Setting ipopt tolerance when using SolverFactory()

[Bodhi Biswas]

Hello,

I'm new to Pyomo, so this may be a basic question! 

I am attempting (without success) to slacken the tolerance of the ipopt algorithm from the default 1e-08, to 1e-03.

Here the snippet I am using within my python script:

#------------------------------------------

solver='ipopt'

opt=SolverFactory(solver)

opt.tol = 1e-3        #Is this right???

results = opt.solve(disc_instance, tee=True)

#------------------------------------------

The solver keeps iterating despite meeting the new tolerance requirement.  I must not be using the correct syntax for specifying the tolerance requirement.

Any suggestions?

Thanks

[Gabriel Hackebeil]

You are close.

Solver options can be set in a number of ways. If you plan to use a solver plugin more than once and you want the options to persist, you can update the options dictionary directly on the solver plugin.

opt = SolverFactory(‘ipopt’)

opt.options[‘tol’] = 1e-3

results = opt.solve(instance)

If you want options that only last for a single solve invocation, you can pass them into the solve method via a dictionary with the options keyword.

opt = SolverFactory(‘ipopt’)

# use tol

results = opt.solve(instance, options={‘tol’: 1e-3})

# do not use tol

results = opt.solve(instance)

Gabe

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