def __init__(self, initial_clock=None, comparer=None):

        def compare_datetimes(a, b):
            return (a > b) - (a < b)

        clock = initial_clock or datetime.fromtimestamp(0)
        comparer = comparer or compare_datetimes

        super(HistoricalScheduler, self).__init__(clock, comparer)
Return the most similar users to the given user, ordered
dataset/ETHPy150Open ReactiveX/RxPY/rx/concurrency/historicalscheduler.py/HistoricalScheduler.__init__--crossover with--dataset/ETHPy150Open muricoca/crab/scikits/crab/recommenders/knn/base.py/UserRecommender.most_similar_users