Connected layers work forward and backward!

Joseph Redmon

2013-11-06 9b1774bd39d65614cdbd2d4e3815086298008911

 src/connected_layer.c

@@ -1,19 +1,10 @@
#include "connected_layer.h"

#include <math.h>
#include <stdlib.h>
#include <string.h>

double activation(double x)
{
    return x*(x>0);
}

double gradient(double x)
{
    return (x>=0);
}

connected_layer make_connected_layer(int inputs, int outputs)
connected_layer make_connected_layer(int inputs, int outputs, ACTIVATOR_TYPE activator)
{
    int i;
    connected_layer layer;
@@ -32,6 +23,17 @@
    for(i = 0; i < outputs; ++i)
        layer.biases[i] = (double)rand()/RAND_MAX;

    if(activator == SIGMOID){
        layer.activation = sigmoid_activation;
        layer.gradient = sigmoid_gradient;
    }else if(activator == RELU){
        layer.activation = relu_activation;
        layer.gradient = relu_gradient;
    }else if(activator == IDENTITY){
        layer.activation = identity_activation;
        layer.gradient = identity_gradient;
    }

    return layer;
}

@@ -41,39 +43,16 @@
    for(i = 0; i < layer.outputs; ++i){
        layer.output[i] = layer.biases[i];
        for(j = 0; j < layer.inputs; ++j){
            layer.output[i] += input[j]*layer.weights[i*layer.outputs + j];
            layer.output[i] += input[j]*layer.weights[i*layer.inputs + j];
        }
        layer.output[i] = activation(layer.output[i]);
        layer.output[i] = layer.activation(layer.output[i]);
    }
}

void backpropagate_connected_layer(double *input, connected_layer layer)
void learn_connected_layer(double *input, connected_layer layer)
{
    int i, j;
    double *old_input = calloc(layer.inputs, sizeof(double));
    memcpy(old_input, input, layer.inputs*sizeof(double));
    memset(input, 0, layer.inputs*sizeof(double));

    for(i = 0; i < layer.outputs; ++i){
        for(j = 0; j < layer.inputs; ++j){
            input[j] += layer.output[i]*layer.weights[i*layer.outputs + j];
        }
    }
    for(j = 0; j < layer.inputs; ++j){
        input[j] = input[j]*gradient(old_input[j]);
    }
    free(old_input);
}

void calculate_updates_connected_layer(double *input, connected_layer layer)
{
    int i, j;
    for(i = 0; i < layer.outputs; ++i){
        layer.bias_updates[i] += layer.output[i];
        for(j = 0; j < layer.inputs; ++j){
            layer.weight_updates[i*layer.outputs + j] += layer.output[i]*input[j];
        }
    }
    calculate_update_connected_layer(input, layer);
    backpropagate_connected_layer(input, layer);
}

void update_connected_layer(connected_layer layer, double step)
@@ -82,11 +61,36 @@
    for(i = 0; i < layer.outputs; ++i){
        layer.biases[i] += step*layer.bias_updates[i];
        for(j = 0; j < layer.inputs; ++j){
            int index = i*layer.outputs+j;
            layer.weights[index] = layer.weight_updates[index];
            int index = i*layer.inputs+j;
            layer.weights[index] += step*layer.weight_updates[index];
        }
    }
    memset(layer.bias_updates, 0, layer.outputs*sizeof(double));
    memset(layer.weight_updates, 0, layer.outputs*layer.inputs*sizeof(double));
}

void calculate_update_connected_layer(double *input, connected_layer layer)
{
    int i, j;
    for(i = 0; i < layer.outputs; ++i){
        layer.bias_updates[i] += layer.output[i];
        for(j = 0; j < layer.inputs; ++j){
            layer.weight_updates[i*layer.inputs + j] += layer.output[i]*input[j];
        }
    }
}

void backpropagate_connected_layer(double *input, connected_layer layer)
{
    int i, j;

    for(j = 0; j < layer.inputs; ++j){
        double grad = layer.gradient(input[j]);
        input[j] = 0;
        for(i = 0; i < layer.outputs; ++i){
            input[j] += layer.output[i]*layer.weights[i*layer.inputs + j];
        }
        input[j] *= grad;
    }
}