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ad4cl.h
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ad4cl.h
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/*
* File: adcl.h
* Author: Matthew
*
* Created on January 22, 2015, 3:38 PM
*/
#ifndef ADCL_H
#define ADCL_H
#include <math.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#ifndef DEFAULT_ENTRY_SIZE
#define DEFAULT_ENTRY_SIZE 10000000
#endif
#ifndef MAX_VARIABLE_IN_EXPESSION
#define MAX_VARIABLE_IN_EXPESSION 2
#endif
//#define USE_ATOMICS
#ifdef USE_ATOMICS
#define atomic_inc(ptr) InterlockedIncrement(&ptr)-1
#else
#define atomic_inc(ptr) ptr++;
#endif
#ifdef __cplusplus
extern "C" {
#endif
struct /*__attribute__ ((packed))*/ ad_variable {
double value;
int id;
};
struct /*__attribute__ ((packed))*/ ad_pair {
double dx;
int id;
};
struct /*__attribute__ ((packed))*/ ad_entry {
struct ad_pair coeff[MAX_VARIABLE_IN_EXPESSION];
int id;
int size;
};
struct /*__attribute__ ((packed))*/ ad_gradient_structure {
struct ad_entry* gradient_stack;
int current_variable_id;
int stack_current;
int recording;
int counter;
};
/**
* Creates a new gradient_structure.
* @param size - length of the entries array.
* @return
*/
struct ad_gradient_structure* create_gradient_structure(int size) {
struct ad_gradient_structure* gs = ( struct ad_gradient_structure*)malloc(sizeof (ad_gradient_structure));
gs->current_variable_id = 0;
gs->recording = 1;
gs->stack_current = 0;
gs->gradient_stack = (struct ad_entry*)malloc(sizeof (ad_entry) * size);
return gs;
}
/**
* To be called after the gradient_structure has been run in a
* OpenCL application. This does not need to be called if the
* gradient_structure has only been run on the host.
* @param gs
*/
inline void gpu_restore(struct ad_gradient_structure* gs) {
gs->current_variable_id += gs->counter;
gs->stack_current += gs->counter;
gs->counter = 0;
}
inline void ad_init_var(struct ad_gradient_structure* gs, struct ad_variable* var, double value){
var->id = atomic_inc(gs->current_variable_id);
var->value = value;
}
/**
* Adds two variables together. If the gradient structure is recording,
* entries will be added, otherwise the result is only computed.
*
* @param gs
* @param a
* @param b
* @return
*/
inline const struct ad_variable ad_plus(struct ad_gradient_structure* gs, struct ad_variable a, struct ad_variable b) {
struct ad_variable ret = {.value = a.value + b.value, .id = 0};
if (gs->recording == 1) {
int current = atomic_inc(gs->stack_current);
ret.id = atomic_inc(gs->current_variable_id);
/*__private*/ struct ad_entry e;
e.coeff[0] = (struct ad_pair){.dx = 1.0, .id = a.id};
e.coeff[1] = (struct ad_pair){.dx = 1.0, .id = b.id};
e.size = 2;
e.id = ret.id;
//barrier(CLK_LOCAL_MEM_FENCE);
gs->gradient_stack[current] = e;
}
return ret;
}
/**
* Adds variable a to double b. If the gradient structure is recording,
* entries will be added, otherwise the result is only computed.
*
* @param gs
* @param a
* @param b
* @return
*/
inline const struct ad_variable ad_plus_vd(struct ad_gradient_structure* gs, struct ad_variable a, double b) {
struct ad_variable ret = {.value = a.value + b, .id = 0};
if (gs->recording == 1) {
int current = atomic_inc(gs->stack_current);
int var_id = atomic_inc(gs->current_variable_id);
/*__private*/ struct ad_entry e;
e.coeff[0] = (struct ad_pair){.dx = 1.0, .id = a.id};
e.size = 1;
e.id = ret.id;
ret.id = var_id;
e.size = 2;
e.id = var_id;
//barrier(CLK_LOCAL_MEM_FENCE);
gs->gradient_stack[current] = e;
}
return ret;
}
/**
* Adds double a to variable b. If the gradient structure is recording,
* entries will be added, otherwise the result is only computed.
