TA的每日心情 | 开心 2022-1-21 15:08 |
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签到天数: 1 天 [LV.1]初来乍到
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%开始迭代6 g1 N" C8 R8 R |( d2 C1 }* G
for i=1:maxiter, _; d% o) V4 p3 a1 R9 U9 _
hid_input = net.w1 * SampInEx; %3X1002 s4 P* P6 z$ _$ q: M4 X, Z" _
hid_out = logsig(hid_input); %3X100
, K4 Y: R( T8 r5 M2 _8 N" [4 a ou_input1 = [hid_out;ones(1,nTrainNum)]; %4X100. [' b. v8 v: m% {4 j) K; z
ou_input2 = net.w2 * ou_input1; %1X100; ?8 y `0 T) M& a7 a9 {/ X
out_out =logsig(ou_input2); %1X100. f) F% h- a+ Q F- n/ E+ _ X& |7 @
out_Rec(:,i) = out_out; %记录每次的输出
% F: J: n/ _# i8 ` err = expectedOut'-out_out;
" ?' k5 @* P5 k. C' r0 p8 r# R sse = sumsqr(err);
$ u$ G: R( B; o% b8 } errRec(i) = sse; %记录每次的错误/ n, _, W8 x# @* _8 t6 L
fprintf('第%d次迭代 误差: %f\n',i,sse);& z8 ^* J3 c; o
iteration = iteration+1;+ }2 @0 T/ G' Z
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%判断是否收敛2 y; G9 x' _) ?' k) W$ q8 I& f9 q! `
if sse<=eb' D7 H( S p9 B( \9 N) Q7 g# ?
break;% b: a4 w% ]$ Y5 H; [( {) r
end
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%误差反向传播
. i2 b) m; Y! v& w* g J %隐含层与输出层之间的局部梯度度
; F: f! F* D1 A8 c$ p- z# l DELTA = err.*dlogsig(ou_input2,out_out);
5 T3 [3 ]* q# j2 { %输入层与隐含层之间的局部梯度
3 f- A. ~! N8 @$ J( U; \ delta = net.w2(:,1:end-1)'*DELTA.*dlogsig(hid_input,hid_out);
S( x9 T/ E; R" y- c, X# H %权值修改量% `$ p9 P" @. h. m5 V. ]6 z
dWEX=DELTA*ou_input1';# c( I4 ~; b$ z" m
dwex=delta*SampInEx';9 W2 g: v, B! g/ Y9 f
%修改权值,如果不是第一次修改,则使用动量因子
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2 b8 t3 }" \) j3 T net.w2 = net.w2+eta*dWEX;+ s! t8 v9 i; M! y
net.w1 = net.w1+eta*dwex;
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: i1 s. Q T; W* v* ` net.w2 = net.w2+(1-mc)*eta*dWEX+mc*dWEXOld;
% w- c1 T# r3 a: e net.w1 = net.w1+(1-mc)*eta*dwex+mc*dwexOld;
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%记录上一次的权值修改量
l9 B4 C' e% f$ ? dWEXOld = dWEX;
* L( {; U) p0 x' m: X# u dwexOld = dwex;
6 E+ ]# g8 r' c" @4 Gend
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