基于關(guān)系代數(shù)的語(yǔ)法—語(yǔ)義分析單元設(shè)計(jì)
[Abstract]:Syntactic analysis is one of the important components of structural pattern recognition system. Traditionally, however, syntactic parsing units are implemented by writing specific procedural language codes. When the scale of grammar recognition in application field is very large, it is not easy to write a program that can recognize samples quickly. This paper attempts to integrate the syntactic parsing algorithm with the relational algebra model, and make use of the characteristics of the relational database system to organize and quickly retrieve the massive data, so as to enhance the ability of the syntactic analysis unit to deal with complex grammar samples. At the same time reduce the user's coding burden. We gave Earley (?) The extended relational model of the algorithm is analyzed by the method. In this framework, any set of partial derivation trees can be represented as a relation in relational algebra, the operations between partial derivation trees can be represented as relational algebraic operations, and the syntax analysis algorithm can be represented as a recursive query statement. The operation process described by the procedure language has corresponding relations with the query of recursive query in three aspects: single operation, control structure and data structure. According to this framework, we present a new Earley syntax parsing relational algebra algorithm, and the realization of common table expression (CTE) and stored procedure. The feasibility of the method is verified by the prototype system. Attribute grammar has both the characteristics of decision theory and structural method, so it has been paid more and more attention in the field of pattern recognition. Therefore, this paper attempts to extend the relational algebraic approach to the semantic analysis of attribute grammars, and presents a Earley Synthetical attribute Grammar guidance Translation algorithm based on relational algebra. It is applied to a basic comprehensive attribute evaluation problem, the arithmetic expression evaluation problem. The algorithm can calculate the expression value while reading the result of the expression lexical analysis. The feasibility of the method is verified. These corresponding relations between Earley parsing algorithm and relational database are known, which can be fully or partially utilized in future algorithm design. The syntactic parsing problem is transformed into database query problem in whole or in part selectively, and the ability of syntactic analysis unit to deal with complex grammar samples is enhanced by using the advantage of relational database system to deal with massive data. In addition, with the help of the extended relational algebraic operation presented in this paper, it is easy to express the relationship between the parse items or partial derivation trees produced in the operation of the Earley parsing algorithm. Theoretically, because these corresponding relations are known, it is possible to draw inspiration from another domain for some problems in one domain by analogy. For example, by comparing the two, we can find the reason why the algorithms described in the procedure language are more efficient in some aspects than query execution. These are undoubtedly database query processing can be used for reference.
【學(xué)位授予單位】:大連交通大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2012
【分類號(hào)】:H043
【共引文獻(xiàn)】
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