[SOLVED] How to import newly compiled python module?

How to import newly compiled python module?

I have compiled lightgbm with GPU support for python from sources following this guide http://lightgbm.readthedocs.io/en/latest/GPU-Windows.html

Test usage from console was succesful:

C:\github_repos\LightGBM\examples\binary_classification>"../../lightgbm.exe" config=train.conf data=binary.train valid=binary.test objective=binary device=gpu
[LightGBM] [Warning] objective is set=binary, objective=binary will be ignored. Current value: objective=binary
[LightGBM] [Warning] data is set=binary.train, data=binary.train will be ignored. Current value: data=binary.train
[LightGBM] [Warning] valid is set=binary.test, valid_data=binary.test will be ignored. Current value: valid=binary.test
[LightGBM] [Info] Finished loading parameters
[LightGBM] [Info] Loading weights...

Then I tried to import in Python with no luck. It import anaconda version without GPU support:

from sklearn.datasets import load_iris
iris = load_iris() 
 
import lightgbm as lgb 
lgtrain = lgb.Dataset(iris.data, iris.target)
lgb_clf = lgb.train(
        {
    'objective' : 'regression',
    'metric' : 'rmse',
    'num_leaves' : 350,
    #'max_depth': 14,
    'learning_rate' : 0.017,
    'feature_fraction' : 0.5,
    'bagging_fraction' : .8,
    'verbosity' : -1 ,
    'device' : 'gpu'

},
        lgtrain,
        num_boost_round=3500,
        verbose_eval=100
    )

But I got

LightGBMError: b'GPU Tree Learner was not enabled in this build. 
Recompile with CMake option -DUSE_GPU=1'

I believe I have to specify the location but how?

Solution

Remove previously installed Python package with the following command:

pip uninstall lightgbm
or

conda uninstall lightgbm

After doing that navigate to the Python package directory and install it with the library file which you've compiled:

cd LightGBM/python-package
python setup.py install --precompile