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⛄ 内容介绍
人工时间的最大缺点是训练太长，因为它在应用神经网络的时间范围内，持续不断地限制神经网络，最大限度地限制学习机（Extreme Learning Machine）大量的噪声噪声，或者当输入数据时的维度算法非常高时，极限学习时的综合性能会受到极大的影响。进行空间映射时的有效对数据维的维度的预测，因此我们认为利用深度学习的预测精度来最大学习机的特性，可以很好地改善极限学习机的特性。 本文采用哈里斯鹰算法的进一步优化DELM超参数，仿真结果改进，预测精度更高。
⛄ 部分代码
% Developed in MATLAB R2013b
% Source codes demo version 1.0
% _____________________________________________________
% Main paper:
% Harris hawks optimization: Algorithm and applications
% Ali Asghar Heidari, Seyedali Mirjalili, Hossam Faris, Ibrahim Aljarah, Majdi Mafarja, Huiling Chen
% Future Generation Computer Systems,
% DOI: https://doi.org/10.1016/j.future.2019.02.028
% https://www.sciencedirect.com/science/article/pii/S0167739X18313530
% _____________________________________________________
% You can run the HHO code online at codeocean.com https://doi.org/10.24433/CO.1455672.v1
% You can find the HHO code at https://github.com/aliasghar68/Harris-hawks-optimization-Algorithm-and-applications-.git
% _____________________________________________________
% Author, inventor and programmer: Ali Asghar Heidari,
% PhD research intern, Department of Computer Science, School of Computing, National University of Singapore, Singapore
% Exceptionally Talented Ph. DC funded by Iran's National Elites Foundation (INEF), University of Tehran
% 03-03-2019
% Researchgate: https://www.researchgate.net/profile/Ali_Asghar_Heidari
% e-Mail: as_heidari@ut.ac.ir, aliasghar68@gmail.com,
% e-Mail (Singapore): aliasgha@comp.nus.edu.sg, t0917038@u.nus.edu
% _____________________________________________________
% Co-author and Advisor: Seyedali Mirjalili
%
% e-Mail: ali.mirjalili@gmail.com
% seyedali.mirjalili@griffithuni.edu.au
%
% Homepage: http://www.alimirjalili.com
% _____________________________________________________
% Co-authors: Hossam Faris, Ibrahim Aljarah, Majdi Mafarja, and Hui-Ling Chen
% Homepage: http://www.evo-ml.com/2019/03/02/hho/
% _____________________________________________________
%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Harris's hawk optimizer: In this algorithm, Harris' hawks try to catch the rabbit.
% T: maximum iterations, N: populatoin size, CNVG: Convergence curve
% To run HHO: [Rabbit_Energy,Rabbit_Location,CNVG]=HHO(N,T,lb,ub,dim,fobj)
function [Rabbit_Energy,Rabbit_Location,CNVG]=HHO(N,T,lb,ub,dim,fobj)
disp('HHO is now tackling your problem')
tic
% initialize the location and Energy of the rabbit
Rabbit_Locatinotallow=zeros(1,dim);
Rabbit_Energy=inf;
%Initialize the locations of Harris' hawks
X=initialization(N,dim,ub,lb);
CNVG=zeros(1,T);
t=0; % Loop counter
while t<T
for i=1:size(X,1)
% Check boundries
FU=X(i,:)>ub;FL=X(i,:)<lb;X(i,:)=(X(i,:).*(~(FU+FL)))+ub.*FU+lb.*FL;
% fitness of locations
fitness=fobj(X(i,:));
% Update the location of Rabbit
if fitness<Rabbit_Energy
Rabbit_Energy=fitness;
Rabbit_Locatinotallow=X(i,:);
end
end
E1=2*(1-(t/T)); % factor to show the decreaing energy of rabbit
% Update the location of Harris' hawks
for i=1:size(X,1)
E0=2*rand()-1; %-1<E0<1
Escaping_Energy=E1*(E0); % escaping energy of rabbit
if abs(Escaping_Energy)>=1
%% Exploration:
% Harris' hawks perch randomly based on 2 strategy:
q=rand();
rand_Hawk_index = floor(N*rand()+1);
X_rand = X(rand_Hawk_index, :);
if q<0.5
% perch based on other family members
X(i,:)=X_rand-rand()*abs(X_rand-2*rand()*X(i,:));
elseif q>=0.5
% perch on a random tall tree (random site inside group's home range)
X(i,:)=(Rabbit_Location(1,:)-mean(X))-rand()*((ub-lb)*rand+lb);
end
elseif abs(Escaping_Energy)<1
%% Exploitation:
% Attacking the rabbit using 4 strategies regarding the behavior of the rabbit
%% phase 1: surprise pounce (seven kills)
% surprise pounce (seven kills): multiple, short rapid dives by different hawks
r=rand(); % probablity of each event
if r>=0.5 && abs(Escaping_Energy)<0.5 % Hard besiege
X(i,:)=(Rabbit_Location)-Escaping_Energy*abs(Rabbit_Location-X(i,:));
end
if r>=0.5 && abs(Escaping_Energy)>=0.5 % Soft besiege
Jump_strength=2*(1-rand()); % random jump strength of the rabbit
X(i,:)=(Rabbit_Location-X(i,:))-Escaping_Energy*abs(Jump_strength*Rabbit_Location-X(i,:));
end
%% phase 2: performing team rapid dives (leapfrog movements)
if r<0.5 && abs(Escaping_Energy)>=0.5, % Soft besiege % rabbit try to escape by many zigzag deceptive motions
Jump_strength=2*(1-rand());
X1=Rabbit_Location-Escaping_Energy*abs(Jump_strength*Rabbit_Location-X(i,:));
if fobj(X1)<fobj(X(i,:)) % improved move?
X(i,:)=X1;
else % hawks perform levy-based short rapid dives around the rabbit
X2=Rabbit_Location-Escaping_Energy*abs(Jump_strength*Rabbit_Location-X(i,:))+rand(1,dim).*Levy(dim);
if (fobj(X2)<fobj(X(i,:))), % improved move?
X(i,:)=X2;
end
end
end
if r<0.5 && abs(Escaping_Energy)<0.5, % Hard besiege % rabbit try to escape by many zigzag deceptive motions
% hawks try to decrease their average location with the rabbit
Jump_strength=2*(1-rand());
X1=Rabbit_Location-Escaping_Energy*abs(Jump_strength*Rabbit_Location-mean(X));
if fobj(X1)<fobj(X(i,:)) % improved move?
X(i,:)=X1;
else % Perform levy-based short rapid dives around the rabbit
X2=Rabbit_Location-Escaping_Energy*abs(Jump_strength*Rabbit_Location-mean(X))+rand(1,dim).*Levy(dim);
if (fobj(X2)<fobj(X(i,:))), % improved move?
X(i,:)=X2;
end
end
end
%%
end
end
t=t+1;
CNVG(t)=Rabbit_Energy;
% Print the progress every 100 iterations
% if mod(t,100)==0
% display(['At iteration ', num2str(t), ' the best fitness is ', num2str(Rabbit_Energy)]);
% end
end
toc
end
% ___________________________________
function o=Levy(d)
beta=1.5;
sigma=(gamma(1+beta)*sin(pi*beta/2)/(gamma((1+beta)/2)*beta*2^((beta-1)/2)))^(1/beta);
u=randn(1,d)*sigma;v=randn(1,d);step=u./abs(v).^(1/beta);
o=step;
end
⛄ 运行结果
⛄ 参考文献
[1]吴丁杰, 温立书. 一种基于哈里斯鹰算法优化的核极限学习机[J]. 信息通信, 2021(034-011).
