Create a dataset using an agent (#306)

Generate a dataset using an agent (allowing to select between this and a random dataset)

rl_coach/memories/episodic/episodic_experience_replay.py

@@ -452,8 +452,6 @@ class EpisodicExperienceReplay(Memory):
         progress_bar.update(len(episode_ids))
         progress_bar.close()
 
-        self.shuffle_episodes()
-
     def freeze(self):
         """
         Freezing the replay buffer does not allow any new transitions to be added to the memory.