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MohamedLaghdafHABIBOULLAHMaxenceGollierd1Lab
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Co-authored-by: Maxence Gollier <134112149+MaxenceGollier@users.noreply.github.com> Co-authored-by: YD1 <77547975+d1Lab@users.noreply.github.com>
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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:
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\begin{equation}\label{eq:nlp}
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\underset{x \in \mathbb{R}^n}{\text{minimize}} \quad f(x) + h(x),
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\end{equation}
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- **Trust-region methods (TR, TRDH)** [@aravkin-baraldi-orban-2022] and [@leconte-orban-2023],
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- **Quadratic regularization methods (R2, R2N)** [@diouane-habiboullah-orban-2024] and [@aravkin-baraldi-orban-2022],
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- **Levenbergh-Marquardt methods (LM, LMTR)** [@aravkin-baraldi-orban-2024].
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- **Levenberg-Marquardt methods (LM, LMTR)** [@aravkin-baraldi-orban-2024].
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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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# References

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