一起学习用Verilog在FPGA上实现CNN----(四)池化层设计

痛定思痛。 2023-09-23 19:23 17阅读 0赞

# 1 池化层设计 #

自顶而下分析池化层的设计过程

## 1.1 Average Pool Multi Layer ##

图为该项目的平均池化层，其包含一个AvgPoolSingle单元，模块的输入为图像特征矩阵，输出为池化后的特征矩阵

![在这里插入图片描述][65c85e1ae9864dd081858435851d12ff.png_pic_center]  
`图片来自附带的技术文档《Hardware Documentation》`

池化层的原理图如图所示，其中输入位宽为75264，输出位宽为18816。池化层位于卷积层和激活层之后，第一次卷积层输出位宽为75264，因此池化层的输入位宽为75264。Average Pool Multi Layer的深度为6，前卷积层的输出特征H和W均为28，故输入位宽为28x28x6x16=75264；平均池化窗口大小为2x2，输出特征H和W变为14，输出位宽为14x14x6x16=18816

![在这里插入图片描述][7c66ba2764e647c9967b6b6fdad66471.png_pic_center]

## 1.2 Average Pool Single Layer ##

该单元是执行单个通道的平均池化操作，由多个AvgU组成，如图所示：

![在这里插入图片描述][1b7926130f6a4c83986e0b30148dc517.png_pic_center]  
`图片来自附带的技术文档《Hardware Documentation》`

原理图如图所示，该单元输入位宽为12544，输出位宽为3136。前一层卷积输出特征H为28，W为28，Average Pool Single Layer的深度为1，因此输入位宽为28x28x1x16=12544；该项目平均池化的窗口大小为2x2，故输出位宽为14x14x1x16=3136

![在这里插入图片描述][99155d1e484943bd9e64f087fdcf7402.png_pic_center]

## 1.3 Averaging Unit ##

Averaging Unit如图所示，求输入4个数的均值。该单元先求4个数A、B、C、D的和，再将和乘以0.25得到4个数的均值

![在这里插入图片描述][1e094a985d0e4c05a963eb3f0ea59b75.png_pic_center]  
`图片来自附带的技术文档《Hardware Documentation》`

原理图如图所示，输入为4个位宽16的数，输出为位宽16的均值

![在这里插入图片描述][fe02134fc8334f34840cfb1e982c898f.png_pic_center]

# 2 代码实现 #

## 2.1 AvgUnit ##

### 2.1.1 设计输入 ###

创建AvgUnit文件，操作如图：

![在这里插入图片描述][0b09ee98f49c4fb9ba0e00c9dbfad884.png_pic_center]

输入文件名：

![在这里插入图片描述][22d7078a98af43a0b6a688851fb3a2ca.png_pic_center]

确认创建：

![在这里插入图片描述][b26efec2a62f4f3496be408cc128f0d0.png_pic_center]

双击打开，输入代码：

module AvgUnit (numA,numB,numC,numD,AvgOut);
      
    parameter DATA_WIDTH = 16;
    
    input [DATA_WIDTH-1:0] numA,numB,numC,numD;
    output [DATA_WIDTH-1:0] AvgOut;
    
    wire [DATA_WIDTH-1:0] add1result;
    wire [DATA_WIDTH-1:0] add2result;
    wire [DATA_WIDTH-1:0] add3result;
    reg [DATA_WIDTH-1:0] quarter = 16'b0011010000000000;
    
    floatAdd16 FADD1 (numA,numB,add1result);
    floatAdd16 FADD2 (add1result,numC,add2result);
    floatAdd16 FADD3 (add2result,numD,add3result);  
    floatMult16 FM (add3result,quarter,AvgOut);  
    endmodule

如图所示：

![在这里插入图片描述][f3e3713f558f4addae68df3f053655c0.png_pic_center]

### 2.1.2 分析与综合 ###

将AvgUnit设置为顶层：

![在这里插入图片描述][152c516d626648f78aba5998c544cd41.png_pic_center]

对设计进行分析，操作如图：

![在这里插入图片描述][88d814d975364babb2df1907fc9e43fc.png_pic_center]

分析后的设计，Vivado自动生成原理图，如图：

![在这里插入图片描述][77502e31c5b842edbf8286a47f25d24d.png_pic_center]

AvgUnit原理图如图：

![在这里插入图片描述][72c0ed8ba4904d0db63221194f64f9ec.png_pic_center]

