The deploy.yaml deploys a Jupyter notebook environment, which is a popular user interface for data scientists today. More specifically, the deploy.yaml specifies the jupyter/tensorflow-notebook image that includes popular Python deep learning libraries, but one can easily swap it out with the various Jupyter environment images provided by Jupyter Docker Stacks.
Once deployed, the Jupyter notebook can be accessed at http:<HOSTED URI>. To obtain the access token, you would need to view the provider lease logs (i.e. via the CLI akash provider lease-logs command), and paste it into the input to authenticate.