MTCNN（五）c代码概览及权重的更改

痛定思痛。 2022-05-08 07:20 267阅读 0赞

背景：将MTCNN部署在FPGA上需要将其代码设计为C代码，所以训练时的python代码需要转为c代码。

参考资料：[https://github.com/AlphaQi/MTCNN-light][https_github.com_AlphaQi_MTCNN-light]

**目录**

一、代码概览

1.1 各函数作用

1.2 需要改动地方

二、权重的读取

2.1 函数解析

2.2 相关语句

ifstream in(filename.data)读取文件

getline (in,line)获取每行

line.erase相关位置删除n字节

atof(line.data()) 字符串转为浮点

try与catch

\*(pTeam\[count\])++ = atof(line.data());

return

三、更改权重为bin文件

3.1 txt文件改为bin文件

3.3 c程序中代码的读取

四、程序运行

4.1 嵌套顺序

--------------------

# 一、代码概览 #

## 1.1 各函数作用 ##

pikaqiu.cpp为主函数，通过find.findFace(image);对图片运行目标检测操作

mtcnn.h定义Pnet，Rnet，Onet，mtcnn四个的class，其中有private与public

mtcnn.cpp定义函数

*  mtcnn::findFace,
 *  Pnet()创建Pnet，
 *  ~Pnet()释放Pnet内存，
 *  run运行相应网络，
 *  Pnet::generateBbox生成相应备选框，
 *  RnetImage2MatrixInit图像变为矩阵操作

network.h 相关函数声明

network.cpp 相关函数定义，如addbias，featurePad，feature2Matrix，convolution等

pBox.h 定义了pBox，bBox, weight等结构体

pBox.cpp 定义了free上面那些结构体的函数以及show函数，用于输出上面结构体，可能在调试时有作用。

## 1.2 需要改动地方 ##

网络结构的更改，我们的网络结构与原结构不相同

权重的读取，FPGA的读取最好为bin文件，节省内存空间，代码中为txt文件，共6.9MB

FPGA无法处理三指针的问题，需要将代码中的class转为namespace

## 二、权重的读取 ##

权重文件为txt文件，每行一个数据  \[data\] \\n \[data\] \\n  ...权重文件有大量荣誉，比如括号符号。

读取权重的语句，其中根据相应的filename之中读取出权重，然后存入pointTeam的

mydataFmt *pointTeam[13] = {this->conv1_wb->pdata, this->conv1_wb->pbias,         this->prelu_gmma1->pdata, \
                                this->conv2_wb->pdata, this->conv2_wb->pbias, this->prelu_gmma2->pdata, \
                                this->conv3_wb->pdata, this->conv3_wb->pbias, this->prelu_gmma3->pdata, \
                                this->conv4c1_wb->pdata, this->conv4c1_wb->pbias, \
                                this->conv4c2_wb->pdata, this->conv4c2_wb->pbias \
                                };
        string filename = "Pnet.txt";
        readData(filename, dataNumber, pointTeam);

读取函数：

void readData(string filename, long dataNumber[], mydataFmt *pTeam[]){
        
        ifstream in(filename.data());
        string line;
        if(in)
        {  
            int i = 0;
            int count = 0;
            int pos = 0;
            while (getline (in, line))  
            {   
                try{
                    if(i<dataNumber[count]){
                        line.erase(0,1);
                        pos = line.find(']');
                        line.erase(pos,1);
                        *(pTeam[count])++ = atof(line.data());
                    }
                    else{
                        count++;
                        dataNumber[count] += dataNumber[count-1];
    
                        line.erase(0,1);
                        pos = line.find(']');
                        line.erase(pos,1);
                        *(pTeam[count])++ = atof(line.data());
                    }
                    i++;
                }
                catch (exception& e){
                    cout<<" yichang "<<i<<endl;
                    return;
                }
            } 
        }  
        else 
        {  
            cout <<"no such file"<< filename << endl;  
        }
    }