*
* @param gs
* @param a
* @param b
* @return
*/
inline const struct ad_variable ad_plus_dv(struct ad_gradient_structure* gs, double a, struct ad_variable b) {
struct ad_variable ret = {.value = a + b.value, .id = gs->current_variable_id++};
if (gs->recording == 1) {
int current = atomic_inc(gs->stack_current);
int var_id = atomic_inc(gs->current_variable_id);
/*__private*/ struct ad_entry e;
e.coeff[0] = (struct ad_pair){.dx = 1.0, .id = b.id};
e.size = 1;
ret.id = var_id;
e.id = var_id;
//barrier(CLK_LOCAL_MEM_FENCE);
gs->gradient_stack[current] = e;
}
return ret;
}
/**
* Plus assign variable a and variable b. If the gradient structure is recording,
* entries will be added, otherwise the result is only computed.
*
* @param gs
* @param a
* @param b
*/
inline void ad_plus_eq_v(struct ad_gradient_structure* gs, struct ad_variable* a, struct ad_variable b) {
a->value += b.value;
if (gs->recording == 1) {
int current = atomic_inc(gs->stack_current);
/*__private*/ struct ad_entry e;
e.coeff[0] = (struct ad_pair){.dx = 1.0, .id = a->id};
e.coeff[1] = (struct ad_pair){.dx = 1.0, .id = b.id};
e.size = 2;
e.id = a->id;
//barrier(CLK_LOCAL_MEM_FENCE);
gs->gradient_stack[current] = e;
}
}
/**
* Plus assign variable a and double b. If the gradient structure is recording,
* entries will be added, otherwise the result is only computed.
*
* @param gs
* @param a
* @param b
*/
inline void ad_plus_eq_d(struct ad_gradient_structure* gs, struct ad_variable* a, double b) {
a->value += b;
if (gs->recording == 1) {
int current = atomic_inc(gs->stack_current);
/*__private*/ struct ad_entry e;
e.coeff[0] = (struct ad_pair){.dx = 1.0, .id = a->id};
e.size = 1;
e.id = a->id;
//barrier(CLK_LOCAL_MEM_FENCE);
gs->gradient_stack[current] = e;
}
}
/**
* Subtracts variable b from variable a. If the gradient structure is recording,
* entries will be added, otherwise the result is only computed.
*
* @param gs
* @param a
* @param b
* @return
*/
inline const struct ad_variable ad_minus(struct ad_gradient_structure* gs, struct ad_variable a, struct ad_variable b) {
struct ad_variable ret = {.value = a.value - b.value, .id = 0};
if (gs->recording) {
int current = atomic_inc(gs->stack_current);
int var_id = atomic_inc(gs->current_variable_id);
/*__private*/ struct ad_entry e;
e.coeff[0] = (struct ad_pair){.dx = 1.0, .id = a.id};
e.coeff[1] = (struct ad_pair){.dx = -1.0, .id = b.id};
e.size = 2;
ret.id = var_id;
e.id = var_id;
//barrier(CLK_LOCAL_MEM_FENCE);
gs->gradient_stack[current] = e;
}
return ret;
}
/**
* Subtracts double b from variable a.If the gradient structure is recording,
* entries will be added, otherwise the result is only computed.
*
* @param gs
* @param a
* @param b
* @return
*/
inline const struct ad_variable ad_minus_vd(struct ad_gradient_structure* gs, struct ad_variable a, double b) {
struct ad_variable ret = {.value = a.value - b, .id = 0};
if (gs->recording == 1) {
int current = atomic_inc(gs->stack_current);
ret.id = atomic_inc(gs->current_variable_id);
/*__private*/ struct ad_entry e;
e.coeff[0] = (struct ad_pair){.dx = 1.0, .id = a.id};
e.size = 1;
e.id = ret.id;
//barrier(CLK_LOCAL_MEM_FENCE);
gs->gradient_stack[current] = e;
}
return ret;
}
/**
* Subtracts variable b from double a. If the gradient structure is recording,
* entries will be added, otherwise the result is only computed.
*
* @param gs
* @param a
* @param b
* @return
*/
inline const struct ad_variable ad_minus_dv(struct ad_gradient_structure* gs, double a, struct ad_variable b) {
struct ad_variable ret = {.value = a - b.value, .id = 0};
if (gs->recording) {
int current = atomic_inc(gs->stack_current);
int var_id = atomic_inc(gs->current_variable_id);
/*__private*/ struct ad_entry e;
e.coeff[0] = (struct ad_pair){.dx = -1.0, .id = b.id};
e.size = 1;
e.id = var_id;
ret.id = var_id;
//barrier(CLK_LOCAL_MEM_FENCE);
gs->gradient_stack[current] = e;
}
return ret;
}
/**
* Multiplies to variables together. If the gradient structure is recording,
* entries will be added, otherwise the result is only computed.
