YOLO v7中显示置信度的代码在哪里

YOLO v7是不存在的，可能是您指的是YOLOv3或YOLOv4。在YOLOv3的代码中，显示置信度的代码在`src/detection_layer.c`文件中的`draw_detections()`函数中，具体实现如下：

void draw_detections(image im, detection *dets, int num, float thresh, char **names, image **alphabet, int classes)
{
    int i,j;

    for(i = 0; i < num; ++i){
        char labelstr[4096] = {0};
        int class_ = -1;
        for(j = 0; j < classes; ++j){
            if (dets[i].prob[j] > thresh){
                if (class_ < 0) {
                    strcat(labelstr, names[j]);
                    class_ = j;
                } else {
                    strcat(labelstr, ", ");
                    strcat(labelstr, names[j]);
                }
                printf("%s: %.0f%%\n", names[j], dets[i].prob[j]*100);
            }
        }
        if(class_ >= 0){
            int width = im.h * .006;
            printf("%d %s: %.0f%%\n", i, names[class_], dets[i].prob[class_]*100);
            int offset = class_*123457 % classes;
            float red = get_color(2,offset,classes);
            float green = get_color(1,offset,classes);
            float blue = get_color(0,offset,classes);
            float rgb[3];

            //width = prob*20+2;

            rgb[0] = red;
            rgb[1] = green;
            rgb[2] = blue;
            box b = dets[i].bbox;
            //printf("%f %f %f %f\n", b.x, b.y, b.w, b.h);

            int left  = (b.x-b.w/2.)*im.w;
            int right = (b.x+b.w/2.)*im.w;
            int top   = (b.y-b.h/2.)*im.h;
            int bot   = (b.y+b.h/2.)*im.h;

            if(left < 0) left = 0;
            if(right > im.w-1) right = im.w-1;
            if(top < 0) top = 0;
            if(bot > im.h-1) bot = im.h-1;

            draw_box_width(im, left, top, right, bot, width, red, green, blue);
            if (alphabet) {
                image label = get_label(alphabet, labelstr, (im.h*.03));
                draw_label(im, top + width, left, label, rgb);
                free_image(label);
            }
            else {
                int len = strlen(labelstr) * 10;
                if (left < len) left = len;
                draw_label(im, top + width, left - len, labelstr, rgb);
            }
        }
    }
}

在上述代码中，`printf("%s: %.0f%%\n", names[j], dets[i].prob[j]*100)`就是显示置信度的代码。其中，`names`是类别名称的数组，`dets[i].prob[j]`是第i个检测框中第j个类别的置信度。