[darknet源码学习（三）]加载预训练权重

流程：parser.c/load_weights()——>parser.c/load_weights_upto()——>parser.c/load_convolutional_weights()

void load_weights(network *net, char *filename)
{
    load_weights_upto(net, filename, net->n);
}

void load_weights_upto(network *net, char *filename, int cutoff)
{
#ifdef GPU
    if(net->gpu_index >= 0){
        cuda_set_device(net->gpu_index);
    }
#endif
    fprintf(stderr, "Loading weights from %s...", filename);
    fflush(stdout);
    FILE *fp = fopen(filename, "rb");
    if(!fp) file_error(filename);

    int major;
    int minor;
    int revision;
    fread(&major, sizeof(int), 1, fp);
    fread(&minor, sizeof(int), 1, fp);
    fread(&revision, sizeof(int), 1, fp);
    if ((major * 10 + minor) >= 2) {
        printf("\n seen 64 \n");
        uint64_t iseen = 0;
        fread(&iseen, sizeof(uint64_t), 1, fp);
        *net->seen = iseen;
    }
    else {
        printf("\n seen 32 \n");
        fread(net->seen, sizeof(int), 1, fp);
    }
    int transpose = (major > 1000) || (minor > 1000);

    int i;
    for(i = 0; i < net->n && i < cutoff; ++i){
        layer l = net->layers[i];
        if (l.dontload) continue;
        if(l.type == CONVOLUTIONAL){
            load_convolutional_weights(l, fp);
        }
        if(l.type == CONNECTED){
            load_connected_weights(l, fp, transpose);
        }
        if(l.type == BATCHNORM){
            load_batchnorm_weights(l, fp);
        }
        if(l.type == CRNN){
            load_convolutional_weights(*(l.input_layer), fp);
            load_convolutional_weights(*(l.self_layer), fp);
            load_convolutional_weights(*(l.output_layer), fp);
        }
        if(l.type == RNN){
            load_connected_weights(*(l.input_layer), fp, transpose);
            load_connected_weights(*(l.self_layer), fp, transpose);
            load_connected_weights(*(l.output_layer), fp, transpose);
        }
        if(l.type == GRU){
            load_connected_weights(*(l.input_z_layer), fp, transpose);
            load_connected_weights(*(l.input_r_layer), fp, transpose);
            load_connected_weights(*(l.input_h_layer), fp, transpose);
            load_connected_weights(*(l.state_z_layer), fp, transpose);
            load_connected_weights(*(l.state_r_layer), fp, transpose);
            load_connected_weights(*(l.state_h_layer), fp, transpose);
        }
        if(l.type == LOCAL){
            int locations = l.out_w*l.out_h;
            int size = l.size*l.size*l.c*l.n*locations;
            fread(l.biases, sizeof(float), l.outputs, fp);
            fread(l.weights, sizeof(float), size, fp);
#ifdef GPU
            if(gpu_index >= 0){
                push_local_layer(l);
            }
#endif
        }
    }
    fprintf(stderr, "Done!\n");
    fclose(fp);
}

void load_convolutional_weights(layer l, FILE *fp)
{
    if(l.binary){
        //load_convolutional_weights_binary(l, fp);
        //return;
    }
    int num = l.n*l.c*l.size*l.size;  //权重的个数
    fread(l.biases, sizeof(float), l.n, fp);  //读入偏置
    if (l.batch_normalize && (!l.dontloadscales)){
        fread(l.scales, sizeof(float), l.n, fp);
        fread(l.rolling_mean, sizeof(float), l.n, fp);
        fread(l.rolling_variance, sizeof(float), l.n, fp);
        if(0){
            int i;
            for(i = 0; i < l.n; ++i){
                printf("%g, ", l.rolling_mean[i]);
            }
            printf("\n");
            for(i = 0; i < l.n; ++i){
                printf("%g, ", l.rolling_variance[i]);
            }
            printf("\n");
        }
        if(0){
            fill_cpu(l.n, 0, l.rolling_mean, 1);
            fill_cpu(l.n, 0, l.rolling_variance, 1);
        }
    }
    fread(l.weights, sizeof(float), num, fp);  //读入权重
    if(l.adam){
        fread(l.m, sizeof(float), num, fp);
        fread(l.v, sizeof(float), num, fp);
    }
    //if(l.c == 3) scal_cpu(num, 1./256, l.weights, 1);
    if (l.flipped) {
        transpose_matrix(l.weights, l.c*l.size*l.size, l.n);
    }
    //if (l.binary) binarize_weights(l.weights, l.n, l.c*l.size*l.size, l.weights);
#ifdef GPU
    if(gpu_index >= 0){
        push_convolutional_layer(l);
    }
#endif
}