added parameter to control display of solver's progress on the screen

Author: Ehsan Khodabandeh

optimization_model_pulp.py

@@ -104,7 +104,8 @@ def optimize(self):
         logger.info('Optimization starts!')
         _solver = pulp.PULP_CBC_CMD(keepFiles=model_params['write_log'],
                                     fracGap=model_params['mip_gap'],
-                                    maxSeconds=model_params['time_limit'])
+                                    maxSeconds=model_params['time_limit'],
+                                    msg=model_params['display_log'])
 
         if model_params['solver'] == 'gurobi':
             _solver = pulp.GUROBI(msg=model_params['write_log'],
@@ -116,7 +117,8 @@ def optimize(self):
                 set_mip_gap = "set mip tolerances mipgap {}".format(model_params['mip_gap'])
                 options.append(set_mip_gap)
             _solver = pulp.CPLEX_CMD(keepFiles=model_params['write_log'],
-                                     options=options, timelimit=model_params['time_limit'])
+                                     options=options, timelimit=model_params['time_limit'],
+                                     msg=model_params['display_log'])
         elif model_params['solver'] == 'glpk':
             # Read more about glpk options: https://en.wikibooks.org/wiki/GLPK/Using_GLPSOL
             options = []
@@ -126,7 +128,8 @@ def optimize(self):
             if model_params['time_limit']:
                 set_time_limit = "--tmlim {}".format(model_params['time_limit'])
                 options.append(set_time_limit)
-            _solver = pulp.GLPK_CMD(keepFiles=model_params['write_log'], options=options)
+            _solver = pulp.GLPK_CMD(keepFiles=model_params['write_log'], options=options,
+                                    msg=model_params['display_log'])
 
         self.model.solve(solver=_solver)
 

parameters.py

@@ -5,7 +5,8 @@
     'solver': None,  # default is None for 'cbc'; can also be 'gurobi', 'cplex', 'glpk'
     'module': None,  # default is None for pulp; 'gurobi' for using gurobi
     'write_lp': True,  # whether to write the model .lp file
-    'write_log': False,  # whether to write the output .log file
+    'write_log': False,  # whether to keep the output files such as .sol or .mps (or .log for cplex or gurobi)
+    'display_log': False,  # displays information from the solver to stdout
     'mip_gap': None,  # default is None to use the solver's default value. Can be any float less than 1.0
     'time_limit': None,  # in seconds
 }