Also please refer to this link here and try to follow the steps as per the blog

  
      
      Medium – 12 Dec 18
  
  
    

How to install PyTorch v4.0+ on Raspberry Pi-3B+, Odroids, and other ARM-based... 28

Installing Neural Network Frame Works on ‘ARM’ or ‘aarch’ based architectures are a real pain. Most of us reading here would have tried…

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The blog version is to install in Non-Cuda devices and hence a flag
export NO_CUDA=1 

is used, you can omit the use of this flag and follow all the other steps.