Run AI2THOR in clusters as a non-root user

Hi,

I want to use AI2THOR on my university's cluster, where I am not allowed to start an x server as a non-root user. The docker image is also forbiddened on the cluster. I have searched for some potential solutions, but none of them work for me:

1. Ask the administrator to start the x server: they do not provide such a service.
2. Run AI2THOR in a singularity image. As mentioned in #686, it is unbearably slow to use a singularity image.

Just wondering is there any possibility for me to get the simulator to work in my case?

Thank you very much.