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)
Constructor for class to perform exponentially-weighted average smoothing of a 1-D data set.
dataset/ETHPy150Open brandonckelly/bck_stats/bck_stats/gcv_smoother.py/GcvExpSmoother.__init__