Calculate the moving overage over an array.

    Algorithm from: https://stackoverflow.com/a/14314054

    Args:
        arr (np.ndarray): Array over which to calculate the moving average.
        n (int): Number of elements over which to calculate the moving average. Default: 3
    Returns:
        np.ndarray: Moving average calculated over n.

def moving_average(arr: np.ndarray, n: int = 3) -> np.ndarray:
    """ Calculate the moving overage over an array.

    Algorithm from: https://stackoverflow.com/a/14314054

    Args:
        arr (np.ndarray): Array over which to calculate the moving average.
        n (int): Number of elements over which to calculate the moving average. Default: 3
    Returns:
        np.ndarray: Moving average calculated over n.
    """
    ret = np.cumsum(arr, dtype=float)
    ret[n:] = ret[n:] - ret[:-n]
    return ret[n - 1:] / n