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Message-Id: <200306101645.h5AGjNI19095@mbox00.iij4u.or.jp>
From: Tomohiko Nakano <tomohiko@dd.iij4u.or.jp>
To: FreeBSD-users-jp@jp.FreeBSD.org
In-Reply-To: <200306100915.h5A9FQqY031684@urban>
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Date: Wed, 11 Jun 2003 01:45:23 +0900
X-Sequence: FreeBSD-users-jp 74904
Subject: [FreeBSD-users-jp 74904] Re: spammers love jp.FreeBSD.org
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$BCfLn$G$9!#(B
$B$*JV;v$"$j$,$H$&$4$6$$$^$9!#(B

Seigo Tanimura$B$5$s$N(B<200306100915.h5A9FQqY031684@urban>$B$+$i(B
>$BC+B<!s$3$3$O2?$N(B mailing list $B$J$s$@(B($B>P(B) $B$G$9!#(B

$B$9$$$^$;$s!J>P!K(B

>On Tue, 10 Jun 2003 16:15:09 +0900,
>tomohiko> $B$3$3$G!"%Y%$%:$NDjM}$K$h$j!"(B
>tomohiko> P(Ci|X)=P(X|Ci)P(Ci)/P(X)
>tomohiko>        =P(x1|Ci)*P(x2|Ci)* ... P(xn|Ci)P(Ci)/P(X)
>tomohiko> $B$H7W;;$G$-$k!#(B
>
>$B$3$3$G$O(B xi $B3F!9$NFHN)@-$r2>Dj$7$F$^$9$M!#?t3XE*$K$OC1=c$K(B = $B$G7k$Y$^$;$s!#(B

$B$O$$!#$*$C$7$c$k$H$*$j?t3XE*$K$O!_$G$9$,!"(BData mining$BE*$K$OFHN)@-$r2>(B
$BDj$7$F$7$^$&$3$H$,B?$$$G$9$7!":#2s$NOC$NN.$l$K$O4X78$J$$$+$H;W$C$F>JN,(B
$B$7$F$7$^$$$^$7$?!#(B

>P(Ci) $B$d(B P(xi|Cj) $B$OJ,N`4o$rFCD'$E$1$kMWAG$H$$$&0UL#$G!"%Q%i%a%?$H$$$($^(B
>$B$9$h$M(B($B$3$l$i$NCM$rJQ$($l$PF1$8%"%k%4%j%:%`$G$b0c$&J,N`4o$,:n$l$k(B)$B!#5U$K(B
>$B$$$($P!"J,N`4o$r:n$kLdBj$O!";vNc$+$i$3$l$i$N%Q%i%a%?$NCM$r5a$a$kLdBj$K$J(B
>$B$k$o$1$G$9!#(B

$B$J$k$[$I!#(BP(Ci)$B$d(BP(xi|Cj)$B$OD4@0$NM>CO$,$"$j$^$9$7!"%Y%$%8%"%s%9%Q%`%U(B
$B%#%k%?$rDs>'$7$?!J!)!K(BPaul Graham$B$5$s$b$$$m$$$m9)IW$7$F$$$k$h$&$G$9(B
$B!J8mG'<1$r8:$i$9$?$a$K0BA4B&$K4s$;$F$$$k!K!#(B

$B$?$@!"$=$&$d$C$FD4@0$7$?$b$N$O$b$O$d(BNaive Bayesian Classifier$B$H$O8F$P(B
$B$J$$$s$8$c$J$$$+$H$$$&$N$,;d$NG'<1$G$9!#(B

>$B$G!"F,$K$O%Q%i%a%?$r(B EM $B%"%k%4%j%:%`$G5a$a$k$J$s$F$$$&$N$,=q$$$F$"$j$^$7(B
>$B$?!#$,!"(BNaive Bayes $B$@$HD>@\5a$^$C$F$7$^$$$=$&$G$9$M(B($B%9%`!<%8%s%0$0$i$$(B
>$B$O$d$C$?J}$,$$$$$@$m$&$,(B)$B!#(B
>
>$B$?$@!"$"$i$+$8$a(B mail $B$r$?$a9~$s$G%Q%i%a%?$r5a$a$F$*$-!"?7$7$$(B spam $B$,Mh(B
>$B$?$i(B EM $B%"%k%4%j%:%`$r(B1$B2s$0$i$$2s$7$F%Q%i%a%?$KH?1G$5$;$k$J$s$F$$$&$N$O(B
>$B$"$j$J$N$+$bCN$l$^$;$s!#%Q%i%a%?$NJQ2=NL$,@)8f$G$-$J$$62$l$O$"$j$^$9$,!#(B