*
* @param gs
* @param a
* @param b
* @return
*/
inline const struct ad_variable ad_times(struct ad_gradient_structure* gs, struct ad_variable a, struct ad_variable b) {
struct ad_variable ret = {.value = a.value * b.value, .id = 0};
if (gs->recording == 1) {
int current = atomic_inc(gs->stack_current);
ret.id = atomic_inc(gs->current_variable_id);
/*__private*/ struct ad_entry e;
e.coeff[0] = (struct ad_pair){.dx = a.value, .id = a.id};
e.coeff[1] = (struct ad_pair){.dx = b.value, .id = b.id};
e.size = 2;
e.id = ret.id;
//barrier(CLK_LOCAL_MEM_FENCE);
gs->gradient_stack[current] = e;
}
return ret;
}
/**
* Multiplies variable a and double b.If the gradient structure is recording,
* entries will be added, otherwise the result is only computed.
*
* @param gs
* @param a
* @param b
* @return
*/
inline const struct ad_variable ad_times_vd(struct ad_gradient_structure* gs, struct ad_variable a, double b) {
struct ad_variable ret = {.value = a.value * b, .id = 0};
if (gs->recording == 1) {
int current = atomic_inc(gs->stack_current);
int var_id = atomic_inc(gs->current_variable_id);
/*__private*/ struct ad_entry e;
e.coeff[0] = (struct ad_pair){.dx = b, .id = a.id};
e.size = 1;
ret.id = var_id;
e.id = var_id;
//barrier(CLK_LOCAL_MEM_FENCE);
gs->gradient_stack[current] = e;
}
return ret;
}
/**
* Multiplies double a and variable b.If the gradient structure is recording,
* entries will be added, otherwise the result is only computed.
*
* @param gs
* @param a
* @param b
* @return
*/
inline const struct ad_variable ad_times_dv(struct ad_gradient_structure* gs, double a, struct ad_variable b) {
struct ad_variable ret = {.value = a * b.value, .id = 0};
if (gs->recording == 1) {
int current = atomic_inc(gs->stack_current);
int var_id = atomic_inc(gs->current_variable_id);
/*__private*/ struct ad_entry e;
e.coeff[0] = (struct ad_pair){.dx = a, .id = b.id};
e.size = 1;
e.id = var_id;
ret.id = var_id;
//barrier(CLK_LOCAL_MEM_FENCE);
gs->gradient_stack[current] = e;
}
return ret;
}
/**
* Divides variable a by variable b.If the gradient structure is recording,
* entries will be added, otherwise the result is only computed.
*
* @param gs
* @param a
* @param b
* @return
*/
inline const struct ad_variable ad_divide(struct ad_gradient_structure* gs, struct ad_variable a, struct ad_variable b) {
struct ad_variable ret = {.value = a.value / b.value, .id = 0};
if (gs->recording == 1) {
int current = atomic_inc(gs->stack_current);
int var_id = atomic_inc(gs->current_variable_id);
/*__private*/ struct ad_entry e;
double inv = 1.0 / b.value;
e.coeff[0] = (struct ad_pair){.dx = inv, .id = a.id};
e.coeff[1] = (struct ad_pair){.dx = -1.0 * ret.value * inv, .id = b.id};
e.size = 2;
e.id = var_id;
ret.id = var_id;
//barrier(CLK_LOCAL_MEM_FENCE);
gs->gradient_stack[current] = e;
}
return ret;
}
/**
* Divides variable a by double b. If the gradient structure is recording,
* entries will be added, otherwise the result is only computed.
* @param gs
* @param a
* @param b
* @return
*/
inline const struct ad_variable ad_divide_vd(struct ad_gradient_structure* gs, struct ad_variable a, double b) {
struct ad_variable ret = {.value = a.value / b, .id = gs->current_variable_id++};
if (gs->recording == 1) {
int current = atomic_inc(gs->stack_current);
int var_id = atomic_inc(gs->current_variable_id);
/*__private*/ struct ad_entry e;
double inv = 1.0 / b;
e.coeff[0] = (struct ad_pair){.dx = inv, .id = a.id};
e.size = 1;
e.id = var_id;
ret.id = var_id;
//barrier(CLK_LOCAL_MEM_FENCE);
gs->gradient_stack[current] = e;
}
return ret;
}
/**
* Divides double a by variable b. If the gradient structure is recording,
* entries will be added, otherwise the result is only computed.
