I have a doubt in the following code. it is not showing proper plot

from matplotlib.colors import ListedColormap
X_set, y_set=X_train, y_train
X1, X2=np.meshgrid(np.arange(start = X_set[:, 0]. min() -1, stop= X_set[:, 0].max() +1, step=0.01),
np.arange(start = X_set[:, 1]. min() -1, stop= X_set[:, 1].max() +1, step=0.01))
plt.contourf(X1,X2, classifier.predict(np.array([X1.ravel(), X2.ravel()]).T).reshape(X1.shape),
alpha=0.75, cmap=ListedColormap((‘red’, ‘green’)))
plt.xlim(X1.min(), X1.max())
plt.ylim(X2.min(), X2.max())
for i, j in enumerate (np.unique(y_set)):
plt.scatter(X_set[y_set == j, 0], X_set[y_set == j, 1],
c=ListedColormap((‘red’,‘green’))(i), label=j)
plt.title(‘SVM[Training set]’)
plt.xlabel(‘Age’)
plt.ylabel(‘Estimated Salary’)
plt.legend()
plt.show()

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