refine code

fluid/DeepQNetwork/DQN_agent.py

@@ -79,7 +79,6 @@ class DQNModel(object):
         policy_vars.sort(key=lambda x: x.name)
         target_vars.sort(key=lambda x: x.name)
         
-        self._sync_program = fluid.Program()
         with fluid.program_guard(self._sync_program):
             sync_ops = []
             for i, var in enumerate(policy_vars):

fluid/DeepQNetwork/DoubleDQN_agent.py

@@ -86,7 +86,6 @@ class DoubleDQNModel(object):
         policy_vars.sort(key=lambda x: x.name)
         target_vars.sort(key=lambda x: x.name)
         
-        self._sync_program = fluid.Program()
         with fluid.program_guard(self._sync_program):
             sync_ops = []
             for i, var in enumerate(policy_vars):

fluid/DeepQNetwork/DuelingDQN_agent.py

@@ -79,7 +79,6 @@ class DuelingDQNModel(object):
         policy_vars.sort(key=lambda x: x.name)
         target_vars.sort(key=lambda x: x.name)
         
-        self._sync_program = fluid.Program()
         with fluid.program_guard(self._sync_program):
             sync_ops = []
             for i, var in enumerate(policy_vars):