daxpy_.cpp

最大熵 等模型使用的 lbfgs 训练源代码。

#include <iostream>
#include <stdlib.h>
#include "lbfgs.h"
/* Compute the sum of a vector times a scalar plus another vector.
   Concretely speacking, it computes four relative weights at one time.
*/
void main()
{
	double x[10]={1,2,3,4,5,6,7,8,9,10};
	double y[10]={-1,-2,-3,-4,-5,-6,-7,-8,-9,-10};
	std::cout<<"vector starts at first position and shifts with 1 step length"<<std::endl;
	scitbx::lbfgs::detail::daxpy<double,int>(10,0.1,x,0,y);
	for(int i=0;i<10;++i)
		std::cout<<y[i]<<" ";
	std::cout<<std::endl;
	std::cout<<"vector starts at first position and shifts with 2 step length"<<std::endl;
	scitbx::lbfgs::detail::daxpy<double,int>(5,0.1,x,0,2,y,0,2);
	for(int i=0;i<10;++i)
		std::cout<<y[i]<<" ";
	std::cout<<std::endl;
	std::cout<<"vector starts at third position and shifts with 1 step length"<<std::endl;
	scitbx::lbfgs::detail::daxpy<double,int>(7,0.1,x,3,1,y,3,1);
	for(int i=0;i<10;++i)
		std::cout<<y[i]<<" ";
	std::cout<<std::endl;
}