No runtime warning. See the release notes for the breaking changes.
We realized after the release that it may have been better to spread the change to byte Tensors over two releases, but by that point it was too late (i.e. we could have deprecated ~ on byte tensors in 1.2 and change it to bitwise inversion for non-bool integer types in 1.3).

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