Are you referring to the Ricci notation when you are saying it uses a different representation of the tensors?
Do you also plan to add non-differentiable functions like relu?
Yeah, I am referring to Ricci notation. TF and PyTorch don't use it. The new version already has relus. This version is targeted at standard formulas (has abs as a non-differentiable function), next version works for deep learning. Never wanted to work on this but there is just no way around it.