also, yuour sequential would be missing .view, as you correctly point out 
why do we need a view?
the convolution layers have tensors in layout something like (N,C,H,W), where:
- N => batchsize
- C => number of channels/features
- H => height of each image
- W => width of each image
The fc layers work on much more ‘squished’ dimensinos, something more ike (N, C):
- N => batchsie
- C => number of features/neurons
The view converts from one layout t o another