Tìm hiểu mạng kohonen và cài đặt ứng dụng

Tìm hiểu mạng kohonen và cài đặt ứng dụng

Giới thiệu về mạng nơron nhân tạo I. Cấu trúc và mô hình mạng nơron 1. Mô hình một nơron sinh học   !"#$%$%&%' ( )%$%#*+,"-"&' ( .#/' ( 0#$1+,"' ( .%#-!2+,"-,345' 63789!2&-:+"'; 5<="5>*-"&?5"@A5"A3B 7&C"D<B"37-A3="" E8-" 'F>GH =",4 ' Hình 1. Một nơron sinh học ;H IJ!&**KA JLK3"'M-!BAJL !9!2>5A3B&-<L&C"'N >$"-@OA3&-<L4!>P' (G( Hình 2. Sự liên kết các nơron 2. Cấu trúc và mô hình của một nơron nhân tạo ;L>5-!B-Q"K8;R"& !2-!B;(S-!B&-!BA ,"TU%T%%V' ;L>-"& G  P '''  &-"  !"# Hình 3. Mô hình một nơron nhân tạo W+5# (P( ( N*5-"&#X5+,"&5+,"!2 -!B-!&$!C$&%Q"' ( N*5OA3U5 V#;YOA3-!B,8 U!2-!B OA3V'N OA34+,"& IZ!2-!BA,"[ Z 'NL!25 -!BA81"O82-A8&-!B** O\="5>' ( ]<UF<V#N!2$E-+<+5-"&&C  OA3' ( ^!_#^!_!2-!B-!&! "Q' ( F"Q#F$E-C&-"Y'^ *-"&A3="<&!_-9'NL!2 &-"Y-!BC-`aGb:`(GGb' R5"QK-$5"3+:"3' c,D"QE"&?5&A, !23A3' ( M"#X+,"-"&CYd - -"' cQ:5K"7-!BLe:"I"#  VU iii netfy θ −= & j n j iji xwnet ∑ = = G -# G  P f  5+,"-"&S[ G [ P f[  5 A3 I%  <g"Q i θ !_   +,"-"' ^!&*!D!/h*5+," -"&U/5+,"&C OA3+<5+" -!B@A3="-3"QV&+,"-"UA3=" "QV' (i( • F"Q5$"# ( F!C    < ≥ = aa aG xkhi xkhi y UG'jV ( FC:US!CV    <− ≥ == aG aG VU xkhi xkhi xy UG'kV ( F*      < ≤≤ > == aa Ga GG VU xkhi xkhix xkhi xy UG'lV ( F!_-D x λ − + = e y G G &Cmna UG'oV ( F!_D G G P − + = − x λ e y &Cmna UG'GaV • M@p5$"Q-!B"$q!"# Hình 4. Đồ thị các dạng hàm truyền (r( II. 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Mạng nơron truyền thẳng nhiều lớp ;Q"CUF>j'V5C-!B/i"-/# • XC&C-"O*+,"&  U|GP'''V';Y+,"   -!B-!-3K5C-"&'NL!25 -"&AL3-<5+,"&  I7AL5  :AL5"-<7H-&S / 5+,"' • XCyC"C&7ALD3O,&C3C O!5C&t' • XCC5+,"" E' 3. Mạng nơron phản hồi  ;@-"Y-!B="8  &C-"&5EC-!BX%!>j (l( 4. Mạng nơron hồi quy ;@D,-&S-!B @="!>j$';@=" OA3- I! Fg%$"L\&Q5<-pUF>j'V';]0;" @="@PCOA3PQ"AL-!Bv&C+,"&t' ^OI"@=" OA3AL- I>d: &K-QIQ"&C"Qz&@="  OA3- I' 5. Mạng Hopfield ;Fg%$@C-!BH>j''RK"7 3-!B,>k'6-&C+,"2-!B Fg%$2&K"7h-!B@="' Hình 7. Cấu trúc của mạng Hopfield ^!Fg%$-9&d8OK7-"&O Z & 5p!_ j θ UZ|GP'''V';-Q"="8-/Y7 AL-!2@&Q+'^7-"IZ-!B CY-"& (o( 7A5=" [ Z &C ≠ ZU|GP'''V5A5[  |aU&C| GP'''V' ;-Q"="4 Fg%$- II[ Z |[ Z U&CZ|GP'''V'6-"***Y7!"#  G VUVGU           −+= ∑ ≠ = + n ij j i k jij k i xywy θ  |GP'''UG'GGV X"***O-!B+55IAL-@'MQ" s&C2!CH7**-!B-" '.D**3%O7d$\+4-"-9-!B* *'^5A5$!C>I-AL-@Y-" -!B**-*' RDA5,4"***-@&"***AL-@' cC"***AL-@>dH5/e,U&C5 p-"-9-!B5-p!CV'NA-&C"***-@> \8Y- -p:&SC' 6. Mạng BAM ;]0;@C&-!B%!!2B8 Fg%$'}-/Hu2&>-&$q"' Hình 8. Cấu trúc của BAM (Ga( . (a) Mạng truyền thẳng một lớp (b) Mạng hồi tiếp một lớp (k( (c) Mạng truyền thẳng nhiều lớp (d) Mạng nơron hồi quy Hình 6. Một số dạng mạng nơron 2. Mạng. Giới thiệu về mạng nơron nhân tạo I. Cấu trúc và mô hình mạng nơron 1. Mô hình một nơron sinh học 