* @param gs
* @param a
* @param b
* @return
*/
inline const struct ad_variable ad_divide_dv(struct ad_gradient_structure* gs, double a, struct ad_variable b) {
struct ad_variable ret = {.value = a / b.value, .id = 0};
if (gs->recording == 1) {
int current = atomic_inc(gs->stack_current);
int var_id = atomic_inc(gs->current_variable_id);
/*__private*/ struct ad_entry e;
double inv = 1.0 / b.value;
e.coeff[0] = (struct ad_pair){.dx = -1.0 * ret.value * inv, .id = b.id};
e.size = 1;
e.id = var_id;
ret.id = var_id;
//barrier(CLK_LOCAL_MEM_FENCE);
gs->gradient_stack[current] = e;
}
return ret;
}
inline const struct ad_variable ad_cos(struct ad_gradient_structure* gs, struct ad_variable v) {
struct ad_variable ret = {.value = log(v.value), .id = 0};
if (gs->recording == 1) {
int current = atomic_inc(gs->stack_current);
int var_id = atomic_inc(gs->current_variable_id);
/*__private*/ struct ad_entry e;
// double inv = 1.0 / v.value;
e.coeff[0] = (struct ad_pair){.dx = -1.0 * sin(v.value), .id = v.id};
e.size = 1;
e.id = var_id;
ret.id = var_id;
//barrier(CLK_LOCAL_MEM_FENCE);
gs->gradient_stack[current] = e;
}
return ret;
}
inline const struct ad_variable ad_sin(struct ad_gradient_structure* gs, struct ad_variable v) {
struct ad_variable ret = {.value = sin(v.value), .id = 0};
if (gs->recording == 1) {
int current = atomic_inc(gs->stack_current);
int var_id = atomic_inc(gs->current_variable_id);
/*__private*/ struct ad_entry e;
// double inv = 1.0 / v.value;
e.coeff[0] = (struct ad_pair){.dx = cos(v.value), .id = v.id};
e.size = 1;
e.id = var_id;
ret.id = var_id;
//barrier(CLK_LOCAL_MEM_FENCE);
gs->gradient_stack[current] = e;
}
return ret;
}
inline const struct ad_variable ad_tan(struct ad_gradient_structure* gs, struct ad_variable v) {
struct ad_variable ret = {.value = tan(v.value), .id = 0};
if (gs->recording == 1) {
int current = atomic_inc(gs->stack_current);
int var_id = atomic_inc(gs->current_variable_id);
/*__private*/ struct ad_entry e;
double temp = 1.0 / cos(v.value);
e.coeff[0] = (struct ad_pair){.dx = temp*temp, .id = v.id};
e.size = 1;
e.id = var_id;
ret.id = var_id;
//barrier(CLK_LOCAL_MEM_FENCE);
gs->gradient_stack[current] = e;
}
return ret;
}
inline const struct ad_variable ad_acos(struct ad_gradient_structure* gs, struct ad_variable v) {
struct ad_variable ret = {.value = acos(v.value), .id = 0};
if (gs->recording == 1) {
int current = atomic_inc(gs->stack_current);
int var_id = atomic_inc(gs->current_variable_id);
/*__private*/ struct ad_entry e;
double temp = (-1.0) /
pow(((1.0) -
pow(v.value, (2.0))),
(0.5));
e.coeff[0] = (struct ad_pair){.dx = temp, .id = v.id};
e.size = 1;
e.id = var_id;
ret.id = var_id;
//barrier(CLK_LOCAL_MEM_FENCE);
gs->gradient_stack[current] = e;
}
return ret;
}
inline const struct ad_variable ad_asin(struct ad_gradient_structure* gs, struct ad_variable v) {
struct ad_variable ret = {.value = asin(v.value), .id = 0};
if (gs->recording == 1) {
int current = atomic_inc(gs->stack_current);
int var_id = atomic_inc(gs->current_variable_id);
/*__private*/ struct ad_entry e;
double temp = (1.0) /
pow(((1.0) -
pow(v.value, (2.0))),
(0.5));
e.coeff[0] = (struct ad_pair){.dx = temp, .id = v.id};
e.size = 1;
e.id = var_id;
ret.id = var_id;
//barrier(CLK_LOCAL_MEM_FENCE);
gs->gradient_stack[current] = e;
}
return ret;
}
inline const struct ad_variable ad_atan(struct ad_gradient_structure* gs, struct ad_variable v) {
struct ad_variable ret = {.value = atan(v.value), .id = 0};
