Positivity constraints on fitted coefficients?

[tomwenseleers]

In glmnet one can add positivity constraints on the fitted coefficients using argument lower.limits. I was just wondering if it would be possible to add this capability in cudaglmnet also? (Support for additional families like poisson, multinomial and mgaussian would also be nice of course)

[victorz-ca]

The capacity of setting box-constraints on coefficients is one of the reasons I come back to glmnet. Elastic net in h2o or mpath do not have box-constraint capability.