OS Error: dlopen ... Reason: image not found

[kumikoda]

System

• 2017 Macbook Pro 15-inch
• macOS Big Sur v11.5.2
• python 3.7.9

Problem

(venv) anson ~/numerai/example-scripts (master)
$ python3 example_model.py
Traceback (most recent call last):
  File "example_model.py", line 2, in <module>
    from lightgbm import LGBMRegressor
  File "/Users/anson/numerai/example-scripts/venv/lib/python3.7/site-packages/lightgbm/__init__.py", line 8, in <module>
    from .basic import Booster, Dataset, register_logger
  File "/Users/anson/numerai/example-scripts/venv/lib/python3.7/site-packages/lightgbm/basic.py", line 95, in <module>
    _LIB = _load_lib()
  File "/Users/anson/numerai/example-scripts/venv/lib/python3.7/site-packages/lightgbm/basic.py", line 86, in _load_lib
    lib = ctypes.cdll.LoadLibrary(lib_path[0])
  File "/usr/local/Cellar/python@3.7/3.7.9_2/Frameworks/Python.framework/Versions/3.7/lib/python3.7/ctypes/__init__.py", line 442, in LoadLibrary
    return self._dlltype(name)
  File "/usr/local/Cellar/python@3.7/3.7.9_2/Frameworks/Python.framework/Versions/3.7/lib/python3.7/ctypes/__init__.py", line 364, in __init__
    self._handle = _dlopen(self._name, mode)
OSError: dlopen(/Users/anson/numerai/example-scripts/venv/lib/python3.7/site-packages/lightgbm/lib_lightgbm.so, 6): Library not loaded: /usr/local/opt/libomp/lib/libomp.dylib
  Referenced from: /Users/anson/numerai/example-scripts/venv/lib/python3.7/site-packages/lightgbm/lib_lightgbm.so
  Reason: image not found

Solution

brew install libomp
microsoft/LightGBM#1369