本文解决了一个关于gym环境的错误，即'BipedalWalker-v2'未注册的问题。通过更新gym到最新版本，并使用推荐的'BipedalWalker-v3'环境，问题得以解决。
gym环境错误：gym.error.UnregisteredEnv: No registered env with id: BipedalWalker-v2
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "TD3_BipedalWalker-v2.py", line 54, in <module>
env = gym.make(args.env_name)
File "/home/B318_ssh/.local/lib/python3.6/site-packages/gym/envs/registration.py", line 75, in make
spec = self.spec(id)
File "/home/B318_ssh/.local/lib/python3.6/site-packages/gym/envs/registration.py", line 89, in spec
raise error.UnregisteredEnv('No registered env with id: {}'.format(id))
gym.error.UnregisteredEnv: No registered env with id: BipedalWalker-v2
因为gym的版本的问题，安装上最新的gym，使用它推荐的“BipedalWalker-v3”就可以了。
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