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tune_c.c
/* Copyright 2019, Gurobi Optimization, LLC */ /* This example reads a model from a file and tunes it. It then writes the best parameter settings to a file and solves the model using these parameters. */ #include <stdlib.h> #include <stdio.h> #include <math.h> #include "gurobi_c.h" int main(int argc, char *argv[]) { GRBenv *env = NULL; GRBmodel *model = NULL; int tuneresultcount; int error = 0; if (argc < 2) { fprintf(stderr, "Usage: tune_c filename\n"); exit(1); } /* Create environment */ error = GRBloadenv(&env, "tune_c.log"); if (error) goto QUIT; /* Read model from file */ error = GRBreadmodel(env, argv[1], &model); if (error) goto QUIT; /* Set the TuneResults parameter to 1 */ error = GRBsetintparam(GRBgetenv(model), GRB_INT_PAR_TUNERESULTS, 1); if (error) goto QUIT; /* Tune the model */ error = GRBtunemodel(model); if (error) goto QUIT; /* Get the number of tuning results */ error = GRBgetintattr(model, GRB_INT_ATTR_TUNE_RESULTCOUNT, &tuneresultcount); if (error) goto QUIT; if (tuneresultcount > 0) { /* Load the best tuned parameters into the model's environment */ error = GRBgettuneresult(model, 0); if (error) goto QUIT; /* Write tuned parameters to a file */ error = GRBwrite(model, "tune.prm"); if (error) goto QUIT; /* Solve the model using the tuned parameters */ error = GRBoptimize(model); if (error) goto QUIT; } QUIT: /* Error reporting */ if (error) { printf("ERROR: %s\n", GRBgeterrormsg(env)); exit(1); } /* Free model */ GRBfreemodel(model); /* Free environment */ GRBfreeenv(env); return 0; }