【BP分类】基于花朵授粉算法优化BP神经网络实现数据分类附matlab代码

本文链接：https://blog.youkuaiyun.com/matlab_dingdang/article/details/125053849

本文介绍了一种结合花朵授粉算法(FPA)优化BP神经网络的方法，以增强其预测准确性。FPA的特点被用于调整神经网络权重和阈值，克服了传统BP的随机性和收敛慢问题。通过实际负荷数据验证了优化效果。

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1 简介

为了提高分类的准确性,降低因预测精度不高带来的电能损失,提出将花朵授粉算法(flower pollination algorithm,FPA)与BP神经网络相结合,利用FPA算法具有收敛速度快,全局搜索能力强的特点,对BP神经网络的权值和阈值进行优化,改善传统BP神经网络因权值和阈值的选择具有随机性而陷入局部最优和收敛速度慢的缺点.最后,通过某地区实际负荷数据验证了优化后的BP神经网络的预测精度得到了提高.

2 部分代码

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%Flower Pollination Algorithm for Multimodal Optimization (MFPA)%Jorge G醠vez, Erik Cuevas and Omar Avalos%%This is the line to execute the code:%%[mem,bestSol,bestFit,optima,FunctionCalls]=FPA([500.255002]);%FitFunc implements the function to be optimized%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%function [mem,bestSol,bestFit,optima,FunctionCalls]=FPA(para)% Default parametersif nargin<1,   para=[50 0.25 500];   endn=para(1);           % Population sizep=para(2);           % Probabibility switchN_iter=para (3);  % Number of iterationsphase = 1; %First statephaseIte= [0.5,0.9,1.01]; %State vector%Deb Functiond = 1;Lb = 0;Ub = 1;optima =  [.1;.3;.5;.7;.9];% Initialize the populationfor i=1:n,  Sol(i,:)=Lb+(Ub-Lb).*rand(1,d);  Fitness(i)=fitFunc(Sol(i,:));  %%Evaluate fitness functionend% Initialice the memory[mem,bestSol,bestFit,worstF] = memUpdate(Sol,Fitness, [], zeros(1,d), 100000000, 0, phase,d,Ub,Lb);S = Sol;FunctionCalls = 0;% Main Loopfor ite = 1 : N_iter,                    %For each pollen gamete, modify each position acoording                    %to local or global pollination                    for i = 1 : n,                                % Switch probability                                if rand>p,                                                                                        L=Levy(d);                                            dS=L.*(Sol(i,:)-bestSol);                                            S(i,:)=Sol(i,:)+dS;                                            S(i,:)=simplebounds(S(i,:),Lb,Ub);                                else                                            epsilon=rand;                                            % Find random flowers in the neighbourhood                                            JK=randperm(n);                                            % As they are random, the first two entries also random                                            % If the flower are the same or similar species, then                                            % they can be pollenated, otherwise, no action.                                            % Formula: x_i^{t+1}+epsilon*(x_j^t-x_k^t)                                            S(i,:)=S(i,:)+epsilon*(Sol(JK(1),:)-Sol(JK(2),:));                                            % Check if the simple limits/bounds are OK                                            S(i,:)=simplebounds(S(i,:),Lb,Ub);                                end                                Fitness(i)=fitFunc(S(i,:));                    end                    %Update the memory                    [mem,bestSol,bestFit,worstF] = memUpdate(S,Fitness,mem,bestSol,bestFit,worstF,phase,d,Ub,Lb);                                       Sol = get_best_nest(S, mem, p);                                      FunctionCalls = FunctionCalls + n;                                   if ite/N_iter > phaseIte(phase)                        %Next evolutionary process stage                        phase = phase + 1;                        [m,~]=size(mem);                        %Depurate the memory for each stage                        mem = cleanMemory(mem);                        FunctionCalls = FunctionCalls + m;                   endend%Plot the solutions (mem) founded by the multimodal frameworkx = 0:.01:1;y = ((sin(5.*pi.*x)).^ 6);plot(x,y)hold onplot(mem(:,1),-mem(:,2),'r*');