19. The non-transitory computer-readable medium of claim 18 wherein normalizing the respective similarity scores includes: for each one of the datasets, determining an arithmetic mean of the respective similarity scores for all of the documents in the one of the datasets; for each one of the datasets, generating a respective dataset normalized similarity score for each document of the one of the datasets dependent upon the arithmetic mean of the respective similarity scores for all of the documents of the one of the datasets; and for each one of the documents of each one of the datasets, determining relevance of each one of the documents dependent upon the respective dataset normalized similarity score of each one of the documents of each one of the datasets.
18. The non-transitory computer-readable medium of claim 13 wherein the method further comprises: generating the respective similarity scores for documents from a first dataset and for documents from a second dataset; and normalizing the respective similarity scores of each one of the documents from the first dataset and each one of the documents from the second dataset with respect to all documents of the first and second datasets.