i guess it's just a bug in how the solvers return residuals, I'll add
some unit tests with manually-computed residuals to check.

On Wed, Oct 30, 2013 at 9:48 AM, Olivier Grisel
<olivier.gri...@ensta.org> wrote:
> Does anyone have a explanation for the discrepancy in the residuals
> for the lbfgs-b and nnls_kkt? If nnls_kkt can stay so close to zero,
> unregularized lbfgs-b should reach be able to reach the same training
> set MSE, no?
>
> --
> Olivier
>
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