$B!X%Q%i%a%?$r(BEM$B%"%k%4%j%:%`$G5a$a$k!Y$C$FOC$O$I$3$K=q$$$F$"$k$N$+J,$+$i(B
$B$J$+$C$?$s$G$9$,!"(BP(Ci)$B$d(BP(xi|Cj)$B$r$I$&D4@0$9$k$+$H$+%Q%i%a%?$rD4@0$9(B
$B$k$3$H$K$h$C$F!"$h$j$h$$@:EY$r=P$=$&$H$$$&J}8~$NEXNO$O$b$A$m$s$"$j$@$H(B
$B;W$$$^$9!#$?$@!"8=:_$N$H$3$m$[$H$s$I(BNaive Bayes$B$H$$$C$F$h$$%7%s%W%k$J(B
$BJ,N`4o$G$b$=$3$=$3$J@:EY$,$G$F$$$k$N$G!"$7$P$i$/MM;R8+$F$_$h$&$H;W$C$F(B
$B$$$^$9!#(B

$B$3$3$G!"A0$N%a!<%k$KLa$j$^$9$,!"(B

>$B$G!"FC$K(B spam $BAj<j$N>l9g$@$H!"2a3X=,$GB-$r0z$CD%$i$l$k$N$OCWL?E*$G$9!#:G(B
>$B=i$+$iCF$+$l$k$H$o$+$C$F$k$b$N$rAw$k(B spammer $B$O$$$^$;$s$h$M!#$b$7$o$?$7(B
>$B$,(B spam $B$rEj$2$h$&$H$7$?$i!"2a5n$N(B mail $B$rD4$Y5s$2$?>e$GLUE@$K$J$k$H$3$m(B
>$B$rFM$-$K$$$/$G$7$g$&!#<B:]!"$o$?$7$b(B SpamAssassin $B$O;H$C$F$$$^$9$,!"L$CN(B
>$B;vNc$KBP$7$F$O$+$J$j<e$$$G$9!#D>4Q$N?t;z$G$9$,!"(B4$B3d$0$i$$$OAGDL$j$7$F$/(B
>$B$l$^$9!#(B
>

$B;d$,<BAu$7$?%$%s%A%-(B:-)Naive Bayese Classifier$B$G$b#43d$OAGDL$7$7$^$;(B
$B$s!#$^$@1?MQ4|4V$,C;$/$F$^$H$b$J%G!<%?$O=P$;$^$;$s$,!"(B

$B3X=,%G!<%?!J1Q8l%a!<%k$N$_!K(B
SPAM: 141
non-SPAM: 2342

$B=hM}%G!<%?!J1Q8l%a!<%k$N$_!K(B
$B<u?.%a!<%k?t!'(B 349$B!JFb(BSPAM:176, non-SPAM:173$B!K(B
non-SPAM$B$r(BSPAM$B$HG'<1(B: 1$B!J(B0.5%$B!K(B
SPAM$B$r(Bnon-SPAM$B$HG'<1(B: 31$B!J(B17$B!s!K(B

$B$G$9!#3X=,%G!<%?$,>/$J$9$.$k$3$H$K$h$j$+$J$j$^$@<h$j$3$\$7$,$"$j$^$9(B
$B$,!"$=$l$G$b(B17%$BDxEY$G$9!#$^$?!"8mG'<1$5$l$?%a!<%k$O%a!<%j%s%0%j%9%H$X(B
$B$N%3%^%s%I%a!<%k$G$7$?!#(B

SpamAssasin$B$N$h$&$JM-L>$J%=%U%H%&%'%"$G%k!<%k%Y!<%9$H%Y%$%8%"%s%U%#%k(B
$B%?$rAH$_9g$o$;$F#43d$b<h$j$3$\$9$N$OHs>o$K6=L#?<$$$N$G$9!#$I$N$h$&$J(B
$B%a!<%k$r<h$j$3$\$5$l$?$N$+!"$I$N$h$&$J%a!<%k$,8mG'<1$5$l$?$N$+!"3X=,(B
$B%G!<%?$NNL!"=hM}7k2L$J$I<($7$F$$$?$@$1$k$H;29M$K=PMh$F$&$l$7$$$N$G$9(B
$B$,!"$*;~4V$,$"$j$^$7$?$i@'Hs$h$m$7$/$*4j$$$7$^$9!#(B

-- 
Tomohiko Nakano
mailto:tomohiko@dd.iij4u.or.jp
mailto:tomohiko@nakl.t.u-tokyo.ac.jp
