/* INTERNAL FUNCTION
Calculates the activation of a value, given an activation function
and a steepness
*/
fann_type fann_activation(struct fann * ann, unsigned int activation_function, fann_type steepness,
fann_type value)
{
value = fann_mult(steepness, value);
fann_activation_switch(activation_function, value, value);
return value;
}
FANN_EXTERNAL fann_type *FANN_API fann_run(struct fann * ann, const fann_type * input)
{
struct fann_neuron *neuron_it, *last_neuron, *neurons;
unsigned int i, num_connections, num_input, num_output;
fann_type neuron_sum, *output;
fann_type *weights;
struct fann_layer *layer_it, *last_layer;
unsigned int activation_function;
fann_type steepness;
/* store some variabels local for fast access */
struct fann_neuron *first_neuron = ann->first_layer->first_neuron;
fann_type max_sum;
/* first set the input */
num_input = ann->num_input;
for(i = 0; i != num_input; i++)
{
*first_neuron[i].valuePtr = input[i];
}
/* Set the bias neuron in the input layer */
*(ann->first_layer->last_neuron - 1)->valuePtr = 1;
last_layer = ann->last_layer;
for(layer_it = ann->first_layer + 1; layer_it != last_layer; layer_it++)
{
activation_function = layer_it->activation_function;
steepness = layer_it->activation_steepness;
last_neuron = layer_it->last_neuron;
for(neuron_it = layer_it->first_neuron; neuron_it != last_neuron; neuron_it++)
{
if(neuron_it->first_con == neuron_it->last_con)
{
/* bias neurons */
*neuron_it->valuePtr = 1;
continue;
}
neuron_sum = 0;
num_connections = neuron_it->last_con - neuron_it->first_con;
weights = ann->weights + neuron_it->first_con;
neurons = (layer_it - 1)->first_neuron;
/* unrolled loop start */
i = num_connections & 3; /* same as modulo 4 */
switch (i)
{
case 3:
neuron_sum += fann_mult(weights[2], *neurons[2].valuePtr);
case 2:
neuron_sum += fann_mult(weights[1], *neurons[1].valuePtr);
case 1:
neuron_sum += fann_mult(weights[0], *neurons[0].valuePtr);
case 0:
break;
}
for(; i != num_connections; i += 4)
{
neuron_sum +=
fann_mult(weights[i], *neurons[i].valuePtr) +
fann_mult(weights[i + 1], *neurons[i + 1].valuePtr) +
fann_mult(weights[i + 2], *neurons[i + 2].valuePtr) +
fann_mult(weights[i + 3], *neurons[i + 3].valuePtr);
}
/* unrolled loop end */
/*
* for(i = 0;i != num_connections; i++){
* printf("%f += %f*%f, ", neuron_sum, weights[i], neurons[i].value);
* neuron_sum += fann_mult(weights[i], neurons[i].value);
* }
*/
neuron_sum = fann_mult(steepness, neuron_sum);
max_sum = 150/steepness;
if(neuron_sum > max_sum)
neuron_sum = max_sum;
else if(neuron_sum < -max_sum)
neuron_sum = -max_sum;
*neuron_it->sumPtr = neuron_sum;
fann_activation_switch(activation_function, neuron_sum, *neuron_it->valuePtr);
}
}
/* set the output */
output = ann->output;
num_output = ann->num_output;
neurons = (ann->last_layer - 1)->first_neuron;
for(i = 0; i != num_output; i++)
{
output[i] = *neurons[i].valuePtr;
}
return ann->output;
}
FANN_EXTERNAL fann_type *FANN_API fann_run(struct fann * ann, fann_type * input)
{
struct fann_neuron *neuron_it, *last_neuron, *neurons, **neuron_pointers;
unsigned int i, num_connections, num_input, num_output;
fann_type neuron_sum, *output;
fann_type *weights;
struct fann_layer *layer_it, *last_layer;
unsigned int activation_function;
fann_type steepness;
/* store some variabels local for fast access */
struct fann_neuron *first_neuron = ann->first_layer->first_neuron;
#if 0
__m128 xmm_weight, xmm_neurons, xmm_sum;
#endif
#ifdef FIXEDFANN
int multiplier = ann->multiplier;
