Improvement of gene expression programming algorithm and its application in comprehensive evaluation of social benefits:taking the development of ionic rare earth resources in Gannan as an example
Taking the development of ionic rare earth resources in Gannan as an example,this paper explores the construction method of social benefit comprehensive evaluation model,and provides reference for the development of mineral resources.Based on the analysis of national resource security,social economy,people's life and ecological environment,the index system of social benefit comprehensive evaluation of the development of ionic rare earth mineral resources in Gannan is constructed.Considering that gene expression programming(GEP)algorithm has good effectiveness in fitting functions,it can reflect the functional relationship between indicators.Therefore,it is proposed to utilize the GEP algorithm to mine the functional relationship between each index to construct a comprehensive evaluation model of social benefits of rare earth mineral resources development,and to propose a quantification method based on the rate of change for solving the weights of each indicator to objectively evaluate the social benefits of the development of ionic rare earth resources in Gannan.In this case,the function fitting effect of the traditional GEP algorithm is not ideal,and the average relative error is large.Based on this,the mutation operator and IS transposition operator of the traditional GEP algorithm are improved to increase the exploration ability of the algorithm.At the same time,when the evolution of the algorithm stagnates for a long time,"selection of the new"is introduced to generate offspring to increase the population diversity.Experiments show that the improved algorithm is more likely to jump out of the local optimum and can converge quickly.It can obtain a better function fitting effect and reduce the experimental error.The weight of the comprehensive evaluation index system is solved by using the change rate of independent variables and the function relationship obtained by the improved GEP,in which the weights of national resource security degree,impact on social economy,impact on people's life and impact on ecological environment are 0.084,0.243,0.313 and 0.360 respectively.The research results can provide reference for decision makers to make reasonable planning for the development of ionic rare earth resources in Gannan.
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