LightGBM import error

[llmercury]

Environment info

Operating System: Windows 10 Home, 64 bit
CPU: Intel i7-7700
GPU: GeForce GTX 1070
C++/Python version: Microsoft Visual Studio Community 2017/ Python 3.5.2 /Anaconda 4.3.1 (64-bit)

My laptop has 2 hard drives, C: and D:.

I followed the installation instruction at: https://github.com/Microsoft/LightGBM/wiki/Installation-Guide#windows-2

This has GPU support. For D:\local\boost_1_64_0\ and D:\local\boost_1_64_0\lib64-msvc-14.0, the location of the Boost binaries, I set them to the system environment variables BOOST_ROOT and BOOST_LIBRARYDIR. No errors during installation. After installation, I checked it by "conda list lightgbm", it shows lightgbm 0.1. It appeared fine.

However, when I imported the lightgbm in Jupyter Notebook, I got Error messages:

Error Message:

---

OSError Traceback (most recent call last)
in ()
----> 1 import lightgbm as lgb

D:\Program_Files\Anaconda3\envs\py35\lib\site-packages\lightgbm-0.1-py3.5.egg\lightgbm_init_.py in ()
7 from future import absolute_import
8
----> 9 from .basic import Booster, Dataset
10 from .callback import (early_stopping, print_evaluation, record_evaluation,
11 reset_parameter)

D:\Program_Files\Anaconda3\envs\py35\lib\site-packages\lightgbm-0.1-py3.5.egg\lightgbm\basic.py in ()
29
30
---> 31 _LIB = _load_lib()
32
33

D:\Program_Files\Anaconda3\envs\py35\lib\site-packages\lightgbm-0.1-py3.5.egg\lightgbm\basic.py in _load_lib()
24 if len(lib_path) == 0:
25 return None
---> 26 lib = ctypes.cdll.LoadLibrary(lib_path[0])
27 lib.LGBM_GetLastError.restype = ctypes.c_char_p
28 return lib

D:\Program_Files\Anaconda3\envs\py35\lib\ctypes_init_.py in LoadLibrary(self, name)
423
424 def LoadLibrary(self, name):
--> 425 return self._dlltype(name)
426
427 cdll = LibraryLoader(CDLL)

D:\Program_Files\Anaconda3\envs\py35\lib\ctypes_init_.py in init(self, name, mode, handle, use_errno, use_last_error)
345
346 if handle is None:
--> 347 self._handle = _dlopen(self._name, mode)
348 else:
349 self._handle = handle

OSError: [WinError 126] The specified module could not be found

Please help!

[guolinke]

@llmercury

can you add this line:
print(lib_path) before lib = ctypes.cdll.LoadLibrary(lib_path[0]) in the file D:\Program_Files\Anaconda3\envs\py35\lib\site-packages\lightgbm-0.1-py3.5.egg\lightgbm\basic.py ?
then run it again ?

[llmercury]

I added print(lib_path) and above the same "OSError Traceback" I got the lib_path:

['D:\Program_Files\Anaconda3\envs\py35\lib\site-packages\lightgbm-0.1-py3.5.egg\lightgbm\lib_lightgbm.dll']

And I checked the "lightgbm" folder and lib_lightgbm.dll is indeed in the folder.

[guolinke]

can you try the latest commit ?

[llmercury]

I used "git clone --recursive https://github.com/Microsoft/LightGBM"
Isn't it the latest version? If not, how to get the latest version?

[guolinke]

@llmercury I just commit a fix for this. So you can re-clone the code.

[llmercury]

I re-cloned it. During building, error happened:

CMake Error in CMakeLists.txt:
A logical block opening on the line

D:/PythonModules/LightGBM/CMakeLists.txt:38 (if)

is not closed.

Maybe adding endif() on line 45 or 46?

[guolinke]

@llmercury
sorry, forgot endif. just push a new fix.

[llmercury]

Awesome. Problem solved! Thank a lot! @guolinke

[github-actions]

This issue has been automatically locked since there has not been any recent activity since it was closed. To start a new related discussion, open a new issue at https://github.com/microsoft/LightGBM/issues including a reference to this.