function cls_PlotConfusionMatrix(M)
%normalize each row by its column
sum_cols = repmat(sum(M, 1), size(M, 1), 1);
Mc = M ./ sum_cols;
subplot(2, 1, 1),
bar(Mc');
sum_rows = repmat(sum(M, 2), 1, size(M, 2));
Mr = M ./ sum_rows;
subplot(2, 1, 2),
bar(Mr);