对设计进行综合，操作如图：

![在这里插入图片描述][e7ec957334b84bb9bd6cfd25616ee1cb.png_pic_center]

综合完成，关闭即可：

![在这里插入图片描述][23e4b115b3e642119a011b671f38fdab.png_pic_center]

### 2.1.3 功能仿真 ###

创建TestBench，操作如图所示：

![在这里插入图片描述][3a633697e54e47f581d4ce6688d2b251.png_pic_center]

输入激励文件名tb\_AvgUnit：

![在这里插入图片描述][b10f1ba252e54c1eaf0eb07171081552.png_pic_center]

双击打开，输入激励代码：

`timescale 1ns / 1ps
    module tb_AvgUnit();
    reg [15:0] numA;
    reg [15:0] numB;
    reg [15:0] numC;
    reg [15:0] numD;
    wire [15:0] AvgOut;
    
    initial begin
    	
    	// Avg(2,3,4,5) = 3.5
    	#0
      numA = 16'h4000;
      numB = 16'h4200;
      numC = 16'h4400;
      numD = 16'h4500;
    
    	// Avg(1,2,3,4) = 2.5
    	#10
    	numA = 16'h3C00;
      numB = 16'h4000;
      numC = 16'h4200;
      numD = 16'h4400;
    	
    	// Avg(-1,-2,-3,-4) = -2.5
    	#10
    	numA = 16'hBC00;
      numB = 16'hC000;
      numC = 16'hC200;
      numD = 16'hC400;
      
      // Avg(-2,-3,-4,-5) = 3.5
      #10
    	numA = 16'hC000;
      numB = 16'hC200;
      numC = 16'hC400;
      numD = 16'hC500;
      #10
    	$stop;
    end
    
    AvgUnit UUT
    (
        .numA(numA),
        .numB(numB),
        .numC(numC),
        .numD(numD),
        .AvgOut(AvgOut)
    );
    
    endmodule

如图所示：

![在这里插入图片描述][95c915c9f4f846b78c31fe33bd9cdf62.png_pic_center]

将tb\_AvgUnit设置为顶层：

![在这里插入图片描述][d395282326684fc99362c8d39530089f.png_pic_center]

开始进行仿真，操作如下:

![在这里插入图片描述][b25a00c2c79a45529bd66b7b2269ab4d.png_pic_center]

开始仿真，如图：

![在这里插入图片描述][6282818956e74392b92366565018785d.png_pic_center]

仿真波形，如图所示：

![在这里插入图片描述][0f3fa4578b644c5cbe7012d109f952a6.png_pic_center]

仿真结束，关闭仿真：

![在这里插入图片描述][0e9cfcb5472749699a4affadb262e2d3.png_pic_center]

## 2.2 AvgPoolSingle ##

### 2.2.1 设计输入 ###

创建AvgPoolSingle文件，如图：

![在这里插入图片描述][2b365ebeeeb246f0b8f5c0418165ef09.png_pic_center]

双击打开，输入代码：

module AvgPoolSingle(aPoolIn,aPoolOut);
      
    parameter DATA_WIDTH = 16;
    parameter InputH = 28;
    parameter InputW = 28;
    parameter Depth = 1;
    
    input [0:InputH*InputW*Depth*DATA_WIDTH-1] aPoolIn;
    output [0:(InputH/2)*(InputW/2)*Depth*DATA_WIDTH-1] aPoolOut;
    
    genvar i,j;
    
    generate  // 2x2的池化窗口 
      for (i=0; i<(InputH); i=i+2) begin
        for (j=0; j<(InputW); j=j+2) begin
        AvgUnit
        #(
         .DATA_WIDTH(DATA_WIDTH)
         )
         AU
        (
          .numA(aPoolIn[(i*InputH+j)*DATA_WIDTH+:DATA_WIDTH]),
          .numB(aPoolIn[(i*InputH+j+1)*DATA_WIDTH+:DATA_WIDTH]),
          .numC(aPoolIn[((i+1)*InputH+j)*DATA_WIDTH+:DATA_WIDTH]),
          .numD(aPoolIn[((i+1)*InputH+j+1)*DATA_WIDTH+:DATA_WIDTH]),
          .AvgOut(aPoolOut[(i/2*InputH/2+j/2)*DATA_WIDTH+:DATA_WIDTH])
          );
        end
      end
    endgenerate
    endmodule

如图所示：

![在这里插入图片描述][2e6267ad18074c0cbc38106f1ca13e6a.png_pic_center]

