Build the estimator class.

        Returns
        -------
        :return : string
            The built class as string.

def create_class(self):
        """
        Build the estimator class.

        Returns
        -------
        :return : string
            The built class as string.
        """
        if self.target_language in ['java', 'go']:
            n_indents = 1 if self.target_language == 'java' else 0
            class_head_temp = self.temp('separated.{}.class'.format(
                self.prefix), n_indents=n_indents, skipping=True)
            self.class_head = class_head_temp.format(**self.__dict__)

        return self.temp('separated.class').format(**self.__dict__)