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VoxPoser: Composable 3D Value Maps for Robotic Manipulation with Language Models

[Project Page] [Paper] [Video]

Wenlong Huang¹, Chen Wang¹, Ruohan Zhang¹, Yunzhu Li^1,2, Jiajun Wu¹, Li Fei-Fei¹

¹Stanford University, ²University of Illinois Urbana-Champaign

This is the official demo code for VoxPoser, a method that uses large language models and vision-language models to zero-shot synthesize trajectories for manipulation tasks.

In this repo, we provide the implementation of VoxPoser in RLBench as its task diversity best resembles our real-world setup. Note that VoxPoser is a zero-shot method that does not require any training data. Therefore, the main purpose of this repo is to provide a demo implementation rather than an evaluation benchmark.

If you find this work useful in your research, please cite using the following BibTeX:

@article{huang2023voxposer,
      title={VoxPoser: Composable 3D Value Maps for Robotic Manipulation with Language Models},
      author={Huang, Wenlong and Wang, Chen and Zhang, Ruohan and Li, Yunzhu and Wu, Jiajun and Fei-Fei, Li},
      journal={arXiv preprint arXiv:2307.05973},
      year={2023}
    }

Setup Instructions

Note that this codebase is best run with a display. For running in headless mode, refer to the instructions in RLBench.

• Create a conda environment:

conda create -n voxposer-env python=3.9
conda activate voxposer-env

• See Instructions to install PyRep and RLBench (Note: install these inside the created conda environment).

• Install other dependencies:

pip install -r requirements.txt

• Obtain an OpenAI API key, and put it inside the first cell of the demo notebook.

Running Demo

Demo code is at src/playground.ipynb. Instructions can be found in the notebook.

Code Structure

Core to VoxPoser:

• playground.ipynb: Playground for VoxPoser.
• LMP.py: Implementation of Language Model Programs (LMPs) that recursively generates code to decompose instructions and compose value maps for each sub-task.
• interfaces.py: Interface that provides necessary APIs for language models (i.e., LMPs) to operate in voxel space and to invoke motion planner.
• planners.py: Implementation of a greedy planner that plans a trajectory (represented as a series of waypoints) for an entity/movable given a value map.
• controllers.py: Given a waypoint for an entity/movable, the controller applies (a series of) robot actions to achieve the waypoint.
• dynamics_models.py: Environment dynamics model for the case where entity/movable is an object or object part. This is used in controllers.py to perform MPC.
• prompts/rlbench: Prompts used by the different Language Model Programs (LMPs) in VoxPoser.

Environment and utilities:

• envs:
  • rlbench_env.py: Wrapper of RLBench env to expose useful functions for VoxPoser.
  • task_object_names.json: Mapping of object names exposed to VoxPoser and their corresponding scene object names for each individual task.
• configs/rlbench_config.yaml: Config file for all the involved modules in RLBench environment.
• arguments.py: Argument parser for the config file.
• LLM_cache.py: Caching of language model outputs that writes to disk to save cost and time.
• utils.py: Utility functions.
• visualizers.py: A Plotly-based visualizer for value maps and planned trajectories.

Acknowledgments

• Environment is based on RLBench.
• Implementation of Language Model Programs (LMPs) is based on Code as Policies.
• Some code snippets are from Where2Act.
• Additional acknowledgement to GitHub Copilot and GPT-4 for collaboratively writing a significant portion of the code in this codebase.