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# Summary
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[RegularizedOptimization.jl](https://github.com/JuliaSmoothOptimizers/RegularizedOptimization.jl) is a Julia [@bezanson-edelman-karpinski-shah-2017] package that implements a family of regularization and trust-region type algorithms for solving nonsmooth optimization problems of the form:
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[RegularizedOptimization.jl](https://github.com/JuliaSmoothOptimizers/RegularizedOptimization.jl) is a Julia [@bezanson-edelman-karpinski-shah-2017] package that implements a family of quadratic regularization and trust-region type algorithms for solving nonsmooth optimization problems of the form:
These methods rely solely on the gradient and Hessian(-vector) information of the smooth part $f$ and the proximal mapping of the nonsmooth part $h$ in order to compute steps.
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Then, the objective function $f + h$ is used only to accept or reject trial points.
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Moreover, they can handle cases where Hessian approximations are unbounded[@diouane-habiboullah-orban-2024] and [@leconte-orban-2023-2], making the package particularly suited for large-scale, ill-conditioned, and nonsmooth problems.
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Moreover, they can handle cases where Hessian approximations are unbounded[@diouane-habiboullah-orban-2024] and [@leconte-orban-2023-2], making the package particularly suited for large-scale, ill-conditioned, and nonsmooth problems.
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# Statement of need
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## Application studies
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The package can be applied to the exact penality work by[@diouane-gollier-orban-2024]that addresses a problem where the model of the nonsmooth part is different from the function $h$.
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The package is used in the exact penalty work of[@diouane-gollier-orban-2024]to solve a problem where the model of the nonsmooth part differs from the function $h$.
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This is not covered in the current version of the competitive package [ProximalAlgorithms.jl](https://github.com/JuliaFirstOrder/ProximalAlgorithms.jl).
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## Support for inexact subproblem solves
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# Acknowledgements
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Mohamed Laghdaf Habiboullah is supported by an excellence FRQNT grant,
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and Youssef Diouane and Dominique Orban are partially supported by an NSERC Discovery Grant.
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Mohamed Laghdaf Habiboullah is supported by an excellence FRQNT grant.
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Youssef Diouane and Dominique Orban are partially supported by an NSERC Discovery Grant.
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