João P. Moutinho

Also came accross this one: https://arxiv.org/pdf/1907.09040.pdf

Closing after opening in PyQTorch: https://github.com/pasqal-io/pyqtorch/issues/177

Adding `to_check` label since it's being developed now but it still needs to be properly checked in the new expression system.

Thanks @vytautas-a! This is a good start! > Do we create a separate backend for Schrodinger equation solvers or integrate them into pyq? I also think integrating something into PyQ...

This is potentially needed to deal with the domain of certain functions in https://github.com/pasqal-io/qadence/issues/267 E.g., the trainable frequencies for a chebyshev feature map should respect the domain of `acos` being...

@smitchaudhary I guess a question is if it's worth keeping both options. I guess the QNN option is only relevant if someone uses their own custom feature map right?

> @dominikandreasseitz I have changed the observable config and added the functionality to automatically scale the output This happens in a manner similar that is similar to what happens with...

@smitchaudhary Indeed you are correct if we only keep single-qubit terms then `X` or `Y` is still ok, the range is the same as `Z`. I don't understand the need...

@smitchaudhary thanks, and sorry for not commenting on this before. Generally I agree with what you said, mainly to have it behave like the current defaults for the contructors. I...

Thanks @smitchaudhary, I like the dict option!