unsigned int decimal_point = ann->decimal_point;
/* values used for the stepwise linear sigmoid function */
fann_type r1 = 0, r2 = 0, r3 = 0, r4 = 0, r5 = 0, r6 = 0;
fann_type v1 = 0, v2 = 0, v3 = 0, v4 = 0, v5 = 0, v6 = 0;
fann_type last_steepness = 0;
unsigned int last_activation_function = 0;
#else
fann_type max_sum;
#endif
/* first set the input */
num_input = ann->num_input;
for(i = 0; i != num_input; i++)
{
#ifdef FIXEDFANN
if(fann_abs(input[i]) > multiplier)
{
printf
("Warning input number %d is out of range -%d - %d with value %d, integer overflow may occur.\n",
i, multiplier, multiplier, input[i]);
}
#endif
first_neuron[i].value = input[i];
}
/* Set the bias neuron in the input layer */
#ifdef FIXEDFANN
(ann->first_layer->last_neuron - 1)->value = multiplier;
#else
(ann->first_layer->last_neuron - 1)->value = 1;
#endif
last_layer = ann->last_layer;
for(layer_it = ann->first_layer + 1; layer_it != last_layer; layer_it++)
{
last_neuron = layer_it->last_neuron;
for(neuron_it = layer_it->first_neuron; neuron_it != last_neuron; neuron_it++)
{
if(neuron_it->first_con == neuron_it->last_con)
{
/* bias neurons */
#ifdef FIXEDFANN
neuron_it->value = multiplier;
#else
neuron_it->value = 1;
#endif
continue;
}
activation_function = neuron_it->activation_function;
steepness = neuron_it->activation_steepness;
neuron_sum = 0;
num_connections = neuron_it->last_con - neuron_it->first_con;
weights = ann->weights + neuron_it->first_con;
if(ann->connection_rate >= 1)
{
if(ann->network_type == FANN_NETTYPE_SHORTCUT)
{
neurons = ann->first_layer->first_neuron;
}
else
{
neurons = (layer_it - 1)->first_neuron;
}
/* unrolled loop start */
i = num_connections & 3; /* same as modulo 4 */
switch (i)
{
case 3:
neuron_sum += fann_mult(weights[2], neurons[2].value);
case 2:
neuron_sum += fann_mult(weights[1], neurons[1].value);
case 1:
neuron_sum += fann_mult(weights[0], neurons[0].value);
case 0:
break;
}
#if 0
xmm_sum = _mm_setzero_ps();
for(; i != num_connections; i += 4)
{
xmm_weight = _mm_loadu_ps(weights + i);
xmm_neurons = _mm_set_ps(neurons[i + 3].value,neurons[i + 2].value,
neurons[i + 1].value,neurons[i].value);
xmm_weight = _mm_mul_ps(xmm_weight,xmm_neurons);
xmm_sum =_mm_add_ps(xmm_sum,xmm_weight);
}
neuron_sum += xmm_sum.m128_f32[3] + xmm_sum.m128_f32[2] +
xmm_sum.m128_f32[1] + xmm_sum.m128_f32[0];
#else
for(; i != num_connections; i += 4)
{
neuron_sum +=
fann_mult(weights[i], neurons[i].value) +
fann_mult(weights[i + 1], neurons[i + 1].value) +
fann_mult(weights[i + 2], neurons[i + 2].value) +
fann_mult(weights[i + 3], neurons[i + 3].value);
}
#endif
/* unrolled loop end */
/*
* for(i = 0;i != num_connections; i++){
* printf("%f += %f*%f, ", neuron_sum, weights[i], neurons[i].value);
* neuron_sum += fann_mult(weights[i], neurons[i].value);
* }
*/
}
else
{
neuron_pointers = ann->connections + neuron_it->first_con;
i = num_connections & 3; /* same as modulo 4 */
switch (i)
{
case 3:
neuron_sum += fann_mult(weights[2], neuron_pointers[2]->value);
case 2:
neuron_sum += fann_mult(weights[1], neuron_pointers[1]->value);
case 1:
neuron_sum += fann_mult(weights[0], neuron_pointers[0]->value);
case 0:
break;
}
#if 0
xmm_sum = _mm_setzero_ps();
for(; i != num_connections; i += 4)
{
xmm_weight = _mm_loadu_ps(weights + i);
xmm_neurons = _mm_set_ps(neuron_pointers[i + 3]->value,neuron_pointers[i + 2]->value,
neuron_pointers[i + 1]->value,neuron_pointers[i + 0]->value);
xmm_weight = _mm_mul_ps(xmm_weight,xmm_neurons);
xmm_sum =_mm_add_ps(xmm_sum,xmm_weight);
}
