def _estimate_count(self):
        """ Update the count number using the estimation of the unset ratio """
        if self.estimate_z == 0:
            self.estimate_z = (1.0 / self.nbr_bits)
        self.estimate_z = min(self.estimate_z, 0.999999)
        self.count = int(-(self.nbr_bits / self.nbr_slices) * np.log(1 - self.estimate_z))
Update the count number using the estimation of the unset ratio