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Massively parallel rigidbody physics simulation on accelerator hardware.

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I'm currently doing a project related to transferring control policies from simulator to simulator. This lead me to try to standardize action and observation spaces between brax and mujoco. I...

good first issue

currently, policy_params_fn exists only in ppo algorithm. are you going to update the policy clalback function to other algorithms too?

Hi, I am trying to run the [tutorial training notebook](https://colab.research.google.com/github/google/brax/blob/main/notebooks/training.ipynb) locally. However the HTML rendering seems to be quite flickering. The first render stacked on top of each other [simplescreenrecorder-2024-03-16_11.38.05.webm](https://github.com/google/brax/assets/3454586/156e5221-d388-436d-9b33-8a637b0e07d7)...

I'm on MacOS Sonoma, and when training completes, I get: ``` File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/os.py", line 225, in makedirs mkdir(name, mode) OSError: [Errno 30] Read-only file system: '/saved_videos' ``` I've done `chmod...

It would be nice to have a wrapper under `brax.envs.wrappers` which takes an Env and a context length, and wraps the Env so that the obs space of the new...

good first issue

When I try to render the scene without any contacts, I encounter the following error: ``` Traceback (most recent call last): File "/home/pcy/Research/code/crazyswarm2-adaptive/utils/redis_minimum/mbd_core.py", line 201, in main(tyro.cli(Args)) File "/home/pcy/Research/code/crazyswarm2-adaptive/utils/redis_minimum/mbd_core.py", line...

Fix `flags.DEFINE_integer('policy updates', None, Number of policy updates in APG.')` to have an underscore `flags.DEFINE_integer('policy_updates', None, Number of policy updates in APG.')`, and maybe add a test to check if...

Hi ! I'm doing research on value-based deep RL. I've been enjoying Brax very much lately ! My question is about which of the 4 backends (spring, positional, generalized, mjx)...

Hello, I have been encountering an issue where my training runs error free and learns well, but then control values of NaN are generated at inference when collecting a trajectory...

I have the following test file, which I use to test whether my domain randomization implementation works. The idea is that I condition (randomized) environments on the same action and...