sclass ImageBuckets {
  float similarityThreshold = 0.99f;
  new LL<RGBImage> buckets;
  new Map<Int> duplicates;
  int images, totalDuplicates;
  
  void addImage(RGBImage pat) {
    new Best<Int> best;
    for i over buckets: {
      Pair<RGBImage, Float> p = rgbMostSimilarImage(pat, buckets.get(i), 0);
      best.put(i, p.b);
      if (p.b == 1) { // it's a duplicate
        ++images;
        ++totalDuplicates;
        duplicates.put(i, toInt(duplicates.get(i))+1);
        ret;
      }
    }
    ++images;
    if (best.score() < similarityThreshold)
      buckets.add(ll(pat)); // new bucket
    else
      buckets.get(best!).add(pat);
  }
}

Began life as a copy of #1020130