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custom.py
# # Copyright 2021, Gurobi Optimization, LLC # # Interactive shell customization example # # Define a set of customizations for the Gurobi shell. # Type 'from custom import *' to import them into your shell. # from gurobipy import * # custom read command -- change directory as appropriate def myread(name): return read('/home/jones/models/' + name) # Custom termination criterion: Quit optimization # - after 5s if a high quality (1% gap) solution has been found, or # - after 10s if a feasible solution has been found. def mycallback(model, where): if where == GRB.Callback.MIP: time = model.cbGet(GRB.Callback.RUNTIME) best = model.cbGet(GRB.Callback.MIP_OBJBST) bound = model.cbGet(GRB.Callback.MIP_OBJBND) if best < GRB.INFINITY: # We have a feasible solution if time > 5 and abs(bound - best) < 0.01 * abs(bound): model.terminate() if time > 10: model.terminate() # custom optimize() function that uses callback def myopt(model): model.optimize(mycallback) if __name__ == "__main__": # Use as customized command line tool import sys if len(sys.argv) != 2: print("Usage: python custom.py <model>") m = read(sys.argv[1]) myopt(m)