test_kde.py 文件源码

def test_kde_pipeline_gridsearch():
    # test that kde plays nice in pipelines and grid-searches
    X, _ = make_blobs(cluster_std=.1, random_state=1,
                      centers=[[0, 1], [1, 0], [0, 0]])
    pipe1 = make_pipeline(StandardScaler(with_mean=False, with_std=False),
                          KernelDensity(kernel="gaussian"))
    params = dict(kerneldensity__bandwidth=[0.001, 0.01, 0.1, 1, 10])
    search = GridSearchCV(pipe1, param_grid=params, cv=5)
    search.fit(X)
    assert_equal(search.best_params_['kerneldensity__bandwidth'], .1)