1. A method for identifying documents that represent similar information to train a text-to-text application, the method comprising: obtaining a group of documents; determining reduced size versions of the documents, wherein the reduced size versions summarize information about words contained in the documents and the determining is performed by a processor; changing an order of information within the reduced size versions; sorting the reduced size versions; comparing the reduced size versions to determine documents that represent similar information, wherein the comparing is performed by a processor; and using the documents that represent similar information for training for the text-to-text application.