def check(self):
        raise NotImplementedError
Topologically sort a DAG, represented by a dict of child => set of parents.
dataset/ETHPy150Open cyberdelia/metrology/metrology/instruments/healthcheck.py/HealthCheck.check--crossover with--dataset/ETHPy150Open dougalsutherland/py-sdm/sdm/np_divs.py/topological_sort