菜菜SVM的核函数kernel及案例分析

     XX, YY = np.mgrid[x_min:x_max:200j, y_min:y_max:200j]
   # np.c_，类似于np.vstack的功能，画网格
 Z = clf.decision_function(np.c_[XX.ravel(), YY.ravel()]).reshape(XX.shape)#ravel降维
   # 填充等高线不同区域的颜色
 ax.pcolormesh(XX, YY, Z > 0, shading='auto',cmap=plt.cm.Paired)
   # 绘制等高线
 ax.contour(XX, YY, Z, colors=['k', 'k', 'k'], linestyles=['--', '-', '--'],

出现错误：MatplotlibDeprecationWarning: shading='flat' when X and Y have the same dimensions as C is deprecated since 3.3. Either specify the corners of the quadrilaterals with X and Y, or pass shading='auto', 'nearest' or 'gouraud', or set rcParams['pcolor.shading']. This will become an error two minor releases later.
ax.pcolormesh(XX, YY, Z > 0,cmap=plt.cm.Paired)

将代码ax.pcolormesh(XX, YY, Z > 0, shading='auto',cmap=plt.cm.Paired)改成这个后，仍然无法显示子图

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