Add Learning What to Defer algorithm for MIS problem example

[Jinyu-W]

Description

Contexts include:

• A simple MIS simulator, which simulates a complete MIS-solving process as a transition;
• Graph-based PPO algorithm implementation, including Policy, TranOps, Trainer, basic networks, and replay memory;
• An EnvSampler and necessary configuration files;
• A README of the brief introduction of this algorithm.

Linked issue(s)/Pull request(s)

• issue_number

Type of Change

• Non-breaking bug fix
• Breaking bug fix
• New feature
• Test
• Doc update
• Docker update

Related Component

• Simulation toolkit
• RL toolkit
• Distributed toolkit

Has Been Tested

• OS:
  • Windows
  • Mac OS
  • Linux
• Python version:
  • 3.7
  • 3.8
  • 3.9
• Key information snapshot(s):

Needs Follow Up Actions

• New release package
• New docker image

Checklist

• Add/update the related comments
• Add/update the related tests
• Add/update the related documentations
• Update the dependent downstream modules usage