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From: Seigo Tanimura <tanimura@tanimura.dyndns.org>
To: FreeBSD-users-jp@jp.FreeBSD.org
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Date: Tue, 10 Jun 2003 18:15:26 +0900
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Subject: [FreeBSD-users-jp 74888] Re: spammers love jp.FreeBSD.org
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$BC+B<!s$3$3$O2?$N(B mailing list $B$J$s$@(B($B>P(B) $B$G$9!#(B

On Tue, 10 Jun 2003 16:15:09 +0900,
  Tomohiko Nakano <tomohiko@dd.iij4u.or.jp> said:

>> SpamAssassin $B$C$F!"(BNaive Bayes $B$G$7$?$C$1(B? $B@NJY6/$7$?$s$@$1$I!"$?$7$+=i(B
>> $B4|CM$H$7$F2?$i$+$N%Q%i%a%?$rM?$($J$$$H$$$1$J$+$C$?$h$&$J!#$G!"J,N`BP>]$,(B
>> $BJ#;($K$J$C$F$/$k$H!"=i4|CM$K$h$C$F$OJ,N`4o$rBg0hE*$K:GE,2=$G$-$J$$(B($B6I=j(B
>> $BE*$J:GE,2=$7$+$G$-$J$$(B)$B$s$G$9$h$M!#(B
>> 
>> $B$G!"$=$l$KBP$7$F$O!V=i4|CM$r$$$m$$$m?6$C$F$_$m!W$H$+$N$?$^$C$F$^$7$?!#3N(B
>> $B$+$K2r$OJQ$o$k$1$I!"$"$^$j$K%Y%?$J$d$jJ}$@$C$?$s$G!"4s$C$F$?$+$C$F%\%m%/(B
>> $B%=$K$$$C$F$?5-21$,$"$j$^$9$M!#(B

tomohiko> $B;d$N<j85$K$"$kK\!X(BData Mining Concepts and Techniques$B!Y(B(Jiawei Han, 
tomohiko> Micheline Kamber|Morgan Kaufmann)$B$K$h$l$P!"(BNaive Bayesian 
tomohiko> Classification$B$O<!$N$h$&$K@bL@$5$l$F$$$^$9!#(B

tomohiko> $BJ,N`BP>]%/%i%9$r(BC1, C2, C3, C4,,, Cm$B$H$9$k!#(B
tomohiko> X={x1, x2, x3, , , xn}$B$H$$$&;vNc$,@85/$7$?>l9g!"(B
tomohiko> P(Ci|X)>P(Cj|X) for 1<=j<=m, j!=i
tomohiko> $B$G$"$k$H$-$K!"(BX$B$r(BCi$B$KJ,N`$9$k!#(B

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


tomohiko> $B$3$N@bL@$G$O!"=i4|CM$d%Q%i%a%?$O$G$F$3$J$$$h$&$K;W$($k$N$G$9$,!"C+B<$5(B
tomohiko> $B$s$N$*$C$7$c$k=i4|CM!"%Q%i%a%?$H$O2?$r;X$7$F$$$i$C$7$c$k$N$+65$($F$$$?(B
tomohiko> $B$@$1$J$$$G$7$g$&$+!)(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

$B$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

-- 
Seigo Tanimura <tanimura@tanimura.dyndns.org> <tanimura@FreeBSD.org>
