2. The method of claim 1 , wherein in the case that the at least one relevancy criterion includes the topology type, the calculating of the total relevancy score of the projected sample plan further includes: calculating a polygon count for the IC layout, wherein the polygon count includes a total number of shapes for each clip; and calculating an area density for the IC layout, wherein the area density includes a percentage of area in the projected sample plan occupied by polygons in each clip.
2. The method of claim 1 , wherein in the case that the at least one relevancy criterion includes the topology type, the calculating of the total relevancy score of the projected sample plan further includes: calculating a polygon count for the IC layout, wherein the polygon count includes a total number of shapes for each clip; and calculating an area density for the IC layout, wherein the area density includes a percentage of area in the projected sample plan occupied by polygons in each clip. 3. The method of claim 2 , further comprising grouping each of the plurality of clips into one of a plurality of similarity groups, wherein each group corresponds to a range of polygon counts and area densities.