import sionna with Mac-os M2 is not working

[sshrinivasbhat]

Hello,
I am getting the following errors when importing Sionna
Macos Ventura 13.4.1
Anaconda

 import sionna
Traceback (most recent call last):
  File "/Users/shrinivas/anaconda3/lib/python3.11/site-packages/mitsuba/__init__.py", line 107, in __getattribute__
    _import('mitsuba.mitsuba_' + variant + '_ext'),
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/shrinivas/anaconda3/lib/python3.11/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "<frozen importlib._bootstrap>", line 1206, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1178, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1149, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 676, in _load_unlocked
  File "<frozen importlib._bootstrap>", line 573, in module_from_spec
  File "<frozen importlib._bootstrap_external>", line 1233, in create_module
  File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
ImportError: jit_init_thread_state(): the LLVM backend is inactive because the LLVM shared library ("libLLVM.dylib") could not be found! Set the DRJIT_LIBLLVM_PATH environment variable to specify its path.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/shrinivas/anaconda3/lib/python3.11/site-packages/sionna/__init__.py", line 19, in <module>
    from . import rt
  File "/Users/shrinivas/anaconda3/lib/python3.11/site-packages/sionna/rt/__init__.py", line 25, in <module>
    mi.set_variant('llvm_ad_rgb')
  File "/Users/shrinivas/anaconda3/lib/python3.11/site-packages/mitsuba/__init__.py", line 317, in set_variant
    _import('mitsuba.ad.integrators')
  File "/Users/shrinivas/anaconda3/lib/python3.11/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/shrinivas/anaconda3/lib/python3.11/site-packages/mitsuba/python/ad/__init__.py", line 1, in <module>
    from .integrators import *
  File "/Users/shrinivas/anaconda3/lib/python3.11/site-packages/mitsuba/python/ad/integrators/__init__.py", line 25, in <module>
    importlib.import_module('mitsuba.ad.integrators.' + name)
  File "/Users/shrinivas/anaconda3/lib/python3.11/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/shrinivas/anaconda3/lib/python3.11/site-packages/mitsuba/python/ad/integrators/prbvolpath.py", line 6, in <module>
    from .common import RBIntegrator, mis_weight
  File "/Users/shrinivas/anaconda3/lib/python3.11/site-packages/mitsuba/python/ad/integrators/common.py", line 8, in <module>
    class ADIntegrator(mi.CppADIntegrator):
                       ^^^^^^^^^^^^^^^^^^
  File "/Users/shrinivas/anaconda3/lib/python3.11/site-packages/mitsuba/__init__.py", line 253, in __getattribute__
    result = module.__getattribute__(key)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/shrinivas/anaconda3/lib/python3.11/site-packages/mitsuba/__init__.py", line 115, in __getattribute__
    raise AttributeError(e)
AttributeError: jit_init_thread_state(): the LLVM backend is inactive because the LLVM shared library ("libLLVM.dylib") could not be found! Set the DRJIT_LIBLLVM_PATH environment variable to specify its path.

Please help to resolve this,

[merlinND]

Hello @sshrinivasbhat,

Since the CUDA backend is not available on your platform, Sionna defaults to the LLVM backend of Mitsuba, which requires installing LLVM. Could you please try following these instructions and let us know if the problem is resolved?

https://drjit.readthedocs.io/en/latest/firststeps-py.html#llvm-backend
https://drjit.readthedocs.io/en/stable/what.html#backends

[chenbin234]

Hey, I ran into the same issue, but the link's not working. Can you send the instructions again? Thanks!

[merlinND]

https://drjit.readthedocs.io/en/stable/firststeps-py.html#llvm-backend
https://drjit.readthedocs.io/en/stable/what.html#backends

[chenbin234]

Thank you so much

[yhaddint]

I've met a similar problem in my MacBook M2 when importing Sionna. After applying what @merlinND suggested, the error message becomes
jit_llvm_init(): detected LLVM version lacks critical functionality, shutting down LLVM backend..

I checked the version and by default the installed LLVM 17.0.1. I reinstalled LLVM 16 using
brew install llvm@16
and set the path using
export DRJIT_LIBLLVM_PATH="/opt/homebrew/opt/llvm@16/lib/libLLVM.dylib"
The issue has been fixed in my machine.

[merlinND]

Thank you for reporting back @yhaddint!

[fklement]

@yhaddint Thank's worked fine!

[Varots]

Worked also for me! Thanks!

[optimist76]

@merlinND
https://drjit.readthedocs.io/en/stable/firststeps-py.html#llvm-backend is not working for me.
thanks

[merlinND]

See above for the updated link. The DrJit documentation has been overhauled since then.
Keep in mind this answer if installing the latest LLVM version doesn't work: #160 (comment)