Chinese patent text similarity calculation method

Abstract

The invention relates to a Chinese patent text similarity calculation method. The method comprises the steps of performing word segmentation on texts; calculating TF-IDF values for word segmentation results, extracting the word segmentation results with the relatively high TF-IDF values to serve as keywords, locating sentences where the keywords are located to serve as key sentences, and taking maximum weight values of the keywords in the key sentences as weight values of the key sentences, thereby obtaining a keyword set of each text; and calculating weights of comparison texts of the key sentences, selecting the key sentences of the to-be-compared texts and the comparison texts in sequence, and based on the sentence similarity of the key sentences, calculating the similarity of the texts. By utilizing existing patent domain ontologies, semantic relationships in the patent texts are analyzed; by utilizing a vector space model and the domain ontologies, patent text similarity is calculated; the correct rate and the recall rate of a calculation result are relatively high; the similarity between patents can be described more accurately; the patent examination speed can be increased;and the need of actual application can be well met.

Description

technical field [0001] The invention belongs to the technical field of text information processing, in particular to a method for calculating the similarity of Chinese patent texts. Background technique [0002] In today's Internet era, patents, as a carrier to record human achievements, contain a large number of scientific and technological achievements and innovative technologies. The rapid development of science and technology has led to a sharp increase in the number of patent applications each year. The results returned by the traditional search method by matching the search terms generally use the number of search terms as the relevance of the patent, and do not take into account the semantic information contained in the patent itself. The essence of patent examination is to examine related patents with high patent similarity, among which, the most important point is to calculate the similarity of patent text. Text similarity, the general calculation method is to use...

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Problems solved by technology

The existing method of calculating the similarity of Chinese patent texts has the problem of loss of semantic information, and the calculation of the similarity of Chinese texts in the prior art

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