## 2.1 函数解析 ##

将权重文件从txt文件中读出，存入pointTeam的二维指针之中。

逐行将txt中的权重写入相应指针文件之中。

## 2.2 相关语句 ##

### ifstream in(filename.data)读取文件 ###

ifstream 从文件读入到缓冲区

[https://blog.csdn.net/kingstar158/article/details/6859379][https_blog.csdn.net_kingstar158_article_details_6859379]

[https://www.cnblogs.com/batman425/p/3179520.html][https_www.cnblogs.com_batman425_p_3179520.html]

### getline (in,line)获取每行 ###

存储一行数据

[https://baike.baidu.com/item/getline%E5%87%BD%E6%95%B0/3932106?fr=aladdin][https_baike.baidu.com_item_getline_E5_87_BD_E6_95_B0_3932106_fr_aladdin]

### line.erase相关位置删除n字节 ###

string.erase(pos,n)          //删除从pos开始的n个字符    string.erase(0,1);   删除第一个字符

文件中为删除数据两端的中括号

### atof(line.data()) 字符串转为浮点 ###

### try与catch ###

[https://blog.csdn.net/qq\_15037231/article/details/79980604][https_blog.csdn.net_qq_15037231_article_details_79980604]

try语句中出现异常的时候就会执行catch中的语句

### \*(pTeam\[count\])++ = atof(line.data()); ###

pTeam为二维数组，pTeam\[count\]为一维数组的指针，先取址，将数据写入，后++，指针指向下一个位置。

### return ###

从被调函数返回到主调函数继续执行

# 三、更改权重为bin文件 #

## 3.1 txt文件改为bin文件 ##

原始文件为字节文件，较为耗费存储，我们将其存储为二进制文档，就节省很多内存空间。

#weight_txt2bin.py  transfer weightfile
    for line in lines:
        numString=line[1:-2]
        # add this if because the last line is "]"
        # lines not the last line is "]\n"
        if idx==(np.size(lines)-1):
            numString=line[1:-1]  
        numFloat=float(numString)
        numBuffer=struct.pack('f',numFloat)
        binfile.write(numBuffer)
        idx=idx+1

更改前文件为txt格式，有6.9MB，更改后为2.0MB

## 3.3 c程序中代码的读取 ##

调用函数中，mtcnn.cpp中将三个网络读取的.txt改为.bin，readData函数改为下面：

// network.cpp   in   function  readData
    	int count = 0;
    	//while(!feof(weightFILE_ptr)){
    	while(count<prtNum){
    		fread(pTeam[count],sizeof(mydataFmt),dataNumber[count],weightFILE_ptr);
    		printf("count=%d dataNumber[count]=%ld \n",count,dataNumber[count]);
    		count++;
    	}

Read Rnet.bin ,16 pointers
    count=0 dataNumber[count]=756
    count=1 dataNumber[count]=28
    count=2 dataNumber[count]=28
    count=3 dataNumber[count]=12096
    count=4 dataNumber[count]=48
    count=5 dataNumber[count]=48
    count=6 dataNumber[count]=12288
    count=7 dataNumber[count]=64
    count=8 dataNumber[count]=64
    count=9 dataNumber[count]=73728
    count=10 dataNumber[count]=128
    count=11 dataNumber[count]=128
    count=12 dataNumber[count]=256
    count=13 dataNumber[count]=2
    count=14 dataNumber[count]=512
    count=15 dataNumber[count]=4
    Read Onet.bin ,21 pointers
    count=0 dataNumber[count]=864
    count=1 dataNumber[count]=32
    count=2 dataNumber[count]=32
    count=3 dataNumber[count]=18432
    count=4 dataNumber[count]=64
    count=5 dataNumber[count]=64
    count=6 dataNumber[count]=36864
    count=7 dataNumber[count]=64
    count=8 dataNumber[count]=64
    count=9 dataNumber[count]=32768
    count=10 dataNumber[count]=128
    count=11 dataNumber[count]=128
    count=12 dataNumber[count]=294912
    count=13 dataNumber[count]=256
    count=14 dataNumber[count]=256
    count=15 dataNumber[count]=512
    count=16 dataNumber[count]=2
    count=17 dataNumber[count]=1024
    count=18 dataNumber[count]=4
    count=19 dataNumber[count]=2560
    count=20 dataNumber[count]=10
    Read Pnet.bin ,13 pointers
    count=0 dataNumber[count]=270
    count=1 dataNumber[count]=10
    count=2 dataNumber[count]=10
    count=3 dataNumber[count]=1440
    count=4 dataNumber[count]=16
    count=5 dataNumber[count]=16
    count=6 dataNumber[count]=4608
    count=7 dataNumber[count]=32
    count=8 dataNumber[count]=32
    count=9 dataNumber[count]=64
    count=10 dataNumber[count]=2
    count=11 dataNumber[count]=128
    count=12 dataNumber[count]=4
    Read Pnet.bin ,13 pointers
    ...
    time is  18772.8 milli second

