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30 lines
683 B
Python
30 lines
683 B
Python
from gym import RewardWrapper
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class TransformReward(RewardWrapper):
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r"""Transform the reward via an arbitrary function.
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Example::
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>>> import gym
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>>> env = gym.make('CartPole-v1')
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>>> env = TransformReward(env, lambda r: 0.01*r)
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>>> env.reset()
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>>> observation, reward, done, info = env.step(env.action_space.sample())
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>>> reward
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0.01
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Args:
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env (Env): environment
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f (callable): a function that transforms the reward
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"""
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def __init__(self, env, f):
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super().__init__(env)
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assert callable(f)
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self.f = f
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def reward(self, reward):
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return self.f(reward)
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