10. The method of claim 7 , further comprising: prior to the clustering of the images sharing the particular label, dividing the images sharing the particular label into a set of hard instances and a set of easy instances, each set having a size.
10. The method of claim 7 , further comprising: prior to the clustering of the images sharing the particular label, dividing the images sharing the particular label into a set of hard instances and a set of easy instances, each set having a size. 11. The method of claim 10 , wherein the size of the set of hard instances is a predefined percentage of a count of the images sharing the particular label.