Don't use hot starting with SYMPHONY for now

Author: tkralphs

src/MibSBilevel.cpp

@@ -362,12 +362,12 @@ MibSBilevel::checkBilevelFeasibility(bool isRoot)
 	    if (warmStartLL){
                sym_set_int_param(env, "keep_warm_start", TRUE);
                sym_set_int_param(env, "should_use_rel_br", FALSE);
-               sym_set_int_param(env, "use_hot_starts", FALSE);
                sym_set_int_param(env, "should_warmstart_node", TRUE);
                sym_set_int_param(env, "sensitivity_analysis", TRUE);
                sym_set_int_param(env, "sensitivity_bounds", TRUE);
                sym_set_int_param(env, "set_obj_upper_lim", FALSE);
 	    }
+            sym_set_int_param(env, "use_hot_starts", FALSE);
 	    sym_set_dbl_param(env, "time_limit", remainingTime);
 	    sym_set_int_param(env, "do_primal_heuristic", FALSE);
 	    sym_set_int_param(env, "verbosity", -2);
@@ -580,7 +580,7 @@ MibSBilevel::checkBilevelFeasibility(bool isRoot)
 		    // (lSolver)->setSymParam("prep_level", -1);
 		    sym_environment *env = dynamic_cast<OsiSymSolverInterface *>
 			(UBSolver)->getSymphonyEnvironment();
-		    //Always uncomment for debugging!!
+                    sym_set_int_param(env, "use_hot_starts", FALSE);
 		    sym_set_dbl_param(env, "time_limit", remainingTime);
 		    sym_set_int_param(env, "do_primal_heuristic", FALSE);
 		    sym_set_int_param(env, "verbosity", -2);

src/MibSCutGenerator.cpp

@@ -1022,6 +1022,7 @@ MibSCutGenerator::findLowerLevelSolImprovingSolutionIC(double *uselessIneqs,
 #if COIN_HAS_SYMPHONY
 	    sym_environment *env = dynamic_cast<OsiSymSolverInterface *>
 		(nSolver)->getSymphonyEnvironment();
+            sym_set_int_param(env, "use_hot_starts", FALSE);
 	    sym_set_dbl_param(env, "time_limit", remainingTime);
 	    sym_set_int_param(env, "do_primal_heuristic", FALSE);
             sym_set_int_param(env, "verbosity", -2);
@@ -1733,7 +1734,7 @@ MibSCutGenerator::storeBestSolHypercubeIC(const double* lpSol, double optLowerOb
 
 	    sym_environment *env = dynamic_cast<OsiSymSolverInterface *>
 		(UBSolver)->getSymphonyEnvironment();
-	    //Always uncomment for debugging!!
+            sym_set_int_param(env, "use_hot_starts", FALSE);
 	    sym_set_dbl_param(env, "time_limit", remainingTime);
 	    sym_set_int_param(env, "do_primal_heuristic", FALSE);
 	    sym_set_int_param(env, "verbosity", -2);
@@ -3118,6 +3119,7 @@ MibSCutGenerator::solveMips(OsiSolverInterface * mipSolver)
 #if COIN_HAS_SYMPHONY
         sym_environment *env = dynamic_cast<OsiSymSolverInterface *>
 	  (mipSolver)->getSymphonyEnvironment();
+        sym_set_int_param(env, "use_hot_starts", FALSE);
 	sym_set_dbl_param(env, "time_limit", remainingTime);
 	sym_set_int_param(env, "do_primal_heuristic", FALSE);
 	sym_set_int_param(env, "verbosity", -2);