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This source code release accompanies the manuscript:

Z. Fountas, N. Sajid, P. A.M. Mediano and K. Friston "[Deep active inference agents using Monte-Carlo methods](https://arxiv.org/abs/2006.04176)", arXiv:2006.04176.
Z. Fountas, N. Sajid, P. A.M. Mediano and K. Friston "[Deep active inference agents using Monte-Carlo methods](https://papers.nips.cc/paper/2020/hash/865dfbde8a344b44095495f3591f7407-Abstract.html)", Advances in Neural Information Processing Systems 33 (NeurIPS 2020).

which is accepted for presentation in NeurIPS 2020 and currently available in an online pre-print version. If you use this model or the dynamic dSprites environment in your work, please cite our pre-print.
If you use this model or the dynamic dSprites environment in your work, please cite our paper.

---
### Description
For a quick overview see this [video](https://www.youtube.com/watch?v=KA-lZ3krVtU). In this work, we propose the deep neural architecture illustrated below, which can be used to train scaled-up active inference agents for continuous complex environments based on amortized inference, M-C tree search, M-C dropouts and top-down transition precision, that encourages disentangled latent representations.

<p align="center"><img src="architecture.png" width="600"></p>
<p align="center"><img src="architecture.png" width="700"></p>

We test this architecture on two tasks from the Animal-AI Olympics and a new simple object-sorting task based on [DeepMind's dSprites dataset](https://github.com/deepmind/dsprites-dataset/).

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### Bibtex
```
@article{fountas2020daimc,
title={Deep active inference agents using Monte-Carlo methods},
author={Fountas, Zafeirios and Sajid, Noor and Mediano, Pedro A.M. and Friston, Karl},
journal={arXiv preprint arXiv:2006.04176},
year={2020}
}
@inproceedings{fountas2020daimc,
author = {Fountas, Zafeirios and Sajid, Noor and Mediano, Pedro and Friston, Karl},
booktitle = {Advances in Neural Information Processing Systems},
editor = {H. Larochelle and M. Ranzato and R. Hadsell and M. F. Balcan and H. Lin},
pages = {11662--11675},
publisher = {Curran Associates, Inc.},
title = {Deep active inference agents using Monte-Carlo methods},
url = {https://proceedings.neurips.cc/paper/2020/file/865dfbde8a344b44095495f3591f7407-Paper.pdf},
volume = {33},
year = {2020}
}
```

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