CODEWITHSUNDEEP
cplexpyomo
algor207
algor207

Reputation: 131

How to warm-start pyomo with cplex?

I am currently using cplex with pyomo from the command line using

pyomo -solver=cplex model.py data.dat

the results are saved in the file results.json. How can I start cplex again using the previous results as a starting solution?

Upvotes: 3

Views: 1470

Answers (1)

Gabe Hackebeil
Gabe Hackebeil

Reputation: 1436

If you want to do more advanced things like loading a warmstart it is better to start using Pyomo by writing your own Python scripts. In your case, this might look like:

from pyomo.environ import *

# import the module that contains your model
import model

# load the data
instance = model.model.create_instance('data.dat')

# create a solver
cplex = SolverFactory("cplex")

# solve the first time (tee=True prints the cplex output)
status = cplex.solve(instance, tee=True)
assert str(status.solver.termination_condition) == 'optimal'

# solve the model a second time and create a warmstart file for cplex
status = cplex.solve(instance, warmstart=True, tee=True)

See the scripting section of the online Pyomo docs for more on this.

Upvotes: 4

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