if (gs->recording == 1) {
int current = atomic_inc(gs->stack_current);
int var_id = atomic_inc(gs->current_variable_id);
/*__private*/ struct ad_entry e;
double temp = (1.0) / (v.value * v.value + (1.0));
e.coeff[0] = (struct ad_pair){.dx = temp, .id = v.id};
e.size = 1;
e.id = var_id;
ret.id = var_id;
//barrier(CLK_LOCAL_MEM_FENCE);
gs->gradient_stack[current] = e;
}
return ret;
}
inline const struct ad_variable ad_cosh(struct ad_gradient_structure* gs, struct ad_variable v) {
struct ad_variable ret = {.value = cosh(v.value), .id = 0};
if (gs->recording == 1) {
int current = atomic_inc(gs->stack_current);
int var_id = atomic_inc(gs->current_variable_id);
/*__private*/ struct ad_entry e;
e.coeff[0] = (struct ad_pair){.dx = sinh(v.value), .id = v.id};
e.size = 1;
e.id = var_id;
ret.id = var_id;
//barrier(CLK_LOCAL_MEM_FENCE);
gs->gradient_stack[current] = e;
}
return ret;
}
inline const struct ad_variable ad_sinh(struct ad_gradient_structure* gs, struct ad_variable v) {
struct ad_variable ret = {.value = sinh(v.value), .id = 0};
if (gs->recording == 1) {
int current = atomic_inc(gs->stack_current);
int var_id = atomic_inc(gs->current_variable_id);
/*__private*/ struct ad_entry e;
e.coeff[0] = (struct ad_pair){.dx = cosh(v.value), .id = v.id};
e.size = 1;
e.id = var_id;
ret.id = var_id;
//barrier(CLK_LOCAL_MEM_FENCE);
gs->gradient_stack[current] = e;
}
return ret;
}
inline const struct ad_variable ad_tanh(struct ad_gradient_structure* gs, struct ad_variable v) {
struct ad_variable ret = {.value = tanh(v.value), .id = 0};
if (gs->recording == 1) {
int current = atomic_inc(gs->stack_current);
int var_id = atomic_inc(gs->current_variable_id);
/*__private*/ struct ad_entry e;
double temp = (1.0 / cosh(v.value))*(1.0 / cosh(v.value));
e.coeff[0] = (struct ad_pair){.dx = temp, .id = v.id};
e.size = 1;
e.id = var_id;
ret.id = var_id;
//barrier(CLK_LOCAL_MEM_FENCE);
gs->gradient_stack[current] = e;
}
return ret;
}
inline const struct ad_variable ad_exp(struct ad_gradient_structure* gs, struct ad_variable v) {
struct ad_variable ret = {.value = exp(v.value), .id = 0};
if (gs->recording == 1) {
int current = atomic_inc(gs->stack_current);
int var_id = atomic_inc(gs->current_variable_id);
/*__private*/ struct ad_entry e;
e.coeff[0] = (struct ad_pair){.dx = ret.value, .id = v.id};
e.size = 1;
e.id = var_id;
ret.id = var_id;
//barrier(CLK_LOCAL_MEM_FENCE);
gs->gradient_stack[current] = e;
}
return ret;
}
inline const struct ad_variable ad_log(struct ad_gradient_structure* gs, struct ad_variable v) {
struct ad_variable ret = {.value = log(v.value), .id = 0};
if (gs->recording == 1) {
int current = atomic_inc(gs->stack_current);
int var_id = atomic_inc(gs->current_variable_id);
/*__private*/ struct ad_entry e;
double inv = 1.0 / v.value;
e.coeff[0] = (struct ad_pair){.dx = 1.0 / v.value, .id = v.id};
e.size = 1;
e.id = var_id;
ret.id = var_id;
//barrier(CLK_LOCAL_MEM_FENCE);
gs->gradient_stack[current] = e;
}
return ret;
}
inline const struct ad_variable ad_log10(struct ad_gradient_structure* gs, struct ad_variable v) {
struct ad_variable ret = {.value = log10(v.value), .id = 0};
if (gs->recording == 1) {
int current = atomic_inc(gs->stack_current);
int var_id = atomic_inc(gs->current_variable_id);
/*__private*/ struct ad_entry e;
double inv = 1.0 / (v.value * 2.30258509299404590109361379290930926799774169921875);
e.coeff[0] = (struct ad_pair){.dx = inv, .id = v.id};
e.size = 1;
e.id = var_id;
