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World Model as a Graph

This is the code accompanying the paper: World Model as a Graph: Learning Latent Landmarks for Planning (ICML 2021 Long Presentation).

By Lunjun Zhang, Ge Yang, Bradly Stadie.

A link to our paper can be found on arXiv.

Videos / blog can be found on our website.

Overview

Model-based RL agents today plan using step-by-step virtual rollouts in a learned dynamics model. This type of world model quickly diverges from reality as the planning horizon increases. Humans, however, can do planning by analyzing the structure of a problem in the large and decomposing it into simpler sub-problems. How can we teach learning agents to do something similar?

We enhance RL agents’ ability to do temporally extended reasoning by learning a graph-structured world model composed of sparse, multi-step transitions. We show how to learn both the nodes and the edges on the graph together with a goal-conditioned policy, and how to better leverage temporal abstraction in online planning.

Instructions

Requirements:

python==3.7.4
numpy==1.19.5
torch==1.5.1+cu101
tensorflow==1.13.1
gym==0.13.1
mpi4py==3.0.3
mujoco_py==2.0.2.13
pandas==1.1.1

The implementation of <img src="https://latex.codecogs.com/gif.latex?L^{3}P " /> is provided in the rl folder.

The training scripts are provided in scripts folder.

Citations

Please cite our paper as:

@inproceedings{zhang2021worldmodel,
  title={World model as a graph: Learning latent landmarks for planning},
  author={Zhang, Lunjun and Yang, Ge and Stadie, Bradly C},
  booktitle={International Conference on Machine Learning},
  pages={12611--12620},
  year={2021},
  organization={PMLR}
}