Positive group lasso ?

[homerours]

Hi, thank you for this nice repo :)
Is there any way to use it to do positive group lasso, that is minimizing over vector with non-negative coefficients ?
In scikit-learn, there is a positive=True parameter that handles this. Is there such possibility here, or is there an easy way to solve this ? Thank you!

[yngvem]

That would be a very nice addition. However, while non-negativity constraints are very straightforward for LASSO, it is not straightforward to implement non negative group lasso.

It seems like we at least would need a different optimisation algorithm than FISTA, such as ADMM. Unfortunately, that would be a substantial effort to implement and test, so I don't think I have the time to implement that.