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<p class="MsoNormal"><span style="font-size:11.0pt;color:black">============================<o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;color:black"> Gravity</span></b><span style="font-size:11.0pt;color:black"> is joining COIN-OR<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">============================<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">We are pleased to announce that Gravity (<a href="https://projects.coin-or.org/Gravity">https://projects.coin-or.org/Gravity</a>) is now part of COIN-OR!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">Gravity is a scalable, memory efficient modeling language for solving mathematical models in Optimization and Machine Learning. It exploits structure to reduce function evaluation time including
Jacobian and Hessian computation. Gravity is implemented in C++ with a flexible interface allowing the user to specify the numerical accuracy of variables and parameters and can handle arbitrary Mixed-Integer Nonlinear Programs (MINLPs) as well as Mixed-Integer
Semidefinite Programs (MISDPs). It is also designed to offer efficient iterative model solving, convexity detection, multithreading of subproblems, automatic reformulation of disjuctive constraints, automatic building of convex relaxations and lazy constraint
generation. When compared to state-of-the-art modeling languages such as JuMP, Gravity is 5 times faster in terms of function evaluation and up to 60 times more memory efficient. Short term goals include Lasserre’s hierarchy implementation for polynomial optimization
and automatic symbolic variable elimination for MINLPs.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">Please let us know if you have any questions or feedback!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">Kind regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">______________________________<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">Hassan Hijazi<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">Scientist<o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;color:black">Los Alamos National Laboratory</span></b><span style="font-size:11.0pt;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU" style="font-size:11.0pt;color:#767473">PO Box 1663, MS B284<br>
Los Alamos, NM 87545 </span><span lang="EN-AU" style="font-size:11.0pt;color:#5CA632">| </span><span lang="EN-AU" style="font-size:11.0pt;color:#767473">USA</span><span style="font-size:11.0pt;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU" style="font-size:11.0pt;color:#2FB787">E </span><span style="font-size:11.0pt;color:black"><a href="mailto:hlh@lanl.gov"><span style="color:blue">hlh@lanl.gov</span></a> </span><span lang="EN-AU" style="font-size:11.0pt;color:#2FB787">T</span><span lang="EN-AU" style="font-size:11.0pt;color:black"> (+1)
505-665-2001</span><span style="font-size:11.0pt;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#537688"><a href="http://about.me/hhijazi"><span style="color:blue">about.me/hhijazi</span></a></span><span style="font-size:11.0pt;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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