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AAAI Technical Report , 1995 PowerPoint PPT Presentation


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Context -Free Language Induction by Evolution of Deterministic Push -Down Automata Using Genetic Programming. AAAI Technical Report , 1995. Motivación. ¿Es posible caracterizar los distintos servicios sobre HTTP?

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AAAI Technical Report , 1995

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Aaai technical report 1995

Context-Free LanguageInductionbyEvolution of DeterministicPush-Down AutomataUsingGeneticProgramming

AAAI TechnicalReport, 1995


Motivaci n

Motivación

  • ¿Es posible caracterizar los distintos servicios sobre HTTP?

    • Características intrínsecas: inter-arrival, tiempo sesión, tamaño, numero de paquetes, etc.

      • Evita el problema de HTTPS

      • No distingue un BLOG de una pagina corporativa

    • Análisis del Payload

      • Keywords

      • Expresiones Regulares  (pero es un trabajo difícil)


Motivaci n1

Motivación

  • GET / HTTP/1.1Accept: */*Accept-Language: esUA-CPU: x86Accept-Encoding: gzip, deflateUser-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; GTB5; .NET CLR 1.0.3705; .NET CLR 1.1.4322; Media Center PC 4.0)Host: es.yahoo.comConnection: Keep-AliveCookie: B=ef4mqrp4627ou&b=4&d=NJm9QoRpYFIXrfiI5nANQ5nNqNvzOFebQOyogA--&s=fk; YLS=v=1&p=1&n=0; F=a=AvfjeagMvTCzapwlVOCqQYufGNVnW6kv_pOcmaQWbUj9wySpihlCbdvOCunZAa826QMBbYs-&b=fwY.; Y=v=1&n=8cjt3gsiv1vle&l=j0hj8hjeh/o&p=m2hvves013000000&iz=11170&r=fl&lg=es-ES&intl=es; PH=fn=5IdutZBmwfFxRP5pw8v8WWEkwov5&l=es-ES; C=mg=1; CP=v=70202&br=i&pc=none&tguid=2974030eb8dba03785fcfef1304146b9&optclk=0; U=mt=1_1233522630_695737_mudd&ux=aDhhJB&un=8cjt3gsiv1vle; T=z=v8UrJBvQ8vJBET8UtwtoBbsNTJPBjYzTzZPNk43MDU-&a=YAE&sk=DAAaCRt12hbQKc&ks=EAAc3Oehx5e8d1wlZRjMp9eow--~C&d=c2wBTWpVNEFURTBPREU0TVRrd056SS0BYQFZQUUBZwFWVjZMR1ZQQzdNWFdZUFYzQlgzVkwzVFFTNAFvawFaVzAtAXRpcAFSOUNCbEMBenoBdjhVckpCQTdF; SP=v=1&a=1; sBL=1; Q=q1=AACAAAAAAAAAAA--&q2=Sa13cQ--; [email protected]@1HTTP/1.1 200 OKDate: Mon, 09 Mar 2009 08:04:41 GMTP3P: policyref="http://info.yahoo.com/w3c/p3p.xml", CP="CAO DSP COR CUR ADM DEV TAI PSA PSD IVAiIVDiCONiTELoOTPi OUR DELiSAMiOTRiUNRiPUBi IND PHY ONL UNI PUR FIN COM NAV INT DEM CNT STA POL HEA PRE LOC GOV"X-UA-Compatible: IE=8Cache-Control: max-age=0, privateExpires: Mon, 09 Mar 2009 08:04:41 GMTConnection: closeTransfer-Encoding: chunkedContent-Type: text/html; charset=UTF-8Content-Encoding: gzipc35f v'?&")anL|_Q4ZAhMih=youi4(95kD4v}"9YRk4=|l>[email protected]|=Vln|Ve?x8cX0^>i;mGx1_fiuRLe5i'kFu\d\pt"FyOk,~D;DbIg4y_|T{1Iz0d1_I2.YJF3,yQ,_YOfd^$;Ex+|Bog</U=g5{%H9fu%7?9>pEhbE.7Zg 9|'yjnATOxrV7c%Y=@||e3 smty5_ijd&/V$2j_f_42Y\d!Vk4 -,:dpv<o_y3vg z4oz?W{jr~{{S/VY&xs| D=>.wh*~_i<NnNFzljIwM0Kx.e/nzyt~Ox}riwOx`5/F5_/MRi/Oj_O>9<?WPMGDg~72)Oo{{y3X0?~][[p<{"?\~)#dwYz=:)ss}p?._dzh5wuZ,&~-\<?xzYE/ejvn.?|Yr/?\&k~2OU5T%H5yhBo!a/@]zMO$+ [et>(|vzg+Q\z]i-o4P=}p;){ggEXQk}&G&-2O0Lun_^%|?}K~5IE=!sRv-gI~X&`3iwbhp`X7UhwK!L2V}o6.Z.7nU>%foA#_gTwhhd{^~|< 8G`HyA~dYw^;o'/^ezS`(1IG\\0?Qzl"T~Q/Ypj(%|eS8hg\6Hg|}=g49$.i_Qe%E&=|}pRr?.,7ihj..[email protected]\\x$ewX; U}|gmw4>6:_T@<{lA>LGxBsk{O;g/Ng2X'_tA"sL}5K>Cp<Y4q{Nps))upK`/&Wwe`teQ86j.ddu:RI2$d}-^$InlO!k|6)~XC9>5O3y=>bFpG^,pKIS$ yA'+D0lB#zE-)O|@>x<Wpy+%:D/0r6"(=(f5 8)hv@$x_&`@?Lz&wN?++[epxx_0Dfg$QBG6U"X5d -p!XP`46RqI?6SE5m'[gb]q_E=#[2XO~v`>#DW/K{o}jIww%/=RXB9VXe>U~m6?R**Uc3M(0ru(_..HjG]#m<ZTW((:3sX~ew5_"(tkX{M1T7YWtcs^v9Ei<kW ^-1)!dbNzI&}]_e=Z<{~~yvYw}i:WWxgCy/?o.1.xImO\t?nyf>*A7`}"Bn7uFg[}1+KOdh1x.9RnR6}y`Ih.a%^]Dh>gRK~*|Zrz!#P z'h_[wLNb>6?/-1qP. kAO]_^4=]20&d:QN3Ti)Fd.\k~N!Ob{85li;]`2AUm}&,)qn5M?!(y@,_Z1[IVMRNvrLTsij_-O?|'dO>Qdwt8L<[Ga(&xL?}?x}6\4VYjhs|=l?K"=-$t^y>+}5yHh}bg<VIi|HEr1L-h:[email protected]>yIT\5AWAxMw@"w_Siwy20D1a|F3`DN~Is7lshPA}i;C&49Hn2S{6Kg=p+#!z~M~SjRx>HsNB+H~}{4#2bTKgF;hEgh}0;=O/xHDt?wz+;[email protected]~|]F" Znbd-7c^3#{[WG,0h(btAA"[[bL3.X%??N>\2k)!GPa;!uM%qy9tJ.pukg/;pH.w$)M8iZpT2 [email protected]=G(h~Dj,^"[email protected]/i|"DI%Ndq:kR@<kAuqR_[>Vj?Sl1g@^.-Cn^JTh@=5;[email protected][email protected]$+1|A:!2[rx$}W]?sH"$0'WG7%vb0Z-6yM[AR!z7=h&EMI=M3=9|?4*&c";%'P=r%[OV?QU}#O?!_#?vMJb/PK/!d^b^IrJXX+,\[email protected]~C"/<Y}oMclRlBqF:9d;qO@>v."=*O#|y[j0y&_mCHxLPpzj0 :[email protected]@zFfW-TvETjdhB_-r3hqmBD;'H5|BQ|d=|Pa%6'EBLG+SE^<c5_jLyaD_+T hXTuD}@_Z{\'+X6EuuVosu8*1!ueqH'+=