I'm going to be building a deep learning rig and am considering using unraid as the host os.  In order to try and keep projects organized, I want to use docker applications (such as https://github.com/floydhub/dl-docker).  However, this requires nvidia-docker installed on the host.  Is this possible with unraid?  Or am I better off just installing docker ontop of some other linux distro like Ubuntu?

That is not going to be an easy task if you want to run it in a docker container. You first need to get the nvidia drivers installed on unraid, which means you will have to recompile the kernel and package it all up again. Then get all the dependencies for the drivers installed. 

The best solution is to run a vm and pass through the GPU and install docker on the vm. 

alright, thanks!