Impala implementation in new API stack

1. Severity of the issue: (select one)
X None: I’m just curious or want clarification.
Low: Annoying but doesn’t hinder my work.
Medium: Significantly affects my productivity but can find a workaround.
High: Completely blocks me.

2. Environment:

  • Ray version: 2.45
  • Python version: 3.11.10
  • OS: linux
  • Cloud/Infrastructure: N/A
  • Other libs/tools (if relevant):

3. What happened vs. what you expected:

  • Expected: That there would be a default RLModule for Impala like the other algorithms.
  • Actual: There is not.

I am coming back to Ray/Rllib after a long absence, I think I last was engaged just after 2.0… I have old code base of Custom Model_V2 that I used w/ Impala, and in reading through the docs it would seem I would now have to write a Custom RLModule.. but I see in the algorithms/impala there is no default RLModule, only a Policy and Learner, where the other Algorithms have a RLModule… can you help me out and explain why is that the case?