### 2.2.2 分析与综合 ###

将AvgPoolSingle文件设置为顶层：

![在这里插入图片描述][ac2121da111747f48a774781bd16a471.png_pic_center]

关闭上次的分析文件：

![在这里插入图片描述][5e21610e404546acadaa3a3b85e96a95.png_pic_center]

对本次设计进行分析，操作如图：

![在这里插入图片描述][4d065c56b3974be38406f715f6b39cd4.png_pic_center]

分析后的设计，Vivado自动生成原理图，如图：

![在这里插入图片描述][8220f6e0d37c4fa38e4c11d560ee6abe.png_pic_center]

该模块由多个AvgUnit组成，如图：

![在这里插入图片描述][a45f0dc120074f66ba81820f950b7ac6.png_pic_center]

对设计进行综合，操作如图：

![在这里插入图片描述][ec911e0444b544daa28344e65249761d.png_pic_center]

综合完成，关闭即可：

![在这里插入图片描述][af2bb909c57049798bbd3c0ba6b87850.png_pic_center]

### 2.2.3 功能仿真 ###

创建TestBench，操作如图所示：

![在这里插入图片描述][fd0fa7c94cab48348667658d6506f87c.png_pic_center]

双击打开，输入激励代码：

`timescale 1ns / 1ps
    module tb_AvgPoolSingle();
    reg [28*28*16-1:0] inAvg;
    wire [14*14*16-1:0] outAvg;
    
    initial begin
        #0
        inAvg = 12544'h4000440040004400400044004000440040004400400044004000440040004400400044004000440040004400400044004000440040004400450042004500420045004200450042004500420045004200450042004500420045004200450042004500420045004200450042004500420040004400400044004000440040004400400044004000440040004400400044004000440040004400400044004000440040004400400044004500420045004200450042004500420045004200450042004500420045004200450042004500420045004200450042004500420045004200400044004000440040004400400044004000440040004400400044004000440040004400400044004000440040004400400044004000440045004200450042004500420045004200450042004500420045004200450042004500420045004200450042004500420045004200450042004000440040004400400044004000440040004400400044004000440040004400400044004000440040004400400044004000440040004400450042004500420045004200450042004500420045004200450042004500420045004200450042004500420045004200450042004500420040004400400044004000440040004400400044004000440040004400400044004000440040004400400044004000440040004400400044004500420045004200450042004500420045004200450042004500420045004200450042004500420045004200450042004500420045004200400044004000440040004400400044004000440040004400400044004000440040004400400044004000440040004400400044004000440045004200450042004500420045004200450042004500420045004200450042004500420045004200450042004500420045004200450042004000440040004400400044004000440040004400400044004000440040004400400044004000440040004400400044004000440040004400450042004500420045004200450042004500420045004200450042004500420045004200450042004500420045004200450042004500420040004400400044004000440040004400400044004000440040004400400044004000440040004400400044004000440040004400400044004500420045004200450042004500420045004200450042004500420045004200450042004500420045004200450042004500420045004200400044004000440040004400400044004000440040004400400044004000440040004400400044004000440040004400400044004000440045004200450042004500420045004200450042004500420045004200450042004500420045004200450042004500420045004200450042004000440040004400400044004000440040004400400044004000440040004400400044004000440040004400400044004000440040004400450042004500420045004200450042004500420045004200450042004500420045004200450042004500420045004200450042004500420040004400400044004000440040004400400044004000440040004400400044004000440040004400400044004000440040004400400044004500420045004200450042004500420045004200450042004500420045004200450042004500420045004200450042004500420045004200400044004000440040004400400044004000440040004400400044004000440040004400400044004000440040004400400044004000440045004200450042004500420045004200450042004500420045004200450042004500420045004200450042004500420045004200450042004000440040004400400044004000440040004400400044004000440040004400400044004000440040004400400044004000440040004400450042004500420045004200450042004500420045004200450042004500420045004200450042004500420045004200450042004500420040004400400044004000440040004400400044004000440040004400400044004000440040004400400044004000440040004400400044004500420045004200450042004500420045004200450042004500420045004200450042004500420045004200450042004500420045004200;
        #10
        $stop;
    end
    AvgPoolSingle UUT
      (
        .aPoolIn(inAvg),
        .aPoolOut(outAvg)
      );
    endmodule

如图所示：

![在这里插入图片描述][9ba6222b9d1d4e88865152f361581ef6.png_pic_center]  
将tb\_AvgPoolSingle设置为顶层：

