AttributeError: 'tuple' object has no attribute 'log_softmax'
while trying to finetune inception_V3 for my own dataset by changing the last fc layer like 

last_layer =nn.Linear(n_inputs, len(classes))
inception_v3.fc = last_layer


after that when I train it got this error on this position

    # on training loop
    output = inception_v3(data)
    # calculate the batch loss
    loss = criterion(output, target)


Error is 

 AttributeError: 'tuple' object has no attribute 'log_softmax'


This is a well known problem.  

Try one the following solutions:  


disable aux_logits when the model is created here by also passing aux_logits=False to the inception_v3 function.
edit your train function to accept and unpack the returned tuple to be something like: output, aux = model(input_var)


Check the following link for more info.
