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Browsing by Subject "Gradient-only optimization"

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Gradient-only approaches to avoid spurious local minima in unconstrained optimization

Author: Wilke, DN ; Kok, S ; Snyman, JA ; Groenwold, AA Date: Jun 2013 We reflect on some theoretical aspects of gradient-only optimization for the unconstrained optimization of objective functions containing non-physical step or jump discontinuities. This kind of discontinuity arises when the optimization problem ... Read more
Numerical sensitivity computation for discontinuous gradient-only optimization problems using the complex-step method

Author: Wilke, DN ; Kok, S Date: Jul 2012 This study considers the numerical sensitivity calculation for discontinuous gradientonly optimization problems using the complex-step method. The complex-step method was initially introduced to differentiate analytical functions in the late ... Read more
Relaxed error control in shape optimization that utilizes remeshing

Author: Wilke, DN ; Kok, S ; Groenwold, AA Date: Feb 2013 Shape optimization strategies based on error indicators usually require strict error control for every computed design during the optimization run. The strict error control serves two purposes. Firstly, it allows for the accurate computation ... Read more

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Browsing by Subject "Gradient-only optimization"

Browsing by Subject "Gradient-only optimization"

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