DOC fix deprecation warning in plot_separating_hyperplane_unbalanced (scikit-learn#27453)

Author: glemaitre

examples/svm/plot_separating_hyperplane_unbalanced.py

@@ -25,6 +25,7 @@
 
 """
 
+import matplotlib.lines as mlines
 import matplotlib.pyplot as plt
 
 from sklearn import svm
@@ -81,7 +82,10 @@
 )
 
 plt.legend(
-    [disp.surface_.collections[0], wdisp.surface_.collections[0]],
+    [
+        mlines.Line2D([], [], color="k", label="non weighted"),
+        mlines.Line2D([], [], color="r", label="weighted"),
+    ],
     ["non weighted", "weighted"],
     loc="upper right",
 )