ERROR: Solver (ipopt) returned non-zero return code (1)
JieZhu6 opened this issue · 1 comments
JieZhu6 commented
I'm getting an error while using ipopt to solve a model that contains constraints on the tanh function. The error log is as follows:
ERROR: Solver (ipopt) returned non-zero return code (1)
ERROR: Solver log: Ipopt 3.14.12:
**************************************************************************
**** This program contains Ipopt, a library for large-scale nonlinear
optimization.
Ipopt is released as open source code under the Eclipse Public License
(EPL).
For more information visit https://github.com/coin-or/Ipopt
**************************************************************************
****
This is Ipopt version 3.14.12, running with linear solver MUMPS 5.5.1.
Number of nonzeros in equality constraint Jacobian...: 0 Number of
nonzeros in inequality constraint Jacobian.: 3249 Number of nonzeros
in Lagrangian Hessian.............: 745
Error evaluating "var =" definition -1: can't evaluate tanh'(1152.63).
I don't know what the problem is that's causing this