Simple wrapper of model.fit.

        :param inputs: Inputs.
        :param outputs: List of forward and backward outputs.
        :param epochs: Number of epoch.

        :return: None

def fit(self, inputs, outputs, epochs=1):
        """Simple wrapper of model.fit.

        :param inputs: Inputs.
        :param outputs: List of forward and backward outputs.
        :param epochs: Number of epoch.

        :return: None
        """
        self.model.fit(inputs, outputs, epochs=epochs)