> By the way, the MiniBatchDictLearning can be trivially modified to do
> this: do a non-negative Lasso, instead of a Lasso. This is discussed in
> the original paper.

if somebody has some time to add a positive option to LassoLars like
available in Lasso that would be great. It would then be straighforward
to add such a positive option in MiniBatchDictLearning.

FYI here is a gist that should be a good start

https://gist.github.com/agramfort/7228966

Alex

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