Returns the length of the longest consecutive subsequence in x that is smaller than the mean of x

    :param x: the time series to calculate the feature of
    :type x: numpy.ndarray
    :return: the value of this feature
    :return type: float

def longest_strike_below_mean(x):
    """
    Returns the length of the longest consecutive subsequence in x that is smaller than the mean of x

    :param x: the time series to calculate the feature of
    :type x: numpy.ndarray
    :return: the value of this feature
    :return type: float
    """
    if not isinstance(x, (np.ndarray, pd.Series)):
        x = np.asarray(x)
    return np.max(_get_length_sequences_where(x <= np.mean(x))) if x.size > 0 else 0