This repository is published and maintained by the Volkswagen Group Machine Learning Research Lab.

Learn more at https://argmax.ai.

AIME

This repository contains the original implementation of AIME in PyTorch.

If you find this code useful, please reference in your paper:

@inproceedings{
zhang2023aime,
title={Action Inference by Maximising Evidence: Zero-Shot Imitation from Observation with World Models},
author={Xingyuan Zhang and Philip Becker-Ehmck and Patrick van der Smagt and Maximilian Karl},
booktitle={Thirty-seventh Conference on Neural Information Processing Systems},
year={2023},
url={https://openreview.net/forum?id=WjlCQxpuxU}
}

Setup

conda create -n aime python=3.9
conda activate aime
conda install pytorch==2.0.0 torchvision==0.15.0 torchaudio==2.0.0 pytorch-cuda=11.7 -c pytorch -c nvidia
pip install -r requirements.txt
pip install -e .

Structure

All the datasets should be placed under datasets/ and the pretrained models should be placed under pretrained-models/. Results will be placed under logs/, which you can view by tensorboard.

Download the datasets and pre-trained models

The datasets and pretrained models can be access from Github Release. All the datasets and models are released under a CC BY 4.0 license. For more details, please check out the Data Card and Model Card.

For datasets, you need to extract it to datasets/ folder by

tar -xzvf <.tgz file> -C datasets/

To generate the walker-mix dataset, please download all the walker datasets and then run the following command:

python scripts/mix_datasets.py -i walker-random walker-plan2explore-buffer walker-stand-buffer walker-walk-buffer -o walker-mix

For pretrain models, you need to extract it to pretrained-models/ folder by

tar -xzvf pretrained-models.tgz -C pretrained-models/

Usage

General

• The supported environments can be found in aime/configs/env/, and supported tasks are listed in each individual environment file under the supported_tasks.
• We support environment_setup to be chose from mdp, lpomdp and visual.
• dataset_name is referring to a folder under the datasets/ folder.
• model_name is referring to a folder under the pretrained-models/ folder.

AIME

Train the dreamer agent

python scripts/train_dreamer.py env=<env_name> env.task=<task_name> environment_setup=<environment_setup>

example:

python scripts/train_dreamer.py env=walker env.task=walk environment_setup=visual

Train the plan2explore agent

python scripts/train_plan2explore.py env=<env_name> environment_setup=<environment_setup>

example:

python scripts/train_plan2explore.py env=walker environment_setup=visual

Train world model from a dataset (Phase 1 in AIME)

python scripts/train_model_only.py env=<env_name> environment_setup=<environment_setup> embodiment_dataset_name=<dataset_name>

example:

python scripts/train_model_only.py env=walker environment_setup=visual embodiment_dataset_name=walker-mix

Train AIME for imitation (Phase 2 in AIME)

python scripts/train_aime.py env=<env_name> env.task=<task> environment_setup=<environment_setup> model_name=<model_name> demonstration_dataset_name=<dataset_name> world_model.free_nats=0.0 world_model.kl_rebalance=null

example:

python scripts/train_aime.py env=walker env.task=run environment_setup=visual model_name=walker-mix-visual demonstration_dataset_name=walker-run-expert world_model.free_nats=0.0 world_model.kl_rebalance=null world_model=rssm

Optional:

• pass kl_only=True to train with only the KL term.
• pass world_model.kl_scale=0.0 to train with only reconstruction term.
• pass use_idm=True to use IDM as guidence, see Appendix C for details.

Baselines

BC

python scripts/train_bc.py env=<env_name> env.task=<task> environment_setup=<environment_setup> demonstration_dataset_name=<dataset_name>

example:

python scripts/train_bc.py env=walker env.task=run environment_setup=mdp demonstration_dataset_name=walker-walk-expert

BCO

python scripts/train_bco.py env=<env_name> env.task=<task> environment_setup=<environment_setup> embodiment_dataset_name=<embodiment_dataset_name> demonstration_dataset_name=<demonstration_dataset_name>

example:

python scripts/train_bco.py env=walker env.task=run environment_setup=mdp embodiment_dataset_name=walker-mix demonstration_dataset_name=walker-run-expert

IIDM

python scripts/train_iidm.py env=<env_name> env.task=<task> environment_setup=<environment_setup> embodiment_dataset_name=<embodiment_dataset_name> demonstration_dataset_name=<demonstration_dataset_name>

example:

python scripts/train_iidm.py env=walker env.task=run environment_setup=mdp embodiment_dataset_name=walker-mix demonstration_dataset_name=walker-run-expert

NOTE:

• If you are using the pretrained models that we published, please make sure you use world_model=rssm for the Walker models, and world_model=rssmo for the Cheetah models.

Results

The normalised scores used in the paper is offered as json files in the results folder and the expert performace that was used to normalised the scores can be accessed with from aime.utils import EXPERT_PERFORMANCE. For each setup, the policy interacts with the environment for 100 trajectories and report the results. Feel free to compare or analyze these results in your works.

Disclaimer

The purpose of this source code is limited to bare demonstration of the experimental section of the related papers.