Update app.py

app.py

@@ -29,6 +29,8 @@ y_predicted = knn.predict(xy)
 #plt.pcolormesh(y_predicted.reshape(200, 200), cmap='jet')
 plt.pcolormesh(xx, yy, y_predicted.reshape(200, 200), cmap='jet', alpha=0.2)
 y_unique = np.unique(y_train)
+markers = '*x+'
+colors = 'bgr'
 for i in range(len(y_unique)):
   plt.scatter(x_train[y_train == y_unique[i], 0],
                x_train[y_train == y_unique[i], 1],