Evaluating Strategies for Similarity Search on the Web Taher H. Haveliwala Aristides Gionis Dan Klein Piotr Indyk Stanford University Stanford University Stanford University MIT Computer Science Department Computer Science Department Computer Science Department Laboratory of Computer Science Stanford, CA 94305-9040 [email protected] (650) 723-9273 Stanford, CA 94305-9045 [email protected] (650) 723-4532 Stanford, CA 94305-9040 [email protected] (650) 725-6965 Cambridge, MA 02139-3594 [email protected] (617) 452-3402 ABSTRACT !""#$%&'("#)*,+.-#%/,! 021 '("4357689"4(&:"#%7.8;&: .<=>&?@#%A"#;7 BDCFEG#(@H/ =IJ%#7"!AEK$:L#:%AM=N"#4"O JPQ# 1 '(GAR35$+?-#S< ->;&!G#7"EKTE"'-!" ./M- %#DJ-!>(U>:%EKS:%:;(''V/LPW L'("#XJ%#7G/ % ;5&X- J9:Q%AG#;@A 0 B BSPWT- W "#7&@#76@B9Y >#%.T ;7 (+?-Z=[#Z->&*";A"''/\E'-!G J%#7G -% YR #7G#;@(S9%-;@\T]:R^V#;@#%/.S<\'_";`"= -%#,=NA>!";@a:BFYR 'V/b(,E'-!Gc&?'/d ,&VUR=W>.;- &.D##%?7GYJ%#7GS(;'-!>( -%X"=eU?ASf" ;7 "#%Og@U>AS:!L' a?BYZ>%;- %T#'_GEK E.7h"!*>E".7i=8 )EG#(- Q >#K";@hU?O "& AfB$!''V/.SfPi>%;#:XAPF @j;.'V/R;J%#- ; %&'("#VH/b!>Uk->*=-#*;7 %dJ%#7GSD l>#GE>(> "& '#%-'h=_#&m->#)( UfB Keywords #'_GAc!"S%(&'("#Vn/c%A"#;78SD%AG#;@<SE'- "<S4]: ^#;#%/M3o#GpJ; 1. INTRODUCTION qi'Q"=iOg!"`%&'("#VH/\%A"#;74L''APr-%# s!!R\!"$%&'_G#$L+.- #%/t LuVvAwGxyBMznY "#%;O -'("#ASEKM`+.- #%/,>.;- &.AS>T%(&'("#Vn/>Og%AG#;@M'"#V & %-'_>#"E?()#7" aKA`'J $=8>.;- &.I%&('(G#Q!G >.;- &?AB { EKR`%&*''9?- &Z:#W=I%&'("#VH/?Og%A"#;7LJ%#7"S< &? &*(\;&!G# | V#,#'("EKY+?- 'VH/bPW}-%# =[A>!;7a:BI~APiE#AS>- %#hJ- h;A"M GE%s ;A.);JW( :"`&W!X#%-#;BeM#GEK@#AS?=nS? JA`=<;& "# k%&*''?-&X:#,=TSPi\"#\?@#JAc;&!G#%O `!G#7&%#A*&?iPWVM'("#4!G#7&#W% ;S ?-&X:#=hJ%#7GT;AY+.- ;@a?'V/RU>;tPW!G$;A\:`E'VO - "A\- % -%#TJ-!>(B zn\($%V-!G8SoVT$U?%#&'V/ oK VW5AH*oDHKK?AgHR",nKXeH VAKQ"7 VKT.AKK.n VA KKiQH"egg"yAAAAAA ¡ K>AgH`GZ`QRQJ.HD¢o7n7HJZ.7VV7IHK V £ K>AgHT"iQJG5gg"y¤A¤7¤@¥¦KTW§` VHAn¨_¢IH7nJ QHK.nW.7VV7IHK V © K>AgH`GZ`QRQJ.HD¢o7n7HJZ.7VV7IHK V Copyright ªlªlª «>¬is¬"held « by the author/owner(s). , May 7–11, 2002, Honolulu, Hawaii, USA. 