Source: pop-os/tensorman#10 (comment)
When launching a container, be sure to supply the port mappings argument to map the port from the container to the host.
tensorman run -p 8888:8888 --gpu --python3 --jupyter bash
Within the container, you may start the Jupyter notebook with
jupyter notebook --ip=0.0.0.0 --no-browser
Which will give you the address and token to use for accessing it from your host OS, like so: http://127.0.0.1:8888/?token=bb826e8887076ecf3b1912a5e8f848e8029773bb04ad4990