pyomo-ripopt 0.8.0

Pyomo solver plugin for the ripopt NLP solver

pyomo-ripopt

Pyomo solver plugin for ripopt, a fast interior-point NLP solver written in Rust.

Installation

pip install pyomo-ripopt

This installs the solver plugin and a bundled ripopt binary. No Rust toolchain needed.

Usage

import pyomo_ripopt  # registers the solver
from pyomo.environ import *

model = ConcreteModel()
model.x = Var(initialize=0.5)
model.obj = Objective(expr=(model.x - 2)**2)

solver = SolverFactory('ripopt')
result = solver.solve(model, tee=True)
print(f"x* = {value(model.x)}")  # 2.0

Solver Options

Pass options the same way as Ipopt:

solver = SolverFactory('ripopt')
solver.options['max_iter'] = 1000
solver.options['tol'] = 1e-10
solver.options['print_level'] = 5

Building from Source

If a pre-built wheel is not available for your platform:

cargo install ripopt   # installs the ripopt binary
pip install pyomo-ripopt --no-binary :all:

The solver will find the ripopt binary on your PATH.

License

EPL-2.0, same as ripopt.