(DROP) Data Reduction Algorithm - How it works?
Algorithm 1 takes non-annotated data as input, so it is agnostic to the labels (shapes). In line 1, algorithm 1 computes clusters on the non-annotated data. The cluster assignments do not necessarily correspond exactly to the labels. The output of algorithm 1 will be a set of edges between data in different clusters, but the data need not have different labels. So the reason edges 6 and 7 can connect between triangles is because the triangles have been assigned to different clusters.