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SVM predict code is, finally, I will determine class by predict value.

int svmPredict(const char* classifier, const char* vocaname, const char* query, const char* method)
{
    // load image
    cv::Mat img = cv::imread(query, CV_LOAD_IMAGE_GRAYSCALE);

    // load svm
    cv::SVM svm;
    svm.load(classifier);

    // declare BOWImgDescriptorExtractor
    cv::Ptr<cv::DescriptorMatcher> matcher = cv::DescriptorMatcher::create("FlannBased");
    cv::Ptr<cv::DescriptorExtractor> extractor = new cv::SurfDescriptorExtractor();
    cv::BOWImgDescriptorExtractor dextract( extractor, matcher );

    // load vocabulary data
    cv::Mat vocabulary;
    cv::FileStorage fs( vocaname, cv::FileStorage::READ);
    fs["vocabulary data"] >> vocabulary;
    fs.release();
    if( vocabulary.empty()  ) return 1;

    // Set the vocabulary
    dextract.setVocabulary( vocabulary );
    std::vector<cv::KeyPoint> keypoints;
    detector.detect( img, keypoints);
    cv::Mat desc_bow;
    dextract.compute( img, keypoints, desc_bow );
    if( desc_bow.empty() )  return 1;

    // svm predict
    float predict = svm.predict(centroids, true);

    std::cout << predict << std::endl;

    return 0;
}