读取Pnet的权值重复了六次。我们需要将此读取过程简化。

# 四、程序运行 #

## 4.1 嵌套顺序 ##

我们将程序之中加入printf信息，输出相应的位置信息。

Create Rnet,Read Rnet.bin ,16 pointers
    Create Onet,Read Onet.bin ,21 pointers
    Create mtcnn,simple face
    Create Pnet,Read Pnet.bin ,13 pointers
    Create Pnet,Read Pnet.bin ,13 pointers
    ...
    Create Pnet,Read Pnet.bin ,13 pointers
    Start find Face function
    Start run Pnet
    Start Pnet generate Bbox
    Done Pnet generate Bbox
    Done run Pnet
    Run nms
    Start run Pnet
    Start Pnet generate Bbox
    Done Pnet generate Bbox
    Done run Pnet
    Run nms
    Start run Pnet
    ......
    Start run Pnet
    Start Pnet generate Bbox
    Done Pnet generate Bbox
    Done run Pnet
    Run nms
    Run nms
    Rnet run
    Rnet run
    ......
    Rnet run
    Run nms
    Run Onet
    Run Onet
    ......
    Run Onet
    Run nms
    Done find Face function
    time is  19789 milli second
    Free mtcnn,delete simpleFace
    Free Pnet
    Free Pnet
    Free Pnet
    Free Pnet
    Free Pnet
    Free Pnet
    Free Pnet
    Free Onet
    Free Rnet

更改运行小的头像

Create Rnet,Read Rnet.bin ,16 pointers
    Create Onet,Read Onet.bin ,21 pointers
    Create mtcnn,simple face
    Create Pnet,Read Pnet.bin ,13 pointers
    Create Pnet,Read Pnet.bin ,13 pointers
    Create Pnet,Read Pnet.bin ,13 pointers
    Start find Face function
    Start run Pnet
    Start Pnet generate Bbox
    Done Pnet generate Bbox
    Done run Pnet
    Run nms
    Start run Pnet
    Start Pnet generate Bbox
    Done Pnet generate Bbox
    Done run Pnet
    Run nms
    Start run Pnet
    Start Pnet generate Bbox
    Done Pnet generate Bbox
    Done run Pnet
    Run nms
    Run nms
    Rnet run
    Rnet run
    Rnet run
    Rnet run
    Rnet run
    Rnet run
    Rnet run
    Rnet run
    Rnet run
    Rnet run
    Run nms
    Run Onet
    Run Onet
    Run Onet
    Run nms
    Done find Face function
    time is  8016.19 milli second
    Free mtcnn,delete simpleFace
    Free Pnet
    Free Pnet
    Free Pnet
    Free Onet
    Free Rnet

[https_github.com_AlphaQi_MTCNN-light]: https://github.com/AlphaQi/MTCNN-light
[https_blog.csdn.net_kingstar158_article_details_6859379]: https://blog.csdn.net/kingstar158/article/details/6859379
[https_www.cnblogs.com_batman425_p_3179520.html]: https://www.cnblogs.com/batman425/p/3179520.html
[https_baike.baidu.com_item_getline_E5_87_BD_E6_95_B0_3932106_fr_aladdin]: https://baike.baidu.com/item/getline%E5%87%BD%E6%95%B0/3932106?fr=aladdin
[https_blog.csdn.net_qq_15037231_article_details_79980604]: https://blog.csdn.net/qq_15037231/article/details/79980604