Verilog-NN : Deep Feed Forward : DFF

 

3input : 4 hidden 1'st layer : 3 hidden 2'nd layer : 1 output layer 

module NeuralNetwork(input clk,
                     input [2:0] inputs,
                     output reg [0:0] output);
  
  reg [3:0] hidden_neurons_layer1;
  reg [2:0] hidden_neurons_layer2;
  reg [0:0] output_neuron;
  
  // weights for inputs to first hidden layer
  parameter w0 = 0.3;
  parameter w1 = 0.4;
  parameter w2 = 0.2;
  parameter w3 = 0.1;
  
  // weights for first hidden layer to second hidden layer
  parameter w4 = 0.5;
  parameter w5 = 0.7;
  parameter w6 = 0.2;
  
  // weights for second hidden layer to output
  parameter w7 = 0.6;
  parameter w8 = 0.7;
  parameter w9 = 0.3;
  
  always @(posedge clk) begin
    hidden_neurons_layer1[0] <= inputs[0] * w0 + inputs[1] * w1 + inputs[2] * w2;
    hidden_neurons_layer1[1] <= inputs[0] * w2 + inputs[1] * w1 + inputs[2] * w0;
    hidden_neurons_layer1[2] <= inputs[0] * w3 + inputs[1] * w2 + inputs[2] * w1;
    hidden_neurons_layer1[3] <= inputs[0] * w1 + inputs[1] * w2 + inputs[2] * w3;
    
    hidden_neurons_layer2[0] <= hidden_neurons_layer1[0] * w4 + hidden_neurons_layer1[1] * w5 + hidden_neurons_layer1[2] * w6;
    hidden_neurons_layer2[1] <= hidden_neurons_layer1[1] * w5 + hidden_neurons_layer1[2] * w6 + hidden_neurons_layer1[3] * w4;
    hidden_neurons_layer2[2] <= hidden_neurons_layer1[2] * w6 + hidden_neurons_layer1[3] * w4 + hidden_neurons_layer1[0] * w5;
    
    output_neuron <= hidden_neurons_layer2[0] * w7 + hidden_neurons_layer2[1] * w8 + hidden_neurons_layer2[2] * w9;
  end
  
  assign output = output_neuron;
endmodule

 

 

https://towardsdatascience.com/the-mostly-complete-chart-of-neural-networks-explained-3fb6f2367464

The mostly complete chart of Neural Networks, explained

 

 

module DFFN(input x[3:0], output y);
  reg [3:0] h1, h2;
  wire [3:0] z1, z2;
  
  // Layer 1
  assign z1 = x + h1;
  always @(x) h1 = (z1 > 0) ? z1 : 0;
  
  // Layer 2
  assign z2 = h1 + h2;
  always @(h1) h2 = (z2 > 0) ? z2 : 0;
  
  // Output layer
  assign y = h2[3];
endmodule