ypack is a utility package
cifar_model constructs and loads the model

the bulk of the code is in main.py
the various command line parameters steer the control flow, such as --mode to switch from training to eval, or --attack to change the type of adversarial attack used
the main parameters for our method are --ujv_reg to activate d.d.SNR and --train_adv_ratio to activate adversarial training