Python导入LightGBM出错

Question

我已经在Linux上安装了lightGBM，如下所示：

https://github.com/Microsoft/LightGBM/wiki/Installation-Guide#linux-2

我能够使用CLI成功地运行图形处理器培训(和CPU)：https://github.com/Microsoft/LightGBM/blob/master/docs/GPU-Tutorial.md#run-your-first-learning-task-on-gpu

但是，当我尝试导入python包(python 3.6)时，收到以下错误：

OSError: /home/anaconda3/lib/python3.6/site-packages/lightgbm-0.2-py3.6.egg/lightgbm/lib_lightgbm.so: symbol clCreateCommandQueueWithProperties, version OPENCL_2.0 not defined in file libOpenCL.so.1 with link time reference

我对链接和其他可能存在问题的东西的理解还很陌生。有没有人能提供一些容易遵循的建议？

Answer 1

LightGBM现在提供了一个python API。

import numpy as np
from lightgbm import LGBMClassifier
from sklearn.datasets import make_moons


model = LGBMClassifier(boosting_type='goss', num_leaves=31, max_depth=- 1, learning_rate=0.1, n_estimators=300, device = "gpu")

train, label = make_moons(n_samples=300000, shuffle=True, noise=0.3, random_state=None)

model.fit(train, label)

如果您设法为GPU构建了它，那么设置python接口可能需要几个步骤。

假设构建是成功的，并且库如下所示：

~/Codes/LightGBM$ tree -d -L 1
.
├── build
├── compute
├── docker
├── docs
├── examples
├── helpers
├── include
├── pmml
├── python-package
├── R-package
├── src
├── swig
├── tests
└── windows

只需使用以下命令设置python API即可。

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

install LightGBM with GPU support的源代码详细指南

Answer 2

要在python中使用LGBM，您需要为CLI安装一个python包装器。也许是像this.这样的东西，然后你需要把这个包装器指向命令行界面。您可以查找You分类器/正则表达式，其中有一个名为exec_path的变量。你应该在这里设置绝对路径。

希望这能有所帮助，我将以this wrapper为例，下面是示例：

import numpy as np
from sklearn import datasets, metrics, model_selection
from pylightgbm.models import GBMClassifier
exec = "~/Documents/apps/LightGBM/lightgbm"
X, Y = datasets.make_classification(n_samples=200, n_features=10)
x_train, x_test, y_train, y_test = model_selection.train_test_split(X, Y, test_size=0.2)
clf = GBMClassifier(exec_path=exec, min_data_in_leaf=1)
clf.fit(x_train, y_train, test_data=[(x_test, y_test)])
y_pred = clf.predict(x_test)
print("Accuracy: ", metrics.accuracy_score(y_test, y_pred))

`