| Exception Thrown By: | Cause | |
| Class | Method | |
| CityBlockSimilarity | if either item is known to be non existent in the data. | |
| EuclideanDistanceSimilarity | if either item is known to be non existent in the dataTaste | |
| UncenteredCosineSimilarity | if any item is known to be non existent in the dataTaste | |
