ncnn：提取所有层特征值

官方代码托管地址：https://github.com/Tencent/ncnn

在Extractor类中添加以下方法：

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int Extractor::extract_all_blobs() {     for (int blob_index = 0; blob_index < blob_mats.size(); blob_index++)     {       Mat outMat;       extract(blob_index, outMat);         // write to file       char path[256];       char id[8];         strcpy(path, "./ncnn_blobs_data/");       sprintf(id, "%d", blob_index);       strcat(path, id);       strcat(path, ".txt");         FILE *fp = fopen(path, "w+");       if(!fp)         fprintf(stderr, "error open file\n");         // header       fprintf(fp, net->blobs[blob_index].name.c_str());       fprintf(fp, "\n");         for (int idx = 0; idx < outMat.w * outMat.h * outMat.c; idx++)         fprintf(fp, "%f\n", outMat[idx]);       fclose(fp);     }       return 0; }