fix save step bug

Author: vslyu

core/trainers/framework/runner.py

@@ -209,14 +209,14 @@ def _executor_dataloader_train(self, model_dict, context):
 
                     if save_step_interval >= 1 and batch_id % save_step_interval == 0 and context[
                             "is_infer"] == False:
-                        if context["fleet_mode"]:
-                            if context["fleet_mode"].upper() == "PS":
-                                train_prog = context["model"][model_dict[
-                                    "name"]]["main_program"]
-                        elif not context["is_fleet"] or context[
-                                "fleet_mode"].upper() == "COLLECTIVE":
+                        if context["fleet_mode"].upper() == "PS":
+                            train_prog = context["model"][model_dict["name"]][
+                                "main_program"]
+                            print("condition 1")
+                        else:
                             train_prog = context["model"][model_dict["name"]][
                                 "default_main_program"]
+                            print("condition 2")
                         startup_prog = context["model"][model_dict["name"]][
                             "startup_program"]
                         with fluid.program_guard(train_prog, startup_prog):