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
* k& U! R" {' v" Q; zfor i=1:maxiter
0 g5 {' J( G' G- e4 r5 g hid_input = net.w1 * SampInEx; %3X100/ A( t/ l3 r* J {) ]' R
hid_out = logsig(hid_input); %3X100
2 K0 [. R6 f" |; k6 b% M* n5 p( r ou_input1 = [hid_out;ones(1,nTrainNum)]; %4X100( w, f2 q) g/ K- T
ou_input2 = net.w2 * ou_input1; %1X100
; m) V. C9 v( n% l# n out_out =logsig(ou_input2); %1X1003 j1 V: g7 s( p0 E; S, L2 _# o9 s
out_Rec(:,i) = out_out; %记录每次的输出: ~3 n* a, f/ f8 V
err = expectedOut'-out_out;! l% J Y# _ K" G( w
sse = sumsqr(err);
; E6 y% u7 r6 K* E errRec(i) = sse; %记录每次的错误! s- n$ I7 Q) _# {/ }+ |: Y
fprintf('第%d次迭代 误差: %f\n',i,sse);
' f3 Y' N% H" P8 m' y iteration = iteration+1;" Y' }5 ~0 \2 R, u+ q3 H8 k8 h$ {8 N
u, r; n$ j) A4 s %判断是否收敛# X. p) T, v( m9 [: G7 d6 T$ m
if sse<=eb
" `( {/ Q) A, m# ?$ O break;: P0 C, p# M( {5 D
end
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%误差反向传播/ {! h. v* |+ \# H( ?& e
%隐含层与输出层之间的局部梯度度( {( a: I3 N* L2 ^5 E
DELTA = err.*dlogsig(ou_input2,out_out);
1 M) B4 [ a0 t+ v+ j %输入层与隐含层之间的局部梯度
& x- Y( A u0 C delta = net.w2(:,1:end-1)'*DELTA.*dlogsig(hid_input,hid_out);& H" u2 _9 P: I. I& h' H1 E+ ~
%权值修改量3 |! x# o: m. ?3 h- O4 @. Y
dWEX=DELTA*ou_input1';
: V) N- [& k; t. M7 B1 c# b1 U) | dwex=delta*SampInEx';- T2 `4 R; J7 e* v7 b3 z/ D5 ^' h/ J
%修改权值,如果不是第一次修改,则使用动量因子/ H5 u, A9 U% H+ P0 c8 L; q- A
if i==1
3 k7 g& K# b) V; w5 U7 T net.w2 = net.w2+eta*dWEX;
5 Y0 L: Q8 E2 r& K! x- }) q0 u; m1 J net.w1 = net.w1+eta*dwex;9 n: V, w# {9 ~2 a7 \9 \+ `* ^) R3 r
else* S% B7 T. u, \# |
net.w2 = net.w2+(1-mc)*eta*dWEX+mc*dWEXOld;$ m8 h: H1 [! H6 k5 n4 V6 i1 B
net.w1 = net.w1+(1-mc)*eta*dwex+mc*dwexOld;
4 W! v, O8 k; S% p5 q( h% w end
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%记录上一次的权值修改量
3 O+ R; ?" n8 _" x dWEXOld = dWEX;
+ F, k2 X9 Z: X6 g) J9 R$ k0 X8 a dwexOld = dwex;* b9 h9 ~: r8 g$ a6 Y3 F8 c
end/ q* \4 w G# A
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