actually besides http://fast.ai i always credit @chollet's DL book, starting with its very early draft; so the choice of Xception and use of Keras is due to the latter :)
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*Of course* you can design architectures that don't do downsampling (just don't include maxpooling or strides, and use "same" padding everywhere). And there are use cases for it. I'm just talking about every pre-trained architecture available out there.
This is completely unviable if you try to do image classification on relatively large inputs, btw.
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Sure, for classification problems, but not necessarily for language or image modelling or generation where you'd actually prefer to keep image sizes relatively stable in the network, or even enlarge them (eg super resolution).
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Sure, we're totally agreeing here.
End of conversation
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