test_svm.py 文件源码

def test_svr_coef_sign():
    # Test that SVR(kernel="linear") has coef_ with the right sign.
    # Non-regression test for #2933.
    X = np.random.RandomState(21).randn(10, 3)
    y = np.random.RandomState(12).randn(10)

    for svr in [svm.SVR(kernel='linear'), svm.NuSVR(kernel='linear'),
                svm.LinearSVR()]:
        svr.fit(X, y)
        assert_array_almost_equal(svr.predict(X),
                                  np.dot(X, svr.coef_.ravel()) + svr.intercept_)