content of the /usr/local/cuda/lib64 folder:  “ls: cannot access ‘libcudnn*’: No such file or directory”. The same to cuda-9.0.
echo $LD_LIBRARY_PATH: /usr/local/nvidia/lib:/usr/local/nvidia/lib64
Thank you.