SHOGUN
4.1.0
首页
相关页面
模块
类
文件
文件列表
文件成员
全部
类
命名空间
文件
函数
变量
类型定义
枚举
枚举值
友元
宏定义
组
页
src
shogun
lib
slep
q1
ep1R.h
浏览该文件的文档.
1
/* This program is free software: you can redistribute it and/or modify
2
* it under the terms of the GNU General Public License as published by
3
* the Free Software Foundation, either version 3 of the License, or
4
* (at your option) any later version.
5
*
6
* This program is distributed in the hope that it will be useful,
7
* but WITHOUT ANY WARRANTY; without even the implied warranty of
8
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
9
* GNU General Public License for more details.
10
*
11
* You should have received a copy of the GNU General Public License
12
* along with this program. If not, see <http://www.gnu.org/licenses/>.
13
*
14
* Copyright (C) 2009 - 2012 Jun Liu and Jieping Ye
15
*/
16
17
#ifndef EP1R_SLEP
18
#define EP1R_SLEP
19
20
#include <
shogun/lib/config.h
>
21
22
#include <stdlib.h>
23
#include <stdio.h>
24
#include <time.h>
25
#include <math.h>
26
27
28
/*
29
Euclidean Projection onto l_{2,1} Ball
30
31
min 1/2 ||x- u||_2^2 + 1/2 ||t- v||_2^2
32
s.t. |x|<=t
33
34
35
Usage:
36
[x, t]=ep1R(u, v, n);
37
38
*/
39
40
41
void
ep1R
(
double
* x,
double
*t,
double
* u,
double
* v,
int
n)
42
{
43
int
j;
44
45
46
for
(j=0;j<n;j++){
47
48
if
(fabs(u[j]) > fabs(v[j])){
49
t[j]=(fabs(u[j]) + v[j])/2;
50
51
if
(u[j] >0)
52
x[j]=t[j];
53
else
54
x[j]=-t[j];
55
}
56
else
57
if
(fabs(u[j]) <= v[j]){
58
t[j]=v[j];
59
x[j]=u[j];
60
}
61
else
{
62
t[j]=x[j]=0;
63
}
64
65
}
66
}
67
#endif
/* ----- #ifndef EP1R_SLEP ----- */
68
config.h
ep1R
void ep1R(double *x, double *t, double *u, double *v, int n)
Definition:
ep1R.h:41
SHOGUN
机器学习工具包 - 项目文档