systolic-array/activations.cpp at master · DPCEKY/systolic-array · GitHub

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//========================================================================
// Activation
//========================================================================
// @brief: activation layer

#include "activations.h"

// get activation type
ACTIVATION get_activation(char *s)
{
    if (strcmp(s, "logistic")==0) return LOGISTIC;
    if (strcmp(s, "loggy")==0) return LOGGY;
    if (strcmp(s, "relu")==0) return RELU;
    if (strcmp(s, "elu")==0) return ELU;
    if (strcmp(s, "relie")==0) return RELIE;
    if (strcmp(s, "plse")==0) return PLSE;
    if (strcmp(s, "hardtan")==0) return HARDTAN;
    if (strcmp(s, "lhtan")==0) return LHTAN;
    if (strcmp(s, "linear")==0) return LINEAR;
    if (strcmp(s, "ramp")==0) return RAMP;
    if (strcmp(s, "leaky")==0) return LEAKY;
    if (strcmp(s, "tanh")==0) return TANH;
    if (strcmp(s, "stair")==0) return STAIR;
    fprintf(stderr, "Couldn't find activation function %s, going with ReLU\n", s);

    return RELU;
}

// select activation type
float activate(float x, ACTIVATION a)
{
    switch(a)
    {
        case LINEAR:
            return linear_activate(x);
        case LOGISTIC:
            return logistic_activate(x);
        case LOGGY:
            return loggy_activate(x);
        case RELU:
            return relu_activate(x);
        case ELU:
            return elu_activate(x);
        case RELIE:
            return relie_activate(x);
        case RAMP:
            return ramp_activate(x);
        case LEAKY:
            return leaky_activate(x);
        case TANH:
            return tanh_activate(x);
        case PLSE:
            return plse_activate(x);
        case STAIR:
            return stair_activate(x);
        case HARDTAN:
            return hardtan_activate(x);
        case LHTAN:
            return lhtan_activate(x);
    }
    return 0;
}

// activate all layers
void activate_array(float *x, const int n, const ACTIVATION a)
{
	for (int i = 0; i < n; i++)
	{
		x[i] = activate(x[i], a);
	}
}

// select gradient type
float gradient(float x, ACTIVATION a)
{
    switch(a)
    {
        case LINEAR:
            return linear_gradient(x);
        case LOGISTIC:
            return logistic_gradient(x);
        case LOGGY:
            return loggy_gradient(x);
        case RELU:
            return relu_gradient(x);
        case ELU:
            return elu_gradient(x);
        case RELIE:
            return relie_gradient(x);
        case RAMP:
            return ramp_gradient(x);
        case LEAKY:
            return leaky_gradient(x);
        case TANH:
            return tanh_gradient(x);
        case PLSE:
            return plse_gradient(x);
        case STAIR:
            return stair_gradient(x);
        case HARDTAN:
            return hardtan_gradient(x);
        case LHTAN:
            return lhtan_gradient(x);
    }
    return 0;
}

// activate all layers
void gradient_array(const float *x, const int n, const ACTIVATION a, float *delta)
{
	for (int i = 0; i < n; i++)
	{
		delta[i] *= gradient(x[i], a);
	}
}