![在这里插入图片描述][9ec083ba32ea413a90d424dc9098550a.png_pic_center]

开始进行仿真，操作如图：

![在这里插入图片描述][d49e9f16b36446c1945c905fb8d195a9.png_pic_center]

如图，开始仿真：

![在这里插入图片描述][9a62aba395ee4a7fb60b68ade7c14757.png_pic_center]

仿真波形，如图：

![在这里插入图片描述][cf13480190444161990ba2c6d212e64f.png_pic_center]

仿真完成，关闭仿真：

![在这里插入图片描述][71a71b47e43b4df6b92c910416b2de67.png_pic_center]

## 2.3 AvgPoolMulti ##

### 2.3.1 设计输入 ###

创建AvgPoolMulti文件，如图：

![在这里插入图片描述][1dae969d63f543c79cd7a46a7d7bb35d.png_pic_center]

双击打开，输入代码：

module AvgPoolMulti(clk, reset, apInput, apOutput);
    
    parameter DATA_WIDTH = 16;
    parameter D = 6;
    parameter H = 28;
    parameter W = 28;
    
    input reset,clk;
    input [0:H*W*D*DATA_WIDTH-1] apInput;
    output reg [0:(H/2)*(W/2)*D*DATA_WIDTH-1] apOutput;
    
    reg [0:H*W*DATA_WIDTH-1] apInput_s;
    wire [0:(H/2)*(W/2)*DATA_WIDTH-1] apOutput_s;
    integer counter;
    
    
    AvgPoolSingle
      #(
          .DATA_WIDTH(DATA_WIDTH),
          .InputH(H),
          .InputW(W)
      ) AvgPool
      (
          .aPoolIn(apInput_s),
          .aPoolOut(apOutput_s)
      );
    
    always @ (posedge clk or posedge reset) begin
      if (reset == 1'b1) begin
        counter = 0;
      end
      else if (counter<D) begin 
        counter = counter+1;
      end
    end
    
    always @ (*) begin
      apInput_s = apInput[counter*H*W*DATA_WIDTH+:H*W*DATA_WIDTH];
      apOutput[counter*(H/2)*(W/2)*DATA_WIDTH+:(H/2)*(W/2)*DATA_WIDTH] = apOutput_s;
    end
    
    endmodule

如图所示：

![在这里插入图片描述][1431d1692024485fb83c2da451144775.png_pic_center]

将AvgPoolMulti设置为顶层：

![在这里插入图片描述][949984cc0b574d29858f494ec083f2b9.png_pic_center]

### 2.3.2 分析与综合 ###

对设计进行分析，操作如图：

![在这里插入图片描述][0ddb221467864c9395711117503a1809.png_pic_center]

分析后的设计，Vivado自动生成原理图，如图：

![在这里插入图片描述][c8436f6f2c0e489a8c44212154ab9a12.png_pic_center]

原理图如图所示：

![在这里插入图片描述][084024401a4540559c06ed662f8db232.png_pic_center]

对设计进行综合，操作如图：

![在这里插入图片描述][4587b1bb508443e6b35b4273e4d5cfae.png_pic_center]

### 2.3.3 功能仿真 ###

创建TestBench，操作如图所示：

![在这里插入图片描述][796a4ca82534485aa29322933455ee26.png_pic_center]  
双击打开，输入激励代码：

`timescale 1ns / 1ps
    module tb_AvgPoolMulti();
    reg clk,reset;
    reg [6*28*28*16-1:0] inAvg;
    wire [6*14*14*16-1:0] outAvg;
    
    localparam PERIOD = 100;
    
    integer i;
    
    always
    	#(PERIOD/2) clk = ~clk;
    	
    initial begin
        #0
        clk = 1'b0;
    	  reset = 1;
        inAvg = 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        #(PERIOD)
    	  reset = 0;
        #(8*PERIOD)
        for (i = 6*14*14-1; i >=0; i = i - 1) begin
    		  $displayh(outAvg[i*16+:16]);
    	  end
        $stop;
    end
    AvgPoolMulti UUT
      (
        .clk(clk),
        .reset(reset),
        .apInput(inAvg),
        .apOutput(outAvg)
      );
    endmodule

如图所示：

![在这里插入图片描述][9764f35d861e40fba2594439544cc52e.png_pic_center]  
将tb\_AvgPoolMulti设置为顶层：

