pytorchcv in_size argument

Hi thank you for wonderful DL networks repo.

I have one question to ask about pytorchcv 

in `pytorch/pytorchcv/models/squeezenext.py`  I found that SqueezeNext class has `in_size` argument but never being used. 

I would like to modify my input img size form `get_model` function by changing in_size argument. 

Is there any reason you are not using in_size argument currently?

