mini-caffe：提取所有层特征值

官方代码托管地址：https://github.com/luoyetx/mini-caffe

在Net类中增加以下方法：

const int Net::extract_all_blobs() const {
  for(int blob_idx = 0; blob_idx < blobs_.size(); blob_idx++) {
    shared_ptr<Blob> blob_ptr = blobs_[blob_idx];
    const float *pData = blob_ptr->cpu_data();

      // write to file
      char path[256];
      char id[8];

      strcpy(path, "./minicaffe_blobs_data/");
      sprintf(id, "%d", blob_idx);
      strcat(path, id);
      strcat(path, ".txt");

      FILE *fp = fopen(path, "w+");
      if(!fp)
        fprintf(stderr, "error open file\n");

      // header
      //\ value to key
      char blob_name[256];
      for (auto iter : blob_names_index_)
        if (iter.second == blob_idx){
          strcpy(blob_name, iter.first.c_str());
          break;
        }

      fprintf(fp, blob_name);
      fprintf(fp, "\n");

      for (int w = 0; w < blob_ptr->count(); w++)
        fprintf(fp, "%f\n", pData[w]);
      fclose(fp);
  }

  return 0;
}