the 730 card is a special and rare case. It comes in both a 3.5 variant and a 2.1 variant.
Reference: https://developer.nvidia.com/cuda-gpus 126
I suspect that you have the 2.1 variant.
We compile pytorch binaries for
3.0;3.5;5.0;5.2+PTX;6.0;6.1
If you indeed do have the 2.1 variant (which is a bit old), you might want to compile from source:

  
      
      GitHub
  
  
    

pytorch/pytorch 82

Tensors and Dynamic neural networks in Python with strong GPU acceleration - pytorch/pytorch