Abstract: This specification describes technologies relating to identifying nearest neighbors are provided. In one implementation, a method includes using a first and a second collections of n-grams and their associated probabilities to generate a plurality of randomized ranked collections of n-grams of each of the first natural language and the second natural language, each ranked collection of n-grams of the plurality of randomized ranked collection of n-grams having an ordering of n-grams according to a rarity of the n-grams in the respective first collection and the second collection of n-grams; using each of the plurality of ranked collections of n-grams to determine a plurality of signatures, each signature corresponding to a text of a collection of texts; and using the plurality of signatures to identify candidate text pairs within the collection of texts including a plurality of texts in the first and the second natural languages.

Abstract: A technique includes providing a collection of documents in multiple languages, identifying, from the collection of documents, a group of candidate documents, where each candidate document in the group shares multiple corresponding rare features, evaluating pairs of candidate documents in the group using multiple common features present in the collection of documents, and determining, based on evaluating the pairs of candidate documents, whether each pair of candidate documents corresponds to a translated pair of documents.