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8 K9 L: v: _( n& q
for i=1:maxiter
7 F/ J- z5 z- _0 x2 g7 E hid_input = net.w1 * SampInEx; %3X1000 h, R. ~* [$ k3 V: h1 X+ H
hid_out = logsig(hid_input); %3X100 . M/ v0 G, x. R
ou_input1 = [hid_out;ones(1,nTrainNum)]; %4X100. O' Q8 n* V/ r5 s. c4 D2 S* Y, T
ou_input2 = net.w2 * ou_input1; %1X100+ p, A1 C' q4 }! o7 x
out_out =logsig(ou_input2); %1X100
% r) t u2 \# O7 {9 D( b out_Rec(:,i) = out_out; %记录每次的输出% P0 {* o% v$ c" A; N0 H
err = expectedOut'-out_out;" `* l* I) u! B" Q' t6 H
sse = sumsqr(err);( V; p" t% D- ]. `8 i; [
errRec(i) = sse; %记录每次的错误: _) f4 S- G6 a2 O
fprintf('第%d次迭代 误差: %f\n',i,sse);
9 R5 I- s& I* h/ O. K# x* J$ A iteration = iteration+1;6 p3 p" l4 {- b0 |% I) K
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%判断是否收敛
( Y$ c2 U7 y" b$ a. J: g* U! O8 \ if sse<=eb
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end
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%误差反向传播
+ h: ~" y' B( a% n8 c2 v+ T0 L %隐含层与输出层之间的局部梯度度1 Y: e1 h2 }% Z/ v, v$ f4 B' [3 v
DELTA = err.*dlogsig(ou_input2,out_out);$ d4 U- Z7 k$ P+ {
%输入层与隐含层之间的局部梯度
- A2 Q6 |) Q9 x+ t3 F delta = net.w2(:,1:end-1)'*DELTA.*dlogsig(hid_input,hid_out);
, B7 R. A' Y9 A1 w* _2 Z %权值修改量$ v E. u; ]. `7 c5 o
dWEX=DELTA*ou_input1';
9 y9 X1 m, l2 g1 g5 v+ T dwex=delta*SampInEx';# [, S$ I. Y4 m0 R; X/ \
%修改权值,如果不是第一次修改,则使用动量因子
% `3 M& c @; b2 c' t if i==1" B. q9 D- K2 O# E1 Z# i- o
net.w2 = net.w2+eta*dWEX;
7 b3 Q$ o# d$ k! Y) Q# F( ~. w& l# \ net.w1 = net.w1+eta*dwex;
+ n7 g( y6 g- O- v& O else
- Q7 S: g- M0 C9 Q, Z0 _ net.w2 = net.w2+(1-mc)*eta*dWEX+mc*dWEXOld;
+ K. v9 U: b& h, w! F6 O% x" c net.w1 = net.w1+(1-mc)*eta*dwex+mc*dwexOld;
# F' N3 p5 ]4 S; V; ?9 H end
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2 ?& y8 L. f8 `, T %记录上一次的权值修改量/ W" C# f. \ R# I2 L
dWEXOld = dWEX;
: H& `, `3 E* O' U' s- f dwexOld = dwex;
( _( O4 y- S+ _, i+ V2 y' z) wend
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