<div dir="ltr">Dear,<div><br></div><div style>I'm trying to solve a non-linear problem. Unfortunately, the heuristics we developed to solve the problem have difficulties finding good solutions. Therefore we were considering to use a ipopt as an additional optimization phase. As a first test, we did the following:</div>
<div style><br></div><div style>1. Solve the problem heuristically, with a time limit.</div><div style>2. Feed the resulting solution to Ipopt, and let is solve.</div><div style><br></div><div style>So far, Ipopt only produces mediocre results which are not competitive with the heuristic: letting the heuristic run for a larger amount of time usually produces better results. Apparently, ipopt gets stuck at a local optimum. How can I get ipopt out of the local optimum? Should I restart it with a different initial solution, or are there better approaches? I currently only have experience with linear solvers; not with non-linear solvers.</div>
<div style><br></div><div style>br,</div><div style><br></div><div style>Joris</div></div>