x-magical
x-magical is a benchmark extension of MAGICAL specifically geared towards cross-embodiment imitation. The tasks still provide the Demo/Test structure that allows one to evaluate how well imitation or reward learning techniques can generalize the demonstrator's intent to substantially different deployment settings, but there's an added axis of variation focusing on how well these techniques can adapt to systematic embodiment gaps between the demonstrator and the learner. This is a challenging problem, as different embodiments are likely to use unique and suitable strategies that allow them to make progress on a task.
Embodiments in an x-magical task must still learn the same set of general skills like 2D perception and manipulation, but they are specifically designed such that they solve the task in different ways due to differences in their end-effector, shapes, dynamics, etc. For example, in the sweeping task, some agents can sweep all debris in one motion while others need to sweep them one at a time. These differences in execution speeds and state-action trajectories pose challenges for current LfD techniques, and the ability to generalize across embodiments is precisely what this benchmark evaluates.
x-magical is under active development - stay tuned for more tasks and embodiments!
Tasks, Embodiments and Variants
Each task in x-magical can be instantiated with a particular embodiment, which changes the nature of the robotic agent. Additionally, the task can be instantiated in a particular variant, which changes one or more semantic aspects the environment. Both axes of variation are meant to evaluate combinatorial generalization. We list the task-embodiment pairings below, with a picture of the initial state of the Demo variant:
| Task | Description |
|---|---|
    |
SweepToTop: The agent must sweep all three debris to the goal zone shaded in pink. Embodiments: Gripper, Shortstick, MediumStick, Longstick. Variants: all except Jitter. |
Here is a description (source) of what each variant modifies:
| Variant | Description |
|---|---|
| Demo | The default variant with no randomization, i.e. the same initial state across reset(). |
| Jitter | The rotations and orientations of all objects, and the size of goal regions, are jittered by up to 5% of the maximum range. |
| Layout | Positions and rotations of all objects are completely randomized. The definition of what constitutes an "object" is task-dependent, i.e. some tasks might not randomize the pose of the robotic agent, just the pushable shapes. |
| Color | The color of blocks and goal regions is randomized, subject to task-specific constraints. |
| Shape | The shape of pushable blocks is randomized, again subject to task-specific constraints. |
| Dynamics | The mass and friction of objects are randomized. |
| All | All applicable randomizations are applied. |
Usage
x-magical environments are available in the Gym registry and can be constructed via string specifiers that take on the form <task>-<embodiment>-<observation_space>-<view_mode>-<variant>-v0, where:
- task: The name of the desired task. See above for the full list of available tasks.
- embodiment: The embodiment to use for the robotic agent. See above for the list of supported embodiments per task.
- observation_space: Whether to use pixel or state-based observations. All environments support pixel observations but they may not necessarily provide state-based observation spaces.
- view_mode: Whether to use an allocentric or egocentric agent view.
- variant: The variant of the task to use. See above for the full list of variants.
For example, here's a short code snippet that illustrates this usage:
import gym
import xmagical
# This must be called before making any Gym envs.
xmagical.register_envs()
# List all available environments.
print(xmagical.ALL_REGISTERED_ENVS)
# Create a demo variant for the SweepToTop task with a gripper agent.
env = gym.make('SweepToTop-Gripper-Pixels-Allo-Demo-v0')
obs = env.reset()
print(obs.shape) # (384, 384, 3)
env.render(mode='human')
env.close()
# Now create a test variant of this task with a shortstick agent,
# an egocentric view and a state-based observation space.
env = gym.make('SweepToTop-Shortstick-State-Ego-TestLayout-v0')
init_obs = env.reset()
print(init_obs.shape) # (16,)
env.close()
Installation
x-magical requires Python 3.8 or higher. We recommend using an Anaconda environment for installation. You can create one with the following:
conda create -n xmagical python=3.8
conda activate xmagical
Installing PyPI release
pip install x-magical
Installing from source
Clone the repository and install in editable mode:
git clone https://github.com/kevinzakka/x-magical.git
cd x-magical
pip install -r requirements.txt
pip install -e .
Contributing
If you'd like to contribute to this project, you should install the extra development dependencies as follows:
pip install -e .[dev]
Acknowledgments
A big thank you to Sam Toyer, the developer of MAGICAL, for the valuable help and discussions he provided during the development of this benchmark. Please consider citing MAGICAL if you find this repository useful:
@inproceedings{toyer2020magical,
author = {Sam Toyer and Rohin Shah and Andrew Critch and Stuart Russell},
title = {The {MAGICAL} Benchmark for Robust Imitation},
booktitle = {Advances in Neural Information Processing Systems},
year = {2020}
}
Additionally, we'd like to thank Brent Yi for fruitful technical discussions and various debugging sessions.
25 Apr 28, 2022
3k Jan 9, 2023
82 Jan 1, 2023
11 Nov 17, 2022
14 Nov 18, 2022
8 Sep 14, 2022
14 Aug 30, 2022
![[CVPR 2022] PoseTriplet: Co-evolving 3D Human Pose Estimation, Imitation, and Hallucination under Self-supervision (Oral)](https://github.com/Garfield-kh/PoseTriplet/raw/main/assets/dual-loop-detail-v3.jpg)
256 Dec 28, 2022
1 Oct 24, 2021
422 Dec 30, 2022
71 Jan 04, 2023
128 Dec 25, 2022
263 Jan 07, 2023
1k Dec 31, 2022
5 Dec 02, 2022
129 Dec 30, 2022
9 May 20, 2022
2 Dec 27, 2021
174 Dec 20, 2022
61 Nov 28, 2022
6 Sep 05, 2022
762 Jan 02, 2023
38 Dec 11, 2022
74 Dec 28, 2022
19 Dec 10, 2022
142 Dec 09, 2022
87 Jan 03, 2023
2 Oct 06, 2022