EVENTS LIST

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19 July 2026
  • XLVI Dynamics Days Europe 2026 (DDE 2026)

    19 July 2026

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20 July 2026
  • Optimization 2026

    20 July 2026 - 22 July 2026 - 

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21 July 2026
  • Optimization 2026

    20 July 2026 - 22 July 2026 - 

    More information is available here.

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22 July 2026
  • Optimization 2026

    20 July 2026 - 22 July 2026 - 

    More information is available here.

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23 July 2026
  • [SOR] Subspace Modeling and Random Subspace Trust-region Methods in Derivative-free Optimization | Yiwen Chen (University of British Columbia)

    23 July 2026 - 14:30 - 15:30
    FCT NOVA, sala 232, edf.II

    Abstract:

    Derivative-freeoptimization (DFO) is essential for problems where derivatives are unavailableor expensive to compute, but its scalability is limited by the high cost ofmodel construction in large dimensions. Subspace techniques address thischallenge by building models and performing optimization in low-dimensionalaffine subspaces.  This talk presents aunified view of subspace modelling and methods for DFO.  We first establish theoretical connectionsbetween full-space and subspace linear and quadratic models and simplexderivatives, showing that they coincide on the underlying subspace and alongorthogonal directions.  We then presentrandom subspace trust-region methods that leverage these models, includingframeworks with provable convergence and complexity guarantees forunconstrained and convex-constrained problems.

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