Is it possible to expose the exp map to the Python API via a logsignature_to_signature function?

[Mithrillion]

Is it possible to expose the exp map to the Python API via a logsignature_to_signature function?

[patrick-kidger]

Signatory's exp map only takes in a path increment; not a generic logsignature. I'm afraid Signatory does not implement a full logsig-to-sig conversion.

As another alternate solution, you could do all of your operations on the signature, and then just convert sig-to-logsig whenever you need the latter.

[Mithrillion]

This is a bit unfortunate... But I guess I can take the iisignature detour for now, while looking for a PyTorch-compatible solution or trying to port an existing solution.

For my use case I really need to do my operations on the logsignature, as I am trying to find a way to scale or "average" signatures such that they do not leave the domain of "well-defined signatures" . The average of two signatures is likely not a valid signature, therefore I have to do so in the logsignature domain. I then would like to do normal operations like concatenation afterwards, so it would be helpful to return it to the signature domain.

But thanks anyway. Now I know a little bit more about how signatory works internally.