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Time expression standardization method based on semantic analysis

A semantic analysis and expression technology, applied in semantic analysis, character and pattern recognition, instruments, etc., can solve the problem of lack of standardized definition of Chinese time expressions, and achieve the effect of low labor cost and high accuracy

Pending Publication Date: 2020-07-10
NANJING UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the lack of specific normative definitions for Chinese time expressions, many standardization works are in the exploratory stage

Method used

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  • Time expression standardization method based on semantic analysis
  • Time expression standardization method based on semantic analysis
  • Time expression standardization method based on semantic analysis

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Experimental program
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Effect test

Embodiment

[0052] combine figure 1 , a method for standardizing time expressions based on semantic analysis in the present invention, firstly design a set of related semantic items according to the time expression specification, for the subsequent semantic item allocation and semantic item combination; then use the time expression normalization value of the training set and its benchmark time, exhaustively enumerate all possible semantic combinations and model it as an integer programming problem to solve, and generate the underlying semantic results; finally, apply the obtained underlying semantic results to the time expression of the test set, and automatically Combining to get complete expression semantics, parsing out the final standardized value, specifically includes the following steps:

[0053] Step 1. Design the semantic items in the time expression, including semantic calculation functions and semantic values, as follows:

[0054] According to the TIMEX3 time expression specif...

specific Embodiment

[0079] Step 4.1, judging the time expression type. According to the TIMEX3 specification, time expressions are divided into four categories: date type, time type, time period type, and repeated interval type. The semantic calculation functions of each type are different. For example, time period type time expressions will not use Modify and Offset Semantic computation functions. The present invention uses a support vector machine (SVM) to perform classification learning of types. For the specific example "2 years ago", step 4.1 determines that it belongs to a date-type time expression.

[0080] Step 4.2, delete the illegal semantic calculation function according to the time expression type, and add the default semantic calculation function. Since different types of time expressions have different semantic calculation functions, first delete the illegal semantic calculation function, and if there is a missing semantic calculation function after deletion, then add the default ...

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Abstract

The invention discloses a time expression standardization method based on semantic analysis. The method comprises the following steps: firstly, constructing semantic items in a time expression, wherein the semantic items comprise a semantic calculation function and a semantic value; then, exhausting all possible semantic combinations by using the time expression standardized value marked by the training set and the reference time value of the time expression standardized value; modeling a time expression semantic item allocation problem into an integer programming problem, and completing automatic allocation of bottom-layer semantic items through an optimization algorithm; and finally, automatically combining semantic items by using a heuristic rule, and analyzing the semanteme of the timeexpression to be standardized to obtain a standardized value. According to the method, manual distribution and combination of underlying semantic items are not needed, the labor cost is reduced, andthe flexibility and generalization ability of time expression standardization are improved.

Description

technical field [0001] The invention relates to the technical field of natural language processing, in particular to a method for standardizing time expressions based on semantic analysis. Background technique [0002] With the rapid development of natural language processing, especially in the field of natural language understanding, it is becoming more and more important to understand temporal expressions in natural language. Being able to correctly and effectively understand the meaning of time expressions has greatly improved the results of downstream tasks such as reading comprehension and question answering systems. In order to study time expressions systematically, people divide the research task into two aspects: formulation of time expression norms and identification and standardization of standardized time expressions. [0003] Driven by the demand for time expression understanding, the TIMEX3 specification came into being, and it was publicly published in TempEva...

Claims

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Application Information

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IPC IPC(8): G06F40/30G06K9/62
CPCG06F18/2411G06F18/214
Inventor 高冠吉丁文韬瞿裕忠
Owner NANJING UNIV