def __init__(self, lookback=30):
        self.lookback = int(lookback)  # support of exponential smoother, only use this many data points in computation
        self.efold = 1.0
        self.gcv_grid = np.zeros(2.0 * self.lookback)
        self.efold_grid = np.zeros(2.0 * self.lookback)
Return a list of source lines and starting line number for an object.
dataset/ETHPy150Open brandonckelly/bck_stats/bck_stats/gcv_smoother.py/GcvExpSmoother.__init__--crossover with--dataset/ETHPy150Open azoft-dev-team/imagrium/env/Lib/inspect.py/getsourcelines