Blah.py

def _overlaps(match1, match2):
    bbox_tl1, bbox_br1, _, _ = match1
    bbox_tl2, bbox_br2, _, _ = match2
    return (bbox_br1[0] > bbox_tl2[0] and
            bbox_br2[0] > bbox_tl1[0] and
            bbox_br1[1] > bbox_tl2[1] and
            bbox_br2[1] > bbox_tl1[1])


def _group_overlapping_rectangles(matches):
    matches = list(matches)
    num_groups = 0
    match_to_group = {}
    for idx1 in range(len(matches)):
        for idx2 in range(idx1):
            if _overlaps(matches[idx1], matches[idx2]):
                match_to_group[idx1] = match_to_group[idx2]
                break
        else:
            match_to_group[idx1] = num_groups
            num_groups += 1

    groups = collections.defaultdict(list)
    for idx, group in match_to_group.items():
        groups[group].append(matches[idx])

    return groups