[rllib] What do the values mean in result.json and progress.csv?

[G-JOEY]

Through multiagent reinforcement learning using the PPO algorithm, result.json, progress.csv, etc. were created in the /ray_results folder.

Q1. I want to know the meaning of each value (e.g. episode_reward, episode_lengths). Where can I find out? I looked through the ray docs and py files and I didn't find anything.

Q2. A similar question, is it possible to modify values such as episode_lengths? In my reinforcement learning, episode_lengths is 20. Where is this set? (My guess is that it seems to be a preset value, and there is a high probability that it was set in another py file)