'How to solve 'Tensor' object has no attribute 'items' in Pytorch

I am running a python code in Pycharm and i used Pytorch for training. but i get this error

AttributeError: 'Tensor' object has no attribute 'items'

also my code is like this:

import pytorch_lightning as pl 
trainer = pl.Trainer(max_epochs=5, gpus=0, reload_dataloaders_every_epoch=True,
                 progress_bar_refresh_rate=50, logger=False, 

checkpoint_callback=False)

trainer.fit(model)

also this is the link of the full code that I'm trying to run Movie Recommender Systems Using Neural Network

Do you have any idea to solve this issue?

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'How to solve 'Tensor' object has no attribute 'items' in Pytorch

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