Opossum—OPtimizatiOn Solver with SUrrogate Models
(by Thomas Wortmann)
Opossum includes two of the best-performing optimization algorithms in Grasshopper: model-based RBFOpt and evolutionary CMA-ES
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Opossum includes two of the best-performing optimization algorithms in Grasshopper: model-based RBFOpt and evolutionary CMA-ES. RBFOpt uses advanced machine learning techniques to find good solutions with a small number of function evaluations, i.e. simulations, while CMA-ES reliably finds near-optimal solutions when many function evaluations are possible. (Various papers with benchmark results are availabe here.)

Opossum's GUI is similar to Galapagos. Opossum has a results table, which makes it easy to revisit all optimization results by double-clicking entries in the table.

Opossum requires a free license key, which you can get here.

Opossum has been developed at the Advanced Architecture Lab with support from the SUTD-MIT International Design Centre.

Version History

Opossum 1.7.1        2019-May-27

  • Genepools for CMAES starting point.

Opossum 1.7.0        2019-April-28

  • Includes CMA-ES algorithm
  • Eliminates need for installer (just drop Opossum.gha and the "Solvers" folder into Libraries)
  • Updated to RBFOpt 4.1.1: New options, more efficient initialization phase

Opossum 1.5.0        2018-March-16

  • Thread-safe
  • Canvas lockscreen
  • Automatic "max_evaluation" setting

Opossum 1.4.3        2017-Sept-30

  • Ensured Invariant Culture

Opossum 1.4.2        2017-Sep-23

  • Bug Fix

Opossum 1.4.1        2017-Sep-17

  • Update to RBFOpt 3.0.1: faster performance with improved local search
  • Results tab allows examination of all optimization results

Opossum 1.2.3        2017-Jun-06

  • Fixed bug caused by very long PATH variable

Opossum 1.2.2        2017-Jun-12

  • Fixed license write-permission issue

Opossum 1.2.1        2017-Jun-12

  • Updated to RBFOpt 2.1: faster performance
  • Included example file
  • Small bugfixes

Opossum 1.1.3        2017-Jun-12

  • Opossum window always on top.

Opossum 1.1.2        2017-Jun-12

  • More compact libraries
  • Culture-independent license check

Opossum 1.1.1        2016-Oct-27

  • GUI Improvements
  • Installer Improvements
  • Bug Fixes
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