considering the repo doesn't contain a cc_binary build rule, I'm inclined to believe there's no demo, the easiest way to get started (if you want to play around

considering the repo doesn't contain a cc_binary build rule, I'm inclined to believe there's no demo, the easiest way to get started (if you want to play around from scratch) would be to add a cc_binary, point that to a main.cpp file which depends on the library targets you want, e.g "//in_memory/clustering:graph" and ensure there's sufficient visibility from the targets.