Colour-divided boundary

[abhranildas]

If in a classification scenario, while plotting the boundary for any pair of classes (say red and blue), we use red points for the points evaluated from the red dist, and blue points for the points evaluated from the blue. Then the boundary will be a mixture of red and blue.
Boundary between blue and green will then be a mixture of blue and green points.
May be helpful to visualize multi-class.
Drawback: if the points are dense, only the ones plotted later will show.

[abhranildas]

Not possible, later boundaries plot on top of earlier boundaries. Greatly reducing the number of points doesn't help, but makes boundaries sparse.