Figure 6

Derivation of contours for set S _i . The darkness of a tile represents the value of the neurons’ i-th component, the thick black line is the contour, dots represent items that are in S _i , and white dots are items that are not in S _i . (a) Contour that results from the union of tiles with a value above a certain threshold. (b) Refined contour with shortcuts across free tiles.