Installing PyIpopt

1

Dear,

I’m trying to install PyIpopt to run Ipopt’s dependencies within Dolfin Adjoint. I’m using Mac Os.

After everything is installed, and using a Jupyter Notebook, I try to test the file hs071.py on the page https://github.com/xuy/pyipopt/tree/master/examples.

I import the modules below separately and everything works:

import pyipopt
from numpy import *

Then when I run the rest of the code in another cell, the following error appears:

File “/Users/userxyz/my-project/hs071.py”, line 90, in
nlp = pyipopt.create (nvar, x_L, x_U, ncon, g_L, g_U, nnzj, nnzh, eval_f, eval_grad_f, eval_g, eval_jac_g)

AttributeError: module ‘pyipopt’ has no attribute ‘create’

Can anybody help me?

2

Dolfin-adjoint does no longer use pyipopt, it uses IPOPT from pypi. Please consider switching to this dependency, see: https://github.com/matthias-k/cyipopt

3

Dear Docker,

Thank you very much for your return.

However, when I use some code that uses the IPOPTSolver function, that function calls code from the pyadjoint / optimization / ipopt_solver.py folder and generates the following error:

File “/Users/userxyz/opt/anaconda3/envs/fenicsproject/lib/python3.8/site-packages/pyadjoint/optimization/ipopt_solver.py”, line 27, in __build_pyipopt_problem
import pyipopt
ModuleNotFoundError: No module named ‘pyipopt’

How to change to cyipopt?

4

You are using an outdated version of pyadjoint. The current version uses another version (introduced in this commit, as can be seen in the master branch files

5

Dear Dokken,

Thank you! Everything worked!