ret.id = var_id;
//barrier(CLK_LOCAL_MEM_FENCE);
gs->gradient_stack[current] = e;
}
return ret;
}
inline const struct ad_variable ad_pow(struct ad_gradient_structure* gs,
struct ad_variable a, struct ad_variable b) {
struct ad_variable ret = {.value = pow(a.value, b.value), .id = 0};
if (gs->recording == 1) {
int current = atomic_inc(gs->stack_current);
int var_id = atomic_inc(gs->current_variable_id);
/*__private*/ struct ad_entry e;
double inv = b.value * pow(a.value, b.value - (1.0));
e.coeff[0] = (struct ad_pair){.dx = inv, .id = a.id};
e.coeff[1] = (struct ad_pair){.dx = log(a.value) * ret.value, .id = b.id};
e.size = 2;
e.id = var_id;
ret.id = var_id;
//barrier(CLK_LOCAL_MEM_FENCE);
gs->gradient_stack[current] = e;
}
return ret;
}
inline const struct ad_variable ad_pow_vd(struct ad_gradient_structure* gs,
struct ad_variable a, double b) {
struct ad_variable ret = {.value = pow(a.value, b), .id = 0};
if (gs->recording == 1) {
int current = atomic_inc(gs->stack_current);
ret.id = atomic_inc(gs->current_variable_id);
/*__private*/ struct ad_entry e;
double inv = b * pow(a.value, b - (1.0));
e.coeff[0] = (struct ad_pair){.dx = inv, .id = a.id};
e.size = 1;
e.id = ret.id;
// ret.id = var_id;
//barrier(CLK_LOCAL_MEM_FENCE);
gs->gradient_stack[current] = e;
}
return ret;
}
inline const struct ad_variable ad_pow_dv(struct ad_gradient_structure* gs,
double a, struct ad_variable b) {
struct ad_variable ret = {.value = pow(a, b.value), .id = 0};
if (gs->recording == 1) {
int current = atomic_inc(gs->stack_current);
int var_id = atomic_inc(gs->current_variable_id);
/*__private*/ struct ad_entry e;
double inv = b.value * pow(a, b.value - (1.0));
e.coeff[0] = (struct ad_pair){.dx = log(a) * ret.value, .id = b.id};
e.size = 1;
e.id = var_id;
ret.id = var_id;
//barrier(CLK_LOCAL_MEM_FENCE);
gs->gradient_stack[current] = e;
}
return ret;
}
inline const struct ad_variable ad_sqrt(struct ad_gradient_structure* gs, struct ad_variable v) {
struct ad_variable ret = {.value = sqrt(v.value), .id = 0};
if (gs->recording == 1) {
int current = atomic_inc(gs->stack_current);
int var_id = atomic_inc(gs->current_variable_id);
/*__private*/ struct ad_entry e;
double inv = .5 / ret.value;
e.coeff[0] = (struct ad_pair){.dx = inv, .id = v.id};
e.size = 1;
e.id = var_id;
ret.id = var_id;
//barrier(CLK_LOCAL_MEM_FENCE);
gs->gradient_stack[current] = e;
}
return ret;
}
struct ad_entry* create_entries(int size) {
struct ad_entry* e = (struct ad_entry*) malloc(size * sizeof (ad_entry));
for (int i = 0; i < size; i++) {
e[i].id = 0;
e[i].size = 0;
}
return e;
}
double* compute_gradient(struct ad_gradient_structure& gs, int& size) {
double* gradient = NULL;
if (gs.recording == 1) {
gradient = (double*)malloc(sizeof (double)*(gs.current_variable_id + 1));
size = gs.current_variable_id + 1;
memset(gradient, 0, size * sizeof (double));
// for (int i = 0; i < size; i++) {
// gradient[i] = 0;
// }
gradient[gs.gradient_stack[gs.stack_current - 1].id] = 1.0;
for (int j = gs.stack_current - 1; j >= 0; j--) {
int id = gs.gradient_stack[j].id;
double w = gradient[id];
// if (w != 0.0) {
gradient[id] = 0.0;
for (int i = 0; i < gs.gradient_stack[j].size; i++) {
//std::cout<<gs.gradient_stack[j].coeff[i].id<<"+="<<w<<"*"<<gs.gradient_stack[j].coeff[i].dx<<std::endl;
gradient[gs.gradient_stack[j].coeff[i].id] += w * gs.gradient_stack[j].coeff[i].dx;
}
// }
}
}
// exit(0);
return gradient;
}
#ifdef __cplusplus
}
#endif
#endif /* ADCL_H */