从哪里设置网站关键词,上杭网站建设公司,北京建设网站哪里好,网络推广工具和方法朴素贝叶斯#xff08;Naive Bayes#xff09;是一种基于贝叶斯定理的分类算法#xff0c;它假设特征之间相互独立#xff0c;从而简化了计算复杂性。该算法常用于文本分类、垃圾邮件过滤、情感分析等应用场景。 MATLAB实现鸢尾花数据集分类代码如下#xff1a;
clear
lo…
朴素贝叶斯Naive Bayes是一种基于贝叶斯定理的分类算法它假设特征之间相互独立从而简化了计算复杂性。该算法常用于文本分类、垃圾邮件过滤、情感分析等应用场景。 MATLAB实现鸢尾花数据集分类代码如下
clear
load fisheriris
X meas(:,1:2);
Y species;
labels unique(Y);figure;
gscatter(X(:,1), X(:,2), species,rgb,osd);
xlabel(Sepal length);
ylabel(Sepal width);
mdl fitcnb(X,Y);
[xx1, xx2] meshgrid(4:.01:8,2:.01:4.5);
XGrid [xx1(:) xx2(:)];
[predictedspecies,Posterior,~] predict(mdl,XGrid);sz size(xx1);
s max(Posterior,[],2);
figure
hold on
surf(xx1,xx2,reshape(Posterior(:,1),sz),EdgeColor,none)
surf(xx1,xx2,reshape(Posterior(:,2),sz),EdgeColor,none)
surf(xx1,xx2,reshape(Posterior(:,3),sz),EdgeColor,none)
xlabel(Sepal length);
ylabel(Sepal width);
colorbar
view(2)
hold offfigure(Units,Normalized,Position,[0.25,0.55,0.4,0.35]);
hold on
surf(xx1,xx2,reshape(Posterior(:,1),sz),FaceColor,red,EdgeColor,none)
surf(xx1,xx2,reshape(Posterior(:,2),sz),FaceColor,blue,EdgeColor,none)
surf(xx1,xx2,reshape(Posterior(:,3),sz),FaceColor,green,EdgeColor,none)
xlabel(Sepal length);
ylabel(Sepal width);
zlabel(Probability);
legend(labels)
title(Classification Probability)
alpha(0.2)
view(3)
hold off运行结果如下
