Nippon Telegraph and Telephone Corporation

Katsuji Bessho

Hisako Asano

Junji Tomita

Kyosuke Nishida

Atsushi Otsuka

Yoshihiro Matsuo

Shigehito Iwase

To arrange all words so that the distance of a given word pair will be appropriate. Using as input a concept basewhich is a set of pairs of a word and a vector representing a concept of the word, and a dictionarywhich is a set of semantically distant or close word pairs, when a word pair C being a pair of given words A, B in the concept baseis present in the dictionary, conversion meansassociates with the word pair C a magnitude D of a difference vector between a difference vector V' between a converted vector of the word A and a converted vector of the word B, and a vector kV determined by multiplying a difference vector V between the vector of the word A in the concept baseand the vector of the word B in the concept baseby a scalar value k. When the word pair C is not present in the dictionary, the conversion meansassociates the magnitude D of the difference vector between the difference vector V&#x2032; and the difference vector V with the word pair C. The conversion meansconverts the vector of a given word in the concept basesuch that a total sum of the magnitude D corresponding to every word pair C is minimized.

Word vector changing device, method, and program

Taking as input a group of text pairs for learning in which each pair is constituted with a first text for learning and a second text for learning that serves as an answer when a question is made with the first text for learning, a query expansion model is learned so as to generate a text serving as an expanded query for a text serving as a query.

Model generation device, text search device, model generation method, text search method, data structure, and program

A method for performing a semantic analysis process on a computer system including a storage unit and an interface includes the steps of: receiving a syntactic tree generated from a natural language sentence text; determining whether an analysis object, which is one of nodes of the syntactic tree, is a verb phrase class which has a verb as a head or a non-verb phrase class which has mainly a noun as the head on the basis of subdivided type information of a phrase of the node with reference to first data stored in the storage unit; analyzing a relation between a verb in the analysis object and a deep case of the verb when the analysis object is the verb phrase class; analyzing a modificative relation in the analysis object when the analysis object is the non-verb phrase class; generating a semantic structure of the natural language sentence text wherein the semantic structure comprises semantic frames corresponding to nodes of the syntactic tree, at least two semantic frames of the semantic frames being linked by a head relation or a deep case relation or a modificative relation, and storing the semantic structure in the storage unit or displaying the semantic structure on a display which is connectable to the computer system via the interface.

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Yokosuka, Japan

Katsuji Bessho