def __init__(self, counter_name, delta=1):
    self.counter_name = counter_name
    self.delta = delta
should work like a linear KF if problem is linear
dataset/ETHPy150Open livid/v2ex/mapreduce/operation/counters.py/Increment.__init__--crossover with--dataset/ETHPy150Open rlabbe/filterpy/filterpy/kalman/tests/test_ukf.py/test_linear_2d