#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include "activations.h"

float sigmoid(float weighted_sum)
{
    return 1.0 / (1.0 + exp(-weighted_sum));
}

float sigmoid_derivative(float output)
{
    return sigmoid(output) * (1.0 - sigmoid(output));
}

float tan_hyp(float weighted_sum)
{
    return tanh(weighted_sum);
}

float tan_hyp_derivative(float output)
{
    return 1.0 - (tan_hyp(output) * tan_hyp(output));
}

float relu(float weighted_sum)
{
    return (weighted_sum > 0.0) ? weighted_sum : 0.0;
}

float relu_derivative(float output)
{
    return (output > 0.0) ? 1.0 : 0.0;
}

float linear(float weighted_sum)
{
    return weighted_sum;
}

float linear_derivative(float output)
{
    return 1.0;
}