when using SFace model by c++ to match two faces , the output is always 1.0000

[crmlei]

I write a c++ demo code using SFace model,but I find the match ouput is always 1.0000

The python code has correct output: ( the face image has already been aligned and croped from original big image to 112*112)

sface_model = cv.FaceRecognizerSF.create(
        model="./face_recognition_sface_2021dec.onnx",
        config="",
        backend_id=0,
        target_id=0
        )
    img1 = cv.imread("./tmp/face_112x112_0.bmp")
    feat1 = sface_model.feature(img1)
    print(feat1)

    img2 = cv.imread("./tmp/match/face_112x112_1.bmp")
    feat2 = sface_model.feature(img2)

    cosine_score = sface_model.match(feat1, feat2, 0)

    print("cosine_score=",cosine_score)

python output 's screenshot:

the c++ demo code is here:

std::string sface_model_file = "./face_recognition_sface_2021dec.onnx";
    cv::Ptr<cv::FaceRecognizerSF> sface_model = nullptr;
    sface_model = cv::FaceRecognizerSF::create(sface_model_file,"",cv::dnn::DNN_BACKEND_OPENCV,cv::dnn::DNN_TARGET_CPU);
    printf("Init SFace model ok\n");

    cv::Mat face_mat1 = cv::imread("./tmp/face_112x112_0.bmp");
    cv::Mat face_feat1;
    //face_feat1.convertTo(face_feat1, CV_32FC3, 1.0 / 255, 0);
    sface_model->feature( face_mat1,face_feat1);

    //print feature value, the values seems to be totaly different from the values output in Python :-)
    for(int j=0;j<face_feat1.cols;j++)
    {
        double *f = (double*)face_feat1.data + j;
        printf("%lf ",*f);
       
    }
    printf("\n");


    cv::Mat face_mat2 = cv::imread("./tmp/face_112x112_1.bmp");
    cv::Mat face_feat2;
    //face_feat2.convertTo(face_feat2, CV_32FC3, 1.0 / 255, 0);
    sface_model->feature( face_mat2,face_feat2);

    double  cosine_sim = sface_model->match( face_feat1,face_feat2,0);
    printf("sim=%.4lf\n",cosine_sim);

c++ output's :

Env: centos on x64/gcc 8.3/python 3.6.8/opencv-4.5.5

want help..... :-) :-) Thanks !

[fengyuentau]

double f = (double)face_feat1.data + j;

I believe it should be a float pointer instead.

[crmlei]

Yes , Using float has printed same values output by Python.:-) Thanks,

but the match result is still 1.000,

Have I lost some preprocess or postprocess codes in c++?

[fengyuentau]

printf("sim=%.4lf\n",cosine_sim);

Maybe the usage of printf is wrong: printf("sim=%.4f\n",cosine_sim);. See this https://stackoverflow.com/questions/4264127/correct-format-specifier-for-double-in-printf.