Add distributed IMPALA. #9
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* Add a distributed version of IMPALA using LaunchPad. * In addition, a single-process implementaion is also included. The single-process implementation is derived from Acme, with additional features of supporting truncated episodes. This is tested to work on Minigrid environments, but we can easily try this on Atari games. We can add an example later.
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This adds both a single-process and distributed (multiprocessing) implementation of IMPALA. The distributed implementation is written with Launchpad https://github.com/deepmind/launchpad.