The question here gives an example of how to use xgboost - a machine learning library written in C++. I want to run the example, and therefore install the library for C++. I added the /lib files to /usr/local/lib and /src files to /usr/local/src
I am able to compile this much part of the example :
#include <iostream>
#include <xgboost/c_api.h>
using namespace std;
int main(){
int cols=3,rows=5;
float train[rows][cols];
for (int i=0;i<rows;i++)
for (int j=0;j<cols;j++)
train[i][j] = (i+1) * (j+1);
float train_labels[rows];
for (int i=0;i<rows;i++)
train_labels[i] = 1+i*i*i;
DMatrixHandle h_train[1];
XGDMatrixCreateFromMat((float *) train, rows, cols, -1, &h_train[0]);
}
However, I am getting a linking error:
/tmp/ccuBacNh.o: In function `main':
TerrainPredict.cpp:(.text+0x278): undefined reference to `XGDMatrixCreateFromMat'
collect2: error: ld returned 1 exit status
How can I resolve this. I concluded that cpp files are missing, but I don't know where to put them. I want help regarding how to proceed with installation.
I also tried using a makefile:
LDLIBSOPTIONS=xgboost/lib/libxgboost.a xgboost/rabit/lib/librabit.a xgboost/dmlc-core/libdmlc.a -lpthread
CFLAGS=-I xgboost/include -I xgboost/rabit/include -I dmlc-core/include
all:
g++ main.cpp $(CFLAGS) $(LDLIBSOPTIONS)
I put Makefile, main.cpp and xgboost directory in the same folder. In that case I am getting a longer linking error. Error is too long to include fully. Here it is.
