history = self._internal_model.fit_generator(
                generator=train_parameters.train_data_generator,
                steps_per_epoch=train_parameters.steps_per_epoch,
                validation_data=train_parameters.validation_data_generator,
                validation_steps=train_parameters.validation_steps,
                epochs=train_parameters.epochs,
                callbacks=callbacks,
                verbose=verbose,
                # TODO workers and use_multiprocessing fixed values
                workers=1,
                use_multiprocessing=False)