| # Troubleshooting | |
| ## Pip package version mismatch | |
| If you observe any of the following during [installation of GR00T](installation.md), you can ignore those errors. | |
| The GR00T policy runs on an older version of torch library with flash attention, and all other tools in this repository do not require | |
| torch>=2.7. Thus we downgrade the torch and related software to support GR00T inference. Mimic-related data generation workflows are not impacted. | |
| <pre> | |
| ERROR: pip's dependency resolver does not currently take into account all the packages that are installed. This behaviour is the source of the following dependency conflicts. | |
| isaaclab 0.37.2 requires trimesh, which is not installed. | |
| dex-retargeting 0.4.6 requires lxml>=5.2.2, which is not installed. | |
| dex-retargeting 0.4.6 requires trimesh>=4.4.0, which is not installed. | |
| isaaclab-tasks 0.10.31 requires torch>=2.7, but you have torch 2.5.1 which is incompatible. | |
| isaacsim-kernel 5.0.0 requires wrapt==1.16.0, but you have wrapt 1.14.1 which is incompatible. | |
| isaaclab-rl 0.2.0 requires pillow==11.0.0, but you have pillow 11.2.1 which is incompatible. | |
| isaaclab-rl 0.2.0 requires torch>=2.7, but you have torch 2.5.1 which is incompatible. | |
| isaaclab 0.37.2 requires pillow==11.0.0, but you have pillow 11.2.1 which is incompatible. | |
| isaaclab 0.37.2 requires starlette==0.46.0, but you have starlette 0.45.3 which is incompatible. | |
| isaaclab 0.37.2 requires torch>=2.7, but you have torch 2.5.1 which is incompatible. | |
| isaacsim-core 5.0.0 requires torch==2.7.0, but you have torch 2.5.1 which is incompatible. | |
| </pre> | |
| ## Running on DGX Spark and Blackwell GPUs | |
| Unfortunately, due to limited support of flash attention module (by May 2025), GR00T policy is not supported on DGX Spark and Blackwell GPUs. However you can run Mimic-related data generation workflows and GR00T-Lerobot data conversion on Blackwell. Blackwell support is coming soon. | |
| ## Running evaluation on Multiple GPUs | |
| For rendering, please refer to the [Omniverse Developer Guideline](https://docs.omniverse.nvidia.com/dev-guide/latest/linux-troubleshooting.html#q9-how-to-specify-what-gpus-to-run-omniverse-apps-on) for setting single-gpu mode or multi-gpu mode of Isaac Sim. For physics, we suggest to the evaluation to run on CPU | |
| set by `simulation_device` in evaluation. | |
| However, GR00T N1 policy only supports single-GPU inference (by May 2025). We have not tested on multi-GPU inference. | |