Memory overflow in program run after compilation of C code transformed by the xgboost model #588
Description
`#ifndef linux
#include "stdafx.h"
#endif
#include <math.h>
#include <string.h>
double g_array[2] = { 0.0, 0.0 };
double* make_array(double x, double y)
{
g_array[0] = x;
g_array[1] = y;
return g_array;
}
void score(double * input, double * output) {
double var0;
if ((input[487]) >= (0.5)) {
if ((input[149]) >= (0.5)) {
if ((input[69]) >= (0.5)) {
if ((input[396]) >= (1.5)) {
if ((input[379]) >= (40.5)) {
if ((input[436]) >= (67.5)) {
if ((input[65]) >= (32.5)) {
var0 = -0.4347826;
... ... ... ... ... ...
}
}
}
}
double var55;
var55 = (1.0) / ((1.0) + (exp((0.0) - (((((((((((((((((((((((((((((((((((((((((((((((((((((((var0) + (var1)) + (var2)) + (var3)) + (var4)) + (var5)) + (var6)) + (var7)) + (var8)) + (var9)) + (var10)) + (var11)) + (var12)) + (var13)) + (var14)) + (var15)) + (var16)) + (var17)) + (var18)) + (var19)) + (var20)) + (var21)) + (var22)) + (var23)) + (var24)) + (var25)) + (var26)) + (var27)) + (var28)) + (var29)) + (var30)) + (var31)) + (var32)) + (var33)) + (var34)) + (var35)) + (var36)) + (var37)) + (var38)) + (var39)) + (var40)) + (var41)) + (var42)) + (var43)) + (var44)) + (var45)) + (var46)) + (var47)) + (var48)) + (var49)) + (var50)) + (var51)) + (var52)) + (var53)) + (var54)))));
memcpy(output, make_array((1.0) - (var55), var55), 2 * sizeof(double));
}
`
I converted the xgboost binary classification model to C++ code, compiled it into an exe program, ran it on a large scale dataset and found that the program ran out of memory, the memory usage went up from the initial 30MB to 1.5GB, and then ran out of memory, and after debugging I found that it seems to be this line of code that causes the memory to keep increasing:
memcpy(output, make_array((1.0) - (var55), var55), 2 * sizeof(double));