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( U,%D"# EKts -#*vGw.BqiT+?-#%/>#.;%% ,JL>&!GA ./4 i;JI=f";;%% ç!SQ%&*''#I= iOn%a4!>U>B q9T&#GEK):#%=N"#&* ;S.Pi)s!'V#Aî çZ$#&GEKW-#'i"='AP !># 0 ´"#Z=[Pi#X ' a?76@B×D!GT%*-#'$#&* K æYSe%R!G`"''h-#'`;A"b" :AG#*X+.- #1 dh%&*%(&'V/ ù= ú KKH VgH V7V R û:HK$KnA?7gH V)¨oHK L Û ¡C`b I$KAJVKZAHG S¨_HAâµHKAnX¨ ?7 t VH%HAg"åLQ äG\Kb H VAK HnAKH cK7n7H VKQ ã ùX VKH7n VKx ã ú¸5AKVZ>WKHAKn HAå s VãAAH nKâÂgH KJn VA¨f.ã¨_JãAâ4GH Q §`HãA Vã¨<KJKAg2.ã¨_JãAâ4GH § 2H VãA.nKnhãA77HH VA ü Kg v H"7nH VKã 9>h¨fKJ o Vâ4 1yAKH AKH ' AKH ýt¦n7AK . b 7ZH?AH nAn Å yGA§r.ãAc Aâ4Kn7nH"Æ ¤7A$uþ §`HãAX.ãA y! 4uþ § 2n VãA.nKH Æ 1y$uþ 2"äGgH§ 2H VãAÅ .ÿ nKn7 w. n7n"Æ Æ 4uþ Å Å oPpqO5Z?r"EG ] ¤_ N þOp~5Z.qR ó! þRx< uOY0ZvqR ¾pZ PW''o "4:A"#(|Í%à@Ç ç Ó È2ÇBX]D=I;->#%`"4*%'.4;#A%X( +.-#%/`& 0 "#hEK &#W#%->#;76@Sç` A,h:)s!'V#A ¯(*Ph/.BFCD'%| "R ",VQ = çk( &*.7 bPW '('V/d( &*"Og&&#%/ 0 ?/l "#%V | ";#%,%EK#7"'&*";@(S =[#(J7;G6@S $+.- #%/ #.;%%((&>#)*X=_#7; "=IX%;!fB 7.2 Quality of Retrieved Documents C);;->#7"Q;&!G#% 8PWTU>J %"#;7Z 5"#h>V=[O s ;- 'VASI% ;, A>ZR&*aK*%-># :"|J/J&Z-%, "&LPi.;- &.*;'(';@(8B°R!AEKL=[- ¯ APiEK#AS "o 1 '_GA`35"%®=[- ;@(!"'(Vn/`=f;&&#;("'>%"#;7 W=[M#-#RÊ:)É AÐ !KÉÈ2ÐyÆÊ!ÉÓNÓ è"S!"W :%A,,ÈgÆ S!ÐyËÉÓ[Ó èS %&'("#)#%- 'VBe "#W(J7;S 808+8B{>1j(0/ BLW?/*%&4;#VO #()%(&'("#ok B/)1"&.(&1',0$"*¸8B>51j(0/CB<Bhqi/T"#i:"X "#%5"= M;#%=_iLÃ?l × dGGPQEK#8 I=N#&@#9Pi- '($ :QWEK#%/4-%O =[- '5#%-'=N#$%&X'.a? =N#$" #s!!" ;("'5%BZY ;'_"&µ!GQD-%D"=8-#QE"'-!" &?'(/ e'(*- i- %W"=fJ%#7"(e!G5#¹!;ei "=Wn%&('(G#n/>® &X:?A4$ Q: -'_G#I]^43RV#;@#%/.B5#5''- J%#7"8SPQ AEKW#GE?_>A`%&W"& ')+?-#Q`s -#$vA´?BozH`s -#4vÕ PQ$!AEK4EK vÙXPi"#7 0 ?/,Pi(.@6WMT )=[# %$+.- #%/,->#'(B Û ¤ eå REFERENCES 10. s â4 JGå n VKã á Aâ4â4A ?nnm" ! VK"In2KGH ¨(ZnK þ7g v KHJ t n7n Vn VAZ¨<fHãA% b t "7â47Gn@å '3 !P'"#$7&%E!'(9#)5' *,+ ) -.!/"' 3!##'01# 321'4 !Å0%065 "7 s s c¤7AAå n HHK c å.QKVc.KZ5å?.gH K Nå?oKn7 á nãAAH 987n VA"TA"njm7å /',:%;%;%0c!