on reward number two and obtained policy number two and so on so you do this for all these rewards individually okay so you give the agent a new task and you ask it to learn a policy for that task now you're in a situation where if you are have a new task so are new the question is do you again need to train a new policy and the answer for this paper is no because we have all these policies we don't need to train a new we can simply mix and match these policies that we already know to obtain a good solution for the new