68 lines
2.8 KiB
Markdown
68 lines
2.8 KiB
Markdown
# SAC+AE implementation in PyTorch
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This is PyTorch implementation of SAC+AE from
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**Improving Sample Efficiency in Model-Free Reinforcement Learning from Images** by
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[Denis Yarats](https://cs.nyu.edu/~dy1042/), [Amy Zhang](https://mila.quebec/en/person/amy-zhang/), [Ilya Kostrikov](https://github.com/ikostrikov), [Brandon Amos](http://bamos.github.io/), [Joelle Pineau](https://www.cs.mcgill.ca/~jpineau/), [Rob Fergus](https://cs.nyu.edu/~fergus/pmwiki/pmwiki.php).
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[[Paper]](https://arxiv.org/abs/1910.01741) [[Webpage]](https://sites.google.com/view/sac-ae/home)
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## Requirements
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We assume you have access to a gpu that can run CUDA 9.2. Then, the simplest way to install all required dependencies is to create an anaconda environment by running:
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```
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conda env create -f conda_env.yml
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```
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After the instalation ends you can activate your environment with:
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```
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source activate pytorch_sac_ae
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```
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## Instructions
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To train an SAC+AE agent on the `cheetah run` task from image-based observations run:
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```
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python train.py \
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--domain_name cheetah \
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--task_name run \
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--encoder_type pixel \
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--decoder_type pixel \
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--action_repeat 4 \
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--save_video \
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--save_tb \
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--work_dir ./log \
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--seed 1
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```
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This will produce 'log' folder, where all the outputs are going to be stored including train/eval logs, tensorboard blobs, and evaluation episode videos. One can attacha tensorboard to monitor training by running:
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```
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tensorboard --logdir log
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```
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and opening up tensorboad in your browser.
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The console output is also available in a form:
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```
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| train | E: 1 | S: 1000 | D: 0.8 s | R: 0.0000 | BR: 0.0000 | ALOSS: 0.0000 | CLOSS: 0.0000 | RLOSS: 0.0000
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```
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a training entry decodes as:
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```
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train - training episode
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E - total number of episodes
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S - total number of environment steps
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D - duration in seconds to train 1 episode
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R - episode reward
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BR - average reward of sampled batch
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ALOSS - average loss of actor
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CLOSS - average loss of critic
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RLOSS - average reconstruction loss (only if is trained from pixels and decoder)
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```
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while an evaluation entry:
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```
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| eval | S: 0 | ER: 21.1676
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```
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which just tells the expected reward `ER` evaluating current policy after `S` steps. Note that `ER` is average evaluation performance over `num_eval_episodes` episodes (usually 10).
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## Results
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Our method demonstrates significantly improved performance over the baseline SAC:pixel. It matches the state-of-the-art performance of model-based algorithms, such as PlaNet (Hafner et al., 2018) and SLAC (Lee et al., 2019), as well
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as a model-free algorithm D4PG (Barth-Maron et al., 2018), that also learns from raw images. Our
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algorithm exhibits stable learning across ten random seeds and is extremely easy to implement.
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