运行后self.build_program()报错

[lzlbit123]

按照课上讲的代码policy gradient 运行后报错raise NotImplementedError

Traceback (most recent call last): File "C:\Users\lzlbi\PycharmProjects\PPO\train.py", line 86, in main() File "C:\Users\lzlbi\PycharmProjects\PPO\train.py", line 63, in main agent = Agent(alg, obs_dim=obs_dim, act_dim=act_dim) File "C:\Users\lzlbi\PycharmProjects\PPO\agent.py", line 11, in __init__ super(Agent, self).__init__(algorithm) File "D:\anaconda\envs\paddle\lib\site-packages\parl\core\fluid\agent.py", line 81, in __init__ self.build_program() File "C:\Users\lzlbi\PycharmProjects\PPO\agent.py", line 20, in build_program self.act_prob = self.alg.predict(obs) File "D:\anaconda\envs\paddle\lib\site-packages\parl\core\fluid\algorithm.py", line 196, in predict raise NotImplementedError NotImplementedError 版本：parl==1.4 paddle paddle==1.8.5 gym==0.18.0 Python ==3.7.7

[lzlbit123]

另外，课程中的代码是否需要定义是否启用GPU运算？