neuron_sum += xmm_sum.m128_f32[3] + xmm_sum.m128_f32[2] +
xmm_sum.m128_f32[1] + xmm_sum.m128_f32[0];
#else
for(; i != num_connections; i += 4)
{
neuron_sum +=
fann_mult(weights[i], neuron_pointers[i]->value) +
fann_mult(weights[i + 1], neuron_pointers[i + 1]->value) +
fann_mult(weights[i + 2], neuron_pointers[i + 2]->value) +
fann_mult(weights[i + 3], neuron_pointers[i + 3]->value);
}
#endif
}
#ifdef FIXEDFANN
neuron_it->sum = fann_mult(steepness, neuron_sum);
if(activation_function != last_activation_function || steepness != last_steepness)
{
switch (activation_function)
{
case FANN_SIGMOID:
case FANN_SIGMOID_STEPWISE:
r1 = ann->sigmoid_results[0];
r2 = ann->sigmoid_results[1];
r3 = ann->sigmoid_results[2];
r4 = ann->sigmoid_results[3];
r5 = ann->sigmoid_results[4];
r6 = ann->sigmoid_results[5];
v1 = ann->sigmoid_values[0] / steepness;
v2 = ann->sigmoid_values[1] / steepness;
v3 = ann->sigmoid_values[2] / steepness;
v4 = ann->sigmoid_values[3] / steepness;
v5 = ann->sigmoid_values[4] / steepness;
v6 = ann->sigmoid_values[5] / steepness;
break;
case FANN_SIGMOID_SYMMETRIC:
case FANN_SIGMOID_SYMMETRIC_STEPWISE:
r1 = ann->sigmoid_symmetric_results[0];
r2 = ann->sigmoid_symmetric_results[1];
r3 = ann->sigmoid_symmetric_results[2];
r4 = ann->sigmoid_symmetric_results[3];
r5 = ann->sigmoid_symmetric_results[4];
r6 = ann->sigmoid_symmetric_results[5];
v1 = ann->sigmoid_symmetric_values[0] / steepness;
v2 = ann->sigmoid_symmetric_values[1] / steepness;
v3 = ann->sigmoid_symmetric_values[2] / steepness;
v4 = ann->sigmoid_symmetric_values[3] / steepness;
v5 = ann->sigmoid_symmetric_values[4] / steepness;
v6 = ann->sigmoid_symmetric_values[5] / steepness;
break;
case FANN_THRESHOLD:
break;
}
}
switch (activation_function)
{
case FANN_SIGMOID:
case FANN_SIGMOID_STEPWISE:
neuron_it->value =
(fann_type) fann_stepwise(v1, v2, v3, v4, v5, v6, r1, r2, r3, r4, r5, r6, 0,
multiplier, neuron_sum);
break;
case FANN_SIGMOID_SYMMETRIC:
case FANN_SIGMOID_SYMMETRIC_STEPWISE:
neuron_it->value =
(fann_type) fann_stepwise(v1, v2, v3, v4, v5, v6, r1, r2, r3, r4, r5, r6,
-multiplier, multiplier, neuron_sum);
break;
case FANN_THRESHOLD:
neuron_it->value = (fann_type) ((neuron_sum < 0) ? 0 : multiplier);
break;
case FANN_THRESHOLD_SYMMETRIC:
neuron_it->value = (fann_type) ((neuron_sum < 0) ? -multiplier : multiplier);
break;
case FANN_LINEAR:
neuron_it->value = neuron_sum;
break;
case FANN_LINEAR_PIECE:
neuron_it->value = (fann_type)((neuron_sum < 0) ? 0 : (neuron_sum > multiplier) ? multiplier : neuron_sum);
break;
case FANN_LINEAR_PIECE_SYMMETRIC:
neuron_it->value = (fann_type)((neuron_sum < -multiplier) ? -multiplier : (neuron_sum > multiplier) ? multiplier : neuron_sum);
break;
case FANN_ELLIOT:
case FANN_ELLIOT_SYMMETRIC:
case FANN_GAUSSIAN:
case FANN_GAUSSIAN_SYMMETRIC:
case FANN_GAUSSIAN_STEPWISE:
case FANN_SIN_SYMMETRIC:
case FANN_COS_SYMMETRIC:
fann_error((struct fann_error *) ann, FANN_E_CANT_USE_ACTIVATION);
break;
}
last_steepness = steepness;
last_activation_function = activation_function;
#else
neuron_sum = fann_mult(steepness, neuron_sum);
max_sum = 150/steepness;
if(neuron_sum > max_sum)
neuron_sum = max_sum;
else if(neuron_sum < -max_sum)
neuron_sum = -max_sum;
neuron_it->sum = neuron_sum;
fann_activation_switch(activation_function, neuron_sum, neuron_it->value);
#endif
}
}
/* set the output */
output = ann->output;
num_output = ann->num_output;
neurons = (ann->last_layer - 1)->first_neuron;
for(i = 0; i != num_output; i++)
{
output[i] = neurons[i].value;
}
return ann->output;
}
