Per the Pytorch website, you can install pytorch-cpu with
conda install pytorch-cpu torchvision-cpu -c pytorch
You can see from the files on Anaconda cloud, that the size varies between 26 and 56MB depending on the OS where you want to install it.
You can get the wheel from http://download.pytorch.org/whl/cpu/.
The wheel is 87MB.
You can setup the installation by putting the link to the wheel in the requirements.txt file. If you use Python 3.6 on Heroku:
http://download.pytorch.org/whl/cpu/torch-0.4.1-cp36-cp36m-linux_x86_64.whl
otherwise, for Python 2.7:
http://download.pytorch.org/whl/cpu/torch-0.4.1-cp27-cp27mu-linux_x86_64.whl
For example if your requirements are pytorch-cpu, numpy and scipy and you’re using Python 3.6, the requirements.txt would look like:
http://download.pytorch.org/whl/cpu/torch-0.4.1-cp36-cp36m-linux_x86_64.whl
numpy
scipy