Duplicate class in replay_buffer.py

[jimmydengpeng]

There are two classes with same name ReplayBufferList within file elegantrl / train / replay_buffer.py in line 275 and 309.

They contain same named methods, but slightly differ in contents. However, the latter one will be used in runtime.

Which one is correct or expected?

[shixun404]

@jimmydengpeng Thanks for your reminder! The duplicated class has been fixed in Pull Request #219. Please let us know if you have any feedback or suggestions :)