Trains model on inputs

        :param x_data: x matrix
        :param y_data: y array

def train(self, x_data, y_data):
        """Trains model on inputs

        :param x_data: x matrix
        :param y_data: y array
        """
        x_train, _, y_train, _ = train_test_split(
            x_data,
            y_data,
            test_size=0.67,
            random_state=None
        )  # cross-split

        self.model.fit(x_train, y_train)