There has been several requests for group lasso regularised Poisson regression. This was more difficult than first thought as the gradient of the Poisson loss is not globally Lipschitz.
The loss gradient is, however, locally Lipschitz. A line-search for the Lipschtiz constant can therefore converge (and will under some reasonable assumptions). It is unclear if the restarting scheme will work with a line-search so that need to be investigated further.
Unfortunately, the code is currently structured so that major refactoring is needed to support a line-search for the Lipschitz.
There has been several requests for group lasso regularised Poisson regression. This was more difficult than first thought as the gradient of the Poisson loss is not globally Lipschitz.
The loss gradient is, however, locally Lipschitz. A line-search for the Lipschtiz constant can therefore converge (and will under some reasonable assumptions). It is unclear if the restarting scheme will work with a line-search so that need to be investigated further.
Unfortunately, the code is currently structured so that major refactoring is needed to support a line-search for the Lipschitz.