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classifiers=cell(1,num_class);
for i=1:num_class
    disp(['Training classifier:',num2str(i),'/',num2str(num_class)]);
    training_instance_matrix=train_data;
   
    training_label_vector=train_target(i,';
    tmp_model=svmtrain(training_label_vector,training_instance_matrix,str);
    classifiers{1,i}.model=tmp_model;
end

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