我如何解决此错误“元组”对象不是迭代器

我是AI的初学者,需要以下代码中的一些帮助。

valcall = val_images,Yval_images
traincall = train_images,Ytrain_images

callbacks = [
     EarlyStopping(monitor='val_loss', patience=15, verbose=1, min_delta=1e-5),
     ReduceLROnPlateau(monitor='val_loss', factor=0.1, patience=5, cooldown=0, verbose=1, min_lr=1e-8),
     ModelCheckpoint(monitor='val_loss', filepath='/content/drive/My Drive/TPU/testchange.hdf5', verbose=1,save_best_only=True, save_weights_only=True, mode='auto')

    ]

    model.fit_generator( traincall, epochs=epochs,steps_per_epoch=steps_per_epoch,verbose=1, callbacks=callbacks, validation_data=valcall)

我在训练模型时遇到此错误,我很困惑我需要更改对象中的哪个元组?请帮帮我,谢谢。

I am getting this error : enter image description here