![在这里插入图片描述][101db8b7272242319721b2973e5d6401.png_pic_center]

开始进行仿真，操作如下:

![在这里插入图片描述][4d0a9247cf0a4b75a0c513a40b34b71d.png_pic_center]

如图，开始仿真：

![在这里插入图片描述][fff6597c5c2f49ad802b16df651d09af.png_pic_center]

仿真波形，如图所示：

![在这里插入图片描述][5dc7fd8b6d9e4c09a6dd216565cc8a05.png_pic_center]

仿真结束，关闭仿真：

![在这里插入图片描述][eac0a63371ad4ea3b06ca229c8fc1b3c.png_pic_center]

## 2.4 IntegrationConv ##

### 2.4.1 设计输入 ###

双击打开integrationConv文件，修改代码为：

module integrationConv (clk,reset,CNNinput,Conv1F,Conv2F,iConvOutput);
    
    parameter DATA_WIDTH = 16;
    parameter ImgInW = 32;
    parameter ImgInH = 32;
    parameter Conv1Out = 28;
    parameter AvgP1out = 14;
    parameter Conv2Out = 10;
    parameter Kernel = 5;
    parameter AvgP2out = 5;
    parameter DepthC1 = 6;
    parameter DepthC2 = 16;
    
    
    input clk, reset;
    input [ImgInW*ImgInH*DATA_WIDTH-1:0] CNNinput;
    input [Kernel*Kernel*DepthC1*DATA_WIDTH-1:0] Conv1F;
    input [DepthC2*Kernel*Kernel*DepthC1*DATA_WIDTH-1:0] Conv2F;
    output [DepthC2*DATA_WIDTH-1:0] iConvOutput;
    
    reg C1rst,AP1rst,Tanh1Reset;
    wire Tanh1Flag;
    
    wire [Conv1Out*Conv1Out*DepthC1*DATA_WIDTH-1:0] C1out;
    wire [Conv1Out*Conv1Out*DepthC1*DATA_WIDTH-1:0] C1outTanH;
    
    wire [AvgP1out*AvgP1out*DepthC1*DATA_WIDTH-1:0] AP1out;
    
    convLayerMulti C1
    (
    	.clk(clk),
    	.reset(reset),
    	.image(CNNinput),
    	.filters(Conv1F),
    	.outputConv(C1out)
    );
    
    UsingTheTanh16
    #(.nofinputs(Conv1Out*Conv1Out*DepthC1))
    Tanh1(
          .x(C1out),
          .clk(clk),
          .Output(C1outTanH),
          .resetExternal(Tanh1Reset),
          .FinishedTanh(Tanh1Flag)
          );
    
    AvgPoolMulti AP1
      (
        .clk(clk),
        .reset(reset),
        .apInput(C1outTanH),
        .apOutput(AP1out)
      );
    convLayerMulti
    #(
      .DATA_WIDTH(16),
      .D(6),
      .H(14),
      .W(14),
      .F(5),
      .K(16)
    ) C2 
    (
    	.clk(clk),
    	.reset(reset),
    	.image(AP1out),
    	.filters(Conv2F),
    	.outputConv(iConvOutput)
    );
    endmodule

如图所示：

![在这里插入图片描述][54af534f0fc947fdb6d948be14d98ea0.png_pic_center]

将integrationConv设置为顶层：

![在这里插入图片描述][17950992711b49db90b38255a39a5069.png_pic_center]

关闭上次的分析文件：

![在这里插入图片描述][44afddddd2334ddf9b30ce5ed9b232be.png_pic_center]

### 2.4.2 分析与综合 ###

对设计进行分析，操作如图：

![在这里插入图片描述][21d3df0ebc79448d8c5ccb19b5a2289d.png_pic_center]

分析后的设计，Vivado自动生成原理图，如图：

![在这里插入图片描述][288f04bd4e4f448196ccbaae8700bbb4.png_pic_center]

顶层原理图，如图所示：

![在这里插入图片描述][9dc064d4fb2845beb99c8749c11610b8.png_pic_center]

对设计进行综合，操作如图：

![在这里插入图片描述][e15d628c061a4e2faed580ffbea44931.png_pic_center]

**希望本文对大家有帮助，上文若有不妥之处，欢迎指正**

**分享决定高度，学习拉开差距**

[65c85e1ae9864dd081858435851d12ff.png_pic_center]: https://img-blog.csdnimg.cn/65c85e1ae9864dd081858435851d12ff.png#pic_center
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