Description: Firstly,the BP artificial neural network algorithm to predict the GDP and then construct the GM(1,1) model,at last build out the combined model to predict the GDP int the future.
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File list (Check if you may need any files):
新建文件夹\bp2.m
..........\bpt.m
..........\bp_ann.m
..........\bp_gm_c.m
新建文件夹