Update train.py #2
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added python 2.x compatibility
added workaround for breakout and space invaders to correct the number of moves
Note: this workaround just tells the acting methods that the move space will be 4 instead of the default 6. So, the network will be making a prediction amongst 0,1,2,3 which corresponds to ['NOOP', 'FIRE', 'RIGHT', 'LEFT'] - thus, we ignore the RIGHTFIRE and LEFTFIRE which are not needed for breakout.