def create_default_groups(self):
        for group in self.groups:
            group = group.replace(" ", "_").lower()
            self[group] = NamedRequirements(group)
def initialize(self, init_type = ema_init_type.KMEANS_INITIALIZATION):
        """!
        @brief Calculates initial parameters for EM algorithm: means and covariances using
                specified strategy.