%%?Use_precomputed_kernelForLibsvm_example
%?faruto
%?last?modified?by?2011.07.07
%%
tic;
clear;
clc;
close?all;
format?compact;
%%
load?heart_scale.mat;
%?Split?Data
train_data?=?heart_scale_inst（1:150:）;
train_label?=?heart_scale_label（1:150:）;
test_data?=?heart_scale_inst（151:270:）;
test_label?=?heart_scale_label（151:270:）;

%%?Linear?Kernel
model_linear?=?svmtrain（train_label?train_data?‘-t?0‘）;
[predict_label_L?accuracy_L?dec_values_L]?=?svmpredict（test_label?test_data?model_linear）;

%%?Precomputed?Kernel?One
%?使用的核函數(shù)?K（xx‘）?=?（x?*?x‘）
%?核矩陣
ktrain1?=?train_data*train_data‘;
Ktrain1?=?[（1:150）‘ktrain1];
model_precomputed1?=?svmtrain（train_label?Ktrain1?‘-t?4‘）;
ktest1?=?test_data*train_data‘;
Ktest1?=?[（1:120）‘?ktest1];
[predict_label_P1?accuracy_P1?dec_values_P1]?=?svmpredict（test_label?Ktest1?model_precomputed1）;

%%?Precomputed?Kernel?Two
%?使用的核函數(shù)?K（xx‘）?=?||x||?*?||x‘||
%?核矩陣
ktrain2?=?ones（150150）;
for?i?=?1:150
????for?j?=?1:150
????????ktrain2（ij）?=?sum（train_data（i:）.^2）^0.5?*?sum（train_data（j:）.^2）^0.5;
????end
end
Ktrain2?=?[（1:150）‘ktrain2];
model_precomputed2?=?svmtrain（train_label?Ktrain2?‘-t?4‘）;

ktest2?=?ones（120150）;
for?i?=?1:120
????for?j?=?1:150
????????ktest2（ij）?=?sum（test_data（i:）.^2）^0.5?*?sum（train_data（j:）.^2）^0.5;
????end
end
Ktest2?=?[（1:120）‘?ktest2];
[predict_label_P2?accuracy_P2?dec_values_P2]?=?svmpredict（test_label?Ktest2?model_precomputed2）;
%%?Precomputed?Kernel?Three
%?使用的核函數(shù)?K（xx‘）?=?（x?*?x‘）?/?||x||?*?||x‘||
%?核矩陣
ktrain3?=?ones（150150）;
for?i?=?1:150
????for?j?=?1:150
????????ktrain3（ij）?=?...
????????train_data（i:）*train_data（j:）‘/（sum（train_data（i:）.^2）^0.5?*?sum（train_data（j:）.^2）^0.5）;
????end
end
Ktrain3?=?[（1:150）‘ktrain3];
model_precomputed3?=?svmtrain（train_label?Ktrain3?‘-t?4‘）;

ktest3?=?ones（120150）;
for?i?=?1:120
????for?j?=?1:150
????????ktest3（ij）?=?...
????????test_data（i:）*train_data（j:）‘/（sum（test_data（i:）.^2）^0.5?*?sum（train_data（j:）.^2）^0.5）;
????end
end
Ktest3?=?[（1:120）‘?ktest3];
[predict_label_P3?accuracy_P3?dec_values_P3]?=?svmpredict（test_label?Ktest3?model_precomputed3）;


%%?Display?the?accuracy
accuracyL?=?accuracy_L（1）?%?Display?the?accuracy?using?linear?kernel
accuracyP1?=?accuracy_P1（1）?%?Display?the?accuracy?using?precomputed?kernel?One
accuracyP2?=?accuracy_P2（1）?%?Display?the?accuracy?using?precomputed?kernel?Two
accuracyP3?=?accuracy_P3（1）?%?Display?the?accuracy?using?precomputed?kernel?Three
%%
toc;

?屬性????????????大小?????日期????時間???名稱
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?????文件????1198359??2011-07-07?14:18??Libsvm參數(shù)實例詳解（《Learn?SVM?Step?by?Step》by?faruto2011系列視頻-應用篇）.pdf

?????文件???????2587??2011-07-07?13:21??Use_precomputed_kernelForLibsvm_example.m

?????文件????????811??2011-07-07?14:09??wiAndv_example.m

-----------?---------??----------?-----??----

??????????????1201757????????????????????3