¤7AAå ¦>å7þH VTK: 9å v ãAAå.oK s KHAâ)Z¨<:HãA%g7V >gHj m"H. b *7nJ`KãA VKAå /!,%;%;%&<Cc ¤7AAå y1 s Î å þn77åKf V n7n VKãI7n2KKV V7H t "Kâ4"n@å '3 =?>A@c¤7AAå s Î å þn77å THKW¢oHâKWK á AGJ VKâ4GQ¨ t Kâ4GH7åBiB')7$"#';'C;B')7 .! + DE3F7"c ¤7AAå s Î å þn7 c.§Må á KH V c s åK.H VG 8 c.KX§Må.§` 87â$JK@å §` VNI VHe2KK?7K" v HâDHH VAK7å /!,HIKJÅc ¤7AAå ¥ s Î å þn7 c?>å.QHnâ$ c.§MåK§.Hn5 cKKDCå L?5 VãKå "GHn V á Vnn7n VKã¨fnK b å /'Z:%;%;%NMCc ¤7AG¥å >å á ."J.gH c¸þQå t Aó â cK v åK2K?Oå 9.K >gHj m" á n7ãAAn9 87H VA H VKã >nV VK7å /!, QP;JQRc ¤7AAå >å á ."J.gH c¸þQå t Aó â c v å.¢eãA.äA c?å.¢I6 SHãAAK c c?K: TKOå UiV V?HãKå s nAâ$H Vi¢IHAH t å?Q VKnA á Aâ4 VH VAT" s . V 8 VKã >nV VKZ"HnK%HHWK s Hn n`:j m7å /',:%;%;%N<Cc!¤7AAå ¤7 eå á AK c>§Må t H c>?åK.( Sg oJ0 c s å.Q VAK V c v å2K. c ¢WåK§`2oK cCTKå VVâ$ cK á Vå W9KãKå.f VK VKã2GHHgH VKã s Hn n VAKoe nKAiK>Ag v HK VKãKå '3 'XRYc7 AAAå ¤A ¤ 3þQå t ä VnA å.:AK V7X !"7V 2T VZnK b 7å /', :cÎ AAAå /¤ ZT.å t 7`KX§Må 8 VKãA7å.f VKK VKã¢In7 v ãAI VZnK b AnV b VK b å /',:%;%;%0c!¤7AAå ¤7¦ 9å s å?Q"Kâ$XK b å O å UiHHNåK§`7HKn7o¨ HH" H VAZ¨[AoHAnInH w.7n VAK@Xå [V\P)e]3\XR'^\ _ /(\cÎyGV 7 ¥'¦ "`¥1 y+c:¤7A1 yKå ¤ y1DWå å 7äGV o0 c s å?Q VAK V c.K v åK2K>å>"@V :7HKK9 a"Ke¨_A á Vnn7n VKãnK b Bå "' x' /!Z Då Î-/ 7'#'7' %E''9#)5'îV&%b(5Z!CcRZ'45#"$d c¸ AAAå VJ cK>åK¢eãA.äAc å?in7 2§`AV V.0cK s å v ?JAAå b Îþ5n 7 s ¢I?AH nAnT¨ b v ãA@å /!, Î-/ 7'#'7' %E' f% g&%b(5GB'"#$7cÎ AAAå ¤7 v å2K>å s â$V§` V"I Vni2KK?KK"i?â4 V 4¨ n .KK%H VA@å /'ZH/JQRFPc¤7AAå ¤@¥ s å UO å TG V cK§Må.eJH Vâ4KD§`Kg25 c.K v å TKåKf K å t J 7Vnn7n VKã 7 s n%ä V%W7å 3XP B! )CF9cBF9#26 + cK¦¤ 5¦ Æc Å ¤7AAå ¤7ZT.O å UiV7 V"?HãKå s nKAH HH äGWnAKHe VZG?HV VA7 7Gä VHAKâ4G@å ',/JQR)c ¤7AAå ¤7 9 å !Aå?§`7HHe¨ t VnnH VKn VA.! Vâ4 VH 2>å ' b3ihEc¤7AAå A å v å KK å.oK s nAâ$H V á H7n VAX/¨ ! nJnKH å eKPj[F9 7'«H13#'m!CcR?"26 G)7ZÎc s KgHHn@C V7V¤7A" `?¤7 A0 c:¤7AAå ¤ > t VH%HAg v H6 Sn% utev Æ%V å kll(m/n^oo"ppp/q!r3sOt6uvq$w(t#sOoå Å ¨_Ae0 lnmX"nH VK VKãKå '']x ' §Må v Ann@å s s VãAAH nKâ %065#RHe 8. 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