ModuleNotFoundError: No module named 'physicsnemo.sym.hydra' #290

I did Title: ImportError when running EM waveguide example: cannot import from physicsnemo.sym.hydra

Environment:

• OS: macOS 14.4 (Apple Silicon)
• Python: 3.11.?
• CUDA: N/A (CPU only, Mac)
• PhysicsNeMo version: (output of pip show nvidia-physicsnemo)
• Installation method:
  • uv pip install "nvidia-physicsnemo[sym]"

Description:

I am trying to run the EM waveguide example from the PhysicsNeMo repository:

git clone https://github.com/NVIDIA/physicsnemo.git
cd physicsnemo/examples/EM
python waveguide.py

However, the script fails at the import statement on line 9:

from physicsnemo.sym.hydra import to_absolute_path, instantiate_arch, PhysicsNeMoConfig

Error log:

Traceback (most recent call last):
waveguide.py", line 9, in <module>
    from physicsnemo.sym.hydra import to_absolute_path, instantiate_arch, PhysicsNeMoConfig
    ...

From the documentation and source it appears that:

• to_absolute_path and instantiate_arch should be available via physicsnemo.sym.hydra docs link,
• PhysicsNeMoConfig is defined in physicsnemo.sym.hydra.config. [web:35][web:38][web:41]

So this import line seems to follow the official examples such as helmholtz_ntk.py and heat_sink.py which use:

import physicsnemo.sym
from physicsnemo.sym.hydra import to_absolute_path, instantiate_arch, PhysicsNeMoConfig

[web:36][web:39]

Questions:

1. Is this a packaging issue with nvidia-physicsnemo[sym] on PyPI when used with uv?
2. Is there a different recommended import path for to_absolute_path, instantiate_arch, and PhysicsNeMoConfig in the latest release?
3. Are there any known limitations for running the EM examples on macOS / CPU-only environments?

Any guidance or a minimal working example for running examples/EM/waveguide.py with the pip-installed nvidia-physicsnemo[sym] package would be greatly appreciated.