This repository was archived by the owner on May 29, 2026. It is now read-only.
Repository navigation
This repository was archived by the owner on May 29, 2026. It is now read-only.
🐛[BUG]: Import error: No module named 'physicsnemo.sym' after pip install the module #282
Description
Version
2.3.0
On which installation method(s) does this occur?
Pip
Describe the issue
Tried to run some examples under physicsnemo/examples/cfd/swe_nonlinear_pino that imports physicsnemo.sym. Program reported "Import error: No module named 'physicsnemo.sym'" even after installing the sym module.
The whole process:
git clonephysicsnemo- under the root folder:
uv sync - also under the root folder:
uv pip install torch torchvision
uv pip install Cython
uv pip install nvidia-physicsnemo-sym --no-build-isolation
- installtion succeeded.
uv pip show nvidia-physicsnemo-symreports version number normally - run an example:
uv run python examples/cfd/swe_nonlinear_pino/train_swe_nl_pino.py. Program aborted with following message:
Warp DeprecationWarning: The namespace `warp.context` will soon be removed from the public API. It can still be accessed from `warp._src.context` but might be changed or removed without notice.
Warp DeprecationWarning: The symbol `warp.context.Device` will soon be removed from the public API. Use `warp.Device` instead.
Traceback (most recent call last):
File "/home/MY_USER_NAME/physicsnemo/examples/cfd/swe_nonlinear_pino/train_swe_nl_pino.py", line 33, in <module>
from swe_nl_pde import SWE_NL
File "/home/MY_USER_NAME/physicsnemo/examples/cfd/swe_nonlinear_pino/swe_nl_pde.py", line 17, in <module>
from physicsnemo.sym.eq.pde import PDE
ModuleNotFoundError: No module named 'physicsnemo.sym'
### Minimum reproducible example
```shell
As described in the description.
Relevant log output
Environment details
running on WSL-Ubuntu (24.04 LTS). CUDA Toolkit version: 12.8.0Other/Misc.
No response
Activity
SinaAkhyani commentedon Feb 24, 2026
I tried the following installation commands and worked for me:
pip install --upgrade pip
pip install ninja
pip install torch==2.8.0 torchvision==0.23.0
pip install nvidia-physicsnemo
pip install nvidia-physicsnemo-sym --no-build-isolation
ShawnLiaoyx commentedon Feb 27, 2026
Thanks for replying. This way worked for me as well. The problem is that pip install packages are too old and are not compatible with examples right now. When installing the version as recommend by README.md, the problem I described in the issue happens.
I finally figured out that the error was because physicsnemo.sym installed from pip was not under physicsnemo, which was installed from uv. I added the following code to
physicsnemo/__init__.pyto solve the problem:Hopefully the dev team can help to make the installation of physicsnemo and physicsnemo.sym more unified. Incorporating my modification could be a way.
ktangsali commentedon Apr 29, 2026
Closing as part of the archival of this repository. The key components have been upstreamed to NVIDIA/physicsnemo. Please refer to the v2.0 Migration Guide and feel free to re-open your issue there if it is still relevant.