it does support aarch64 processor. Someone from NVIDIA wrote how to build it on their jetson platform:

  
      gist.github.com
  
  
    https://gist.github.com/dusty-nv/ef2b372301c00c0a9d3203e42fd83426 2.0k
pytorch_jetson_install.sh
#!/bin/bash
#
# pyTorch install script for NVIDIA Jetson TX1/TX2,
# from a fresh flashing of JetPack 2.3.1 / JetPack 3.0 / JetPack 3.1
#
# for the full source, see jetson-reinforcement repo:
#   https://github.com/dusty-nv/jetson-reinforcement/blob/master/CMakePreBuild.sh
#
# note:  pyTorch documentation calls for use of Anaconda,
#        however Anaconda isn't available for aarch64.
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