A toy markov model that produces plots that look somewhat like the precision-recall curves used to calculate mAP in object detection/instance segmentation. I made this because it was easier than getting zotero to cite some random blog properly. It doesn't simulate the underlying dynamics at all, but the output looks fairly convincing. This probably means it's an emulator rather than a simulator if you want to be picky.
Here's what the output looks like for the default parameters:
