AttributeError: 'tuple' object has no attribute 'backward'
Traceback (most recent call last):                                                                                                                                    | 0/11 [00:00<?, ?it/s] 
  File "examples/run_classifier.py", line 637, in <module>
    main()
  File "examples/run_classifier.py", line 558, in main
    loss.backward()
AttributeError: 'tuple' object has no attribute 'backward'

Looks like there was a code change which changed the forward method of the model involved here from returning a tensor to returning a tuple of tensors and the example hasn't been updated yet to reflect that change. There's probably a line in run_classifier.py like
```Python
loss = model(input...)
```
which now needs to be
```Python
loss, something_else = model(input...)
```<|||||>> Looks like there was a code change which changed the forward method of the model involved here from returning a tensor to returning a tuple of tensors and the example hasn't been updated yet to reflect that change. There's probably a line in run_classifier.py like
> 
> ```python
> loss = model(input...)
> ```
> 
> which now needs to be
> 
> ```python
> loss, something_else = model(input...)
> ```

You are right! Thx!