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    发布日期: 2023-06-20
  • 语言: Matlab
  • 标签: 模式分类  

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模式分类Pattern Classification第二版(Duda)英文版教材及参考答案(含matlab代码)

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代码片段和文件信息

function [test_targets E] = ada_boost(train_patterns train_targets test_patterns params)

% Classify using the AdaBoost algorithm
% Inputs:
%  train_patterns - Train patterns
% train_targets - Train targets
%   test_patterns   - Test  patterns
% Params - [NumberOfIterations Weak Learner Type Learner‘s parameters]
%
% Outputs
% test_targets - Predicted targets
%   E               - Errors through the iterations
%
% NOTE: Suitable for only two classes
%

[k_max weak_learner alg_param] = process_params(params);

[NiM] = size(train_patterns);
W   = ones(1M)/M;
IterDisp = 10;

full_patterns   = [train_patterns test_patterns];
test_targets    = zeros(1 size(test_patterns2));

%Do the AdaBoosting
for k = 1:k_max
   %Train weak learner Ck using the data sampled according to W:
   %...so sample the data according to W
   randnum = rand(1M);
   cW    = cumsum(W);
   indices = zeros(1M);
   for i = 1:M
      %Find which bin the random number falls into
      loc = max(find(randnum(i) > cW))+1;
      if isempty(loc)
         indices(i) = 1;
      else
         indices(i) = loc;
      end
   end
   
   %...and now train the classifier
   Ck  = feval(weak_learner train_patterns(: indices) train_targets(indices) full_patterns alg_param);

   %Ek <- Training error of Ck 
   E(k) = sum(W.*(Ck(1:M) ~= train_targets));
   
   if (E(k) == 0)
      break
   end
   
   %alpha_k <- 1/2*ln(1-Ek)/Ek)
   alpha_k = 0.5*log((1-E(k))/E(k));
   
   %W_k+1 = W_k/Z*exp(+/-alpha)
   W  = W.*exp(alpha_k*(xor(Ck(1:M)train_targets)*2-1));
   W  = W./sum(W);
   
   %Update the test targets
   test_targets  = test_targets + alpha_k*(2*Ck(M+1:end)-1);
   
   if (k/IterDisp == floor(k/IterDisp))
      disp([‘Completed ‘ num2str(k) ‘ boosting iterations‘])
   end
   
end

test_targets = test_targets > 0;

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     文件     9682107  2016-09-21 15:24  pattern classification.pdf
     目录           0  2016-09-26 15:06  PatternClassification_Solution\
     文件     2812830  2016-09-26 15:03  PatternClassification_Solution\Duda-problemsolutions.pdf
     目录           0  2016-09-26 15:06  PatternClassification_Solution\Pattern Classification 2nd edition (代码和手册)\
     目录           0  2016-09-26 15:11  PatternClassification_Solution\Pattern Classification 2nd edition (代码和手册)\模式分类教材\
     文件      622735  2011-04-28 10:46  PatternClassification_Solution\Pattern Classification 2nd edition (代码和手册)\模式分类教材\Computer manual in MATLAB to accompany Pattern Classification.pdf
     目录           0  2016-09-26 15:06  PatternClassification_Solution\Pattern Classification 2nd edition (代码和手册)\模式分类(Matlab程序)\
     文件      952782  2002-05-20 08:36  PatternClassification_Solution\Pattern Classification 2nd edition (代码和手册)\模式分类(Matlab程序)\About.bmp
     文件        1892  2003-06-26 20:48  PatternClassification_Solution\Pattern Classification 2nd edition (代码和手册)\模式分类(Matlab程序)\Ada_Boost.m
     文件        2815  2003-06-10 20:38  PatternClassification_Solution\Pattern Classification 2nd edition (代码和手册)\模式分类(Matlab程序)\ADDC.m
     文件        4439  2003-08-31 20:47  PatternClassification_Solution\Pattern Classification 2nd edition (代码和手册)\模式分类(Matlab程序)\AGHC.m
     文件        3397  2003-06-26 21:06  PatternClassification_Solution\Pattern Classification 2nd edition (代码和手册)\模式分类(Matlab程序)\Backpropagation_Batch.m
     文件        5308  2003-06-26 21:06  PatternClassification_Solution\Pattern Classification 2nd edition (代码和手册)\模式分类(Matlab程序)\Backpropagation_CGD.m
     文件        6494  2003-02-22 20:26  PatternClassification_Solution\Pattern Classification 2nd edition (代码和手册)\模式分类(Matlab程序)\Backpropagation_Quickprop.m
     文件        5029  2003-02-22 20:42  PatternClassification_Solution\Pattern Classification 2nd edition (代码和手册)\模式分类(Matlab程序)\Backpropagation_Recurrent.m
     文件        3334  2003-02-22 20:46  PatternClassification_Solution\Pattern Classification 2nd edition (代码和手册)\模式分类(Matlab程序)\Backpropagation_SM.m
     文件        3117  2003-02-22 20:50  PatternClassification_Solution\Pattern Classification 2nd edition (代码和手册)\模式分类(Matlab程序)\Backpropagation_Stochastic.m
     文件        1421  2003-03-05 19:07  PatternClassification_Solution\Pattern Classification 2nd edition (代码和手册)\模式分类(Matlab程序)\Balanced_Winnow.m
     文件        3343  2003-04-02 20:27  PatternClassification_Solution\Pattern Classification 2nd edition (代码和手册)\模式分类(Matlab程序)\Bayesian_Model_Comparison.m
     文件         588  2001-12-27 09:56  PatternClassification_Solution\Pattern Classification 2nd edition (代码和手册)\模式分类(Matlab程序)\Bhattacharyya.m
     文件        3248  2003-03-09 22:07  PatternClassification_Solution\Pattern Classification 2nd edition (代码和手册)\模式分类(Matlab程序)\BIMSEC.m
     文件        5599  2003-06-10 20:37  PatternClassification_Solution\Pattern Classification 2nd edition (代码和手册)\模式分类(Matlab程序)\C4_5.m
     文件         905  2003-02-22 21:13  PatternClassification_Solution\Pattern Classification 2nd edition (代码和手册)\模式分类(Matlab程序)\calculate_error.m
     文件         756  2003-02-18 17:57  PatternClassification_Solution\Pattern Classification 2nd edition (代码和手册)\模式分类(Matlab程序)\calculate_region.m
     文件        3721  2003-11-06 22:06  PatternClassification_Solution\Pattern Classification 2nd edition (代码和手册)\模式分类(Matlab程序)\CART.m
     文件         846  2003-02-22 21:36  PatternClassification_Solution\Pattern Classification 2nd edition (代码和手册)\模式分类(Matlab程序)\CARTfunctions.m
     文件        5527  2003-02-22 21:45  PatternClassification_Solution\Pattern Classification 2nd edition (代码和手册)\模式分类(Matlab程序)\Cascade_Correlation.m
     文件         902  2001-12-27 10:15  PatternClassification_Solution\Pattern Classification 2nd edition (代码和手册)\模式分类(Matlab程序)\Chernoff.m
     文件        2745  2003-11-08 22:59  PatternClassification_Solution\Pattern Classification 2nd edition (代码和手册)\模式分类(Matlab程序)\Classification.txt
     文件        1995  2003-02-22 21:48  PatternClassification_Solution\Pattern Classification 2nd edition (代码和手册)\模式分类(Matlab程序)\classification_error.m
     文件       19454  2003-09-21 21:04  PatternClassification_Solution\Pattern Classification 2nd edition (代码和手册)\模式分类(Matlab程序)\classifier.m
............此处省略153个文件信息

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