Artelys Knitro 11.1: Solve derivative free problems faster than ever!
Use-case: See how derivative-free optimization is used in Macro-economics!
Among the domain of macroeconomics are a series of models called DGSE (Dynamic Stochastic General Equilibrium), that try to explain the effects of economic policies on economic growth. Such models are frequently used by Central Banks to predict global growth of a country.
We studied the Federal Reserve Bank of New York DSGE model implemented in MATLAB using the IRIS toolbox by Iskander Karibzhanov, Senior Scientist at Bank of Canada. This model is highly nonlinear, with no access to exact derivatives. In such cases, one cannot expect the solver to find a solution with as much precision as for a problem for which exact derivatives are provided.
The parallel finite-differencing feature of Artelys Knitro is used to speed up the computation. Using Knitro 11.1 out-of-the-box, the computation time is further decreased by a factor of 5 while achieving the same value of objective value.
A new warm-start option for interior point methods
This version also brings a new option dedicated to warm-start for the two interior point methods embedded in Artelys Knitro (algorithm 1&2). This option allows huge performance improvements when the user is able to provide a good starting point. In addition, models that require solving multiple nonlinear problems sequentially specifically benefit from this new warm-start option. The figure below illustrates a typical application of this new option to solve sequential nonlinear subproblems, the overall computation time is reduced by a factor 10!
Additional features of Artelys Knitro 11.1
• New Python API with dedicated methods to define structured expressions
• Automatic convexity detection for QP/QCQPs
• Improved Knapsack cut generation including lifted cuts for MINLP problems
• Enhancement of the L-BFGS Hessian approximation
• General performance improvement on convex problems in particular for very large instances
Artelys has developed an energy planning tool for Le Havre Seine Métropole
— As part of Le Havre Seine Métropole’s energy master plan, Artelys has worked with metropolitan services to set up a web platform for monitoring territorial energy data.
The latest versions of Artelys Knitro and CasADi are now compatible!
— CasADi is an open-source tool for general numerical optimization with a strong focus on optimal control and its versions 3.6.2 and higher are now compatible with Artelys Knitro 13.2.
Artelys participation to studies assessing potential contribution of African H2 to EU decarbonization objectives
— As part of the Clean Hydrogen Partnership funding programme, Artelys will participate in the JUST-GREEN AFRH2ICA project along with ten other African and European partners ready to share their know-how on hydrogen economics and technologies.
Artelys perform smart grid cost-benefit analysis with open-source PowSyBl-Metrix
Artelys demonstrated how to perform cost-benefit analysis of new transmission assets in a smart grid during a webinar hosted by the Linux Foundation Energy and the Global Power System Transformation Consortium showing the strength of the prominent open-source grid computation tool PowSyBl-Metrix.
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