<s> try : <EOL> from matplotlib . mlab import rk4 <EOL> except ImportError : <EOL> raise ImportError ( '<STR_LIT>' ) <EOL> from pybrain . rl . environments . cartpole . cartpole import CartPoleEnvironment , CartPoleLinEnvironment <EOL> from pybrain . rl . environments . cartpole . renderer import CartPoleRenderer <EOL> from pybrain . rl . environments . cartpole . balancetask import BalanceTask , EasyBalanceTask , DiscreteBalanceTask , DiscreteNoHelpTask , JustBalanceTask , LinearizedBalanceTask , DiscretePOMDPTask <EOL> from pybrain . rl . environments . cartpole . doublepole import DoublePoleEnvironment <EOL> from pybrain . rl . environments . cartpole . nonmarkovpole import NonMarkovPoleEnvironment <EOL> from pybrain . rl . environments . cartpole . nonmarkovdoublepole import NonMarkovDoublePoleEnvironment </s>
