def?plot_decision_regions(X,?y,?classifier,?resolution=0.02):
????marker?=?{'s','x','o','v'}
????colors?=?{'red','blue','lightgreen','gray','cyan'}
????cmap?=?ListedColormap(colors[:len(numpy.unique(y))])

????x1_min,x1_max?=?X[:,0].min()?-?1,?X[:,0].max()
????x2_min,x2_max?=?X[:,1].min()?-?1,?X[:,1].max()

????print(x1_min,x1_max)
????print(x2_min,x2_max)


plot_decision_regions(X,?y,?ppn,?resolution=0.02)

Traceback (most recent call last):

? File "E:/python/pythonproject/robot_learning/test.py", line 100, in <module>

? ? plot_decision_regions(X, y, ppn, resolution=0.02)

NameError: name 'X' is not defined