The main file, which exposes the robustness command-line tool, detailed in this walkthrough.
Given arguments from setup_args and a store from setup_store, trains as a model. Check out the argparse object in this file for argument options.
Fill the args object with reasonable defaults from
robustness.defaults, and also perform a sanity check to make sure no args are missing.
Sets up a store for training according to the arguments object. See the argparse object above for options.