<div dir="ltr"><div><div>Dear all,<br><br></div>I am using IPOPT in order to solve a simple shape optimization problem in which I know what the optimal shape should be. Because it is hard to get an exact Hessian analytically, I am using L-BFGS instead. I notice that IPOPT converges to the optimal solution, but near the solution it tends to do a lot of line search which slows down tremendously. I cound increase the convergence tolerance a bit in order to terminate IPOPT in a reasonal time and with a good enough solution. <br>
<br></div><div>When BFGS-type algorithm is used, I expect to see that a unit step to be normally satisfied by whatever the linesearch criteria is used. However, I am not seeing that from IPOPT.<br><br></div><div>Any feedback on this issue is welcome.<br>
<br>Thanks.</div><div><div><div><div><br>-- <br>Jesus Loves you,<br>Young (Youngsoo).
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