generatecodematrix.m

一款数据挖掘的软件

% GenerateCodeMatrix: generate the coding matrix for multi-class classficiation
%
% Parameters:
% type: type of coding matricies, 0: one-against-all, 1: pairwise, 2:
% ECOC-15, 3: ECOC-63, 4: Random
% num_class: number of classes
% class_set: set of class labels such as [1,-1], the first one is the
% positive label

function coding_matrix = GenerateCodeMatrix(type, num_class, class_set)

switch (type)
case 0
    % one-against-all matrix
    coding_matrix = 2 * diag(ones(1, num_class)) - ones(num_class, num_class); 
case 1   
    coding_matrix = zeros(num_class, (num_class * (num_class - 1) / 2));
    index = 1;
    for i = 1:num_class-1
        for j = i+1:num_class
            coding_matrix(i, index) = 1;
            coding_matrix(j, index) = -1;        
            index = index + 1;
        end;
    end;
case 2
    [Pg, Pm, CS, H, T] = BCHPOLY(15, 5);
    coding_matrix = H(1:num_class, :);
    coding_matrix = 2 * coding_matrix - 1; % convert the element 0 to -1
case 3
    [Pg, Pm, CS, H, T] = BCHPOLY(63, 31);
    coding_matrix = H(1:num_class, 1:15);
    coding_matrix = 2 * coding_matrix - 1; % convert the element 0 to -1    
case 4
    coding_matrix = [ ...
        1  1  1  1 -1  1 -1 -1  1 -1 -1 -1  1 -1 -1  1 -1 -1 -1 -1; ...
        1 -1 -1 -1 -1  1  1 -1  1  1 -1 -1  1  1 -1  1 -1  1  1 -1; ...
        1 -1  1  1 -1  1  1 -1  1  1 -1  1  1  1  1 -1  1 -1 -1  1; ...
        -1  1  1  1 -1 -1 -1  1  1 -1  1  1 -1  1 -1  1 -1 -1 -1  1; ...
        1 -1  1  1 -1 -1  1 -1  1 -1  1  1  1  1 -1 -1 -1  1 -1 -1; ...
        -1 -1  1 -1  1 -1 -1  1 -1 -1  1  1  1 -1  1  1  1 -1 -1 -1; ...
        -1 -1 -1 -1 -1 -1  1 -1 -1  1 -1 -1  1  1  1 -1  1  1 -1 -1; ...
        1  1 -1 -1 -1  1 -1  1  1  1 -1 -1  1  1 -1  1 -1  1  1 -1; ...
        1 -1  1 -1  1 -1  1  1  1 -1 -1 -1  1 -1  1 -1  1  1 -1 -1; ...
        1  1 -1 -1 -1  1  1 -1  1  1  1 -1  1 -1 -1  1 -1 -1  1 -1; ...
        -1  1  1 -1  1 -1  1 -1 -1  1  1  1 -1  1  1  1  1  1 -1 -1; ...
        1  1 -1 -1 -1  1 -1  1  1  1  1 -1 -1 -1  1 -1 -1 -1 -1  1; ...
        1  1 -1 -1  1 -1  1 -1 -1  1  1  1  1  1 -1 -1 -1 -1  1 -1; ...
        -1  1  1  1  1  1  1 -1  1 -1  1  1 -1 -1  1  1 -1  1 -1 -1; ...
        -1  1 -1 -1  1 -1 -1 -1  1 -1 -1  1  1 -1  1  1  1 -1  1  1; ...
        1  1 -1  1  1  1 -1 -1  1  1  1 -1  1  1 -1 -1 -1  1 -1  1; ...
        1  1  1  1 -1 -1 -1  1  1 -1  1 -1  1  1  1  1  1 -1  1 -1; ...
        -1  1 -1  1 -1  1  1  1  1 -1 -1  1 -1 -1 -1 -1 -1 -1 -1 -1; ...
        1  1 -1 -1 -1 -1  1 -1 -1  1 -1 -1 -1  1  1  1 -1  1 -1  1; ...
        -1  1 -1 -1  1  1 -1 -1 -1  1 -1  1 -1  1  1  1  1  1  1  1; ...
        -1 -1 -1 -1  1 -1 -1 -1 -1 -1 -1 -1 -1  1 -1  1  1  1 -1  1; ...
        1  1 -1  1  1 -1  1 -1  1 -1 -1 -1  1  1  1  1  1  1  1  1; ...
        -1 -1  1 -1 -1 -1 -1  1 -1  1 -1  1 -1  1  1 -1  1 -1 -1  1; ...
        1  1 -1 -1 -1  1  1  1  1  1  1  1  1  1 -1  1 -1 -1 -1 -1; ...
        -1  1 -1  1 -1  1  1 -1  1 -1 -1 -1  1 -1  1  1 -1 -1  1  1; ...
        -1  1  1  1 -1 -1  1 -1  1 -1  1  1  1  1 -1 -1 -1  1 -1 -1; ...
        -1 -1  1  1  1 -1  1  1  1  1  1  1 -1  1  1 -1  1 -1  1 -1; ...
        1 -1  1 -1  1 -1  1  1 -1  1  1 -1 -1 -1 -1  1  1  1  1 -1; ...
        -1 -1  1 -1  1 -1  1 -1  1 -1  1 -1 -1 -1  1  1  1 -1  1  1; ...
        -1  1 -1 -1 -1 -1 -1  1  1  1  1 -1 -1  1  1  1  1  1 -1  1; ...
        1  1  1 -1 -1  1  1 -1  1  1  1 -1  1 -1  1  1 -1  1  1 -1];
    coding_matrix = coding_matrix(:, 1:num_class);
    coding_matrix = coding_matrix';
end;