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$ V( L4 N& ^0 _
for i=1:maxiter
9 Q c: z8 `4 g) S$ ?% V/ K; ^4 P hid_input = net.w1 * SampInEx; %3X100, r' K& U0 b& o" ^
hid_out = logsig(hid_input); %3X100 s4 C5 z$ W! j( A' R6 J+ o
ou_input1 = [hid_out;ones(1,nTrainNum)]; %4X100; x* P9 e# \! A" a; |
ou_input2 = net.w2 * ou_input1; %1X100
1 S+ S, T2 h, S2 z; o0 | out_out =logsig(ou_input2); %1X100% S5 J# U; P/ R* Q) {3 t
out_Rec(:,i) = out_out; %记录每次的输出
# j8 N9 L2 A8 |8 @: U3 S9 d err = expectedOut'-out_out;# ]: j& }* [" R* K' W
sse = sumsqr(err);
7 Y% z' [: n! y errRec(i) = sse; %记录每次的错误3 D( x/ `, z f' y
fprintf('第%d次迭代 误差: %f\n',i,sse);
$ U- _+ j( F' W7 Z; w/ K iteration = iteration+1;
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/ A. a/ |8 ]1 D+ N7 v %判断是否收敛, a, L. }1 x3 g( X. l. _ @
if sse<=eb7 v" Z0 {3 h+ `1 o
break;
- i5 l2 X+ c5 [/ r4 X+ s end
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%误差反向传播
" d, V4 v. s/ X; c# q) [ %隐含层与输出层之间的局部梯度度9 {/ W% K! r$ ] t1 p
DELTA = err.*dlogsig(ou_input2,out_out);
L8 n. j; ?' y3 v+ [3 L C %输入层与隐含层之间的局部梯度
) Q& }) y+ c5 F3 S; O. B/ ^3 m delta = net.w2(:,1:end-1)'*DELTA.*dlogsig(hid_input,hid_out);
7 |6 }% Z" |9 x' ^ %权值修改量
0 c3 \5 x4 A0 V# X0 o0 B# n dWEX=DELTA*ou_input1';
; I3 Z, s& D- ]) [% k' n7 s dwex=delta*SampInEx';
. d$ b, q7 \3 ?$ [- a7 E4 v %修改权值,如果不是第一次修改,则使用动量因子
2 |! m) B1 w% D3 |) ~ if i==17 O) A/ B; _- g, h! S- Z$ ]' p
net.w2 = net.w2+eta*dWEX;4 ]3 O# U/ K( `; P
net.w1 = net.w1+eta*dwex;
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net.w2 = net.w2+(1-mc)*eta*dWEX+mc*dWEXOld;5 Z: l9 s7 L/ l. E
net.w1 = net.w1+(1-mc)*eta*dwex+mc*dwexOld;; o8 ]. Y6 M* ^8 J2 x
end& U9 w8 @' s0 A/ I% ?/ W, |- C
" {" ~+ B! t, n4 B %记录上一次的权值修改量
5 S; Z: T+ Y- M- n" ` dWEXOld = dWEX;2 L+ ?7 v; ~6 ^; X0 q6 e" V
dwexOld = dwex;
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