@staticmethod
def _check_targets(y_actual, y_predicted):
    """Check that y_actual and y_predicted have the same length.

        :param H2OFrame y_actual:
        :param H2OFrame y_predicted:

        :returns: None
        """
    if len(y_actual) != len(y_predicted):
        raise ValueError('Row mismatch: [{},{}]'.format(len(y_actual), len(
            y_predicted)))
