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+Standard implementation of the DDPG algorithm with (300,400) hidden units for both the actor and critic networks. 
+https://arxiv.org/abs/1509.02971  
+FILES:
+actor_network.py: The code for structure of the actor network  
+critic_network.py: The code for structure of the critic network  
+ou_noise.py:The random noise generator    
+ddpg.py:The code for the ddpg algorithm    
+gym_ddpg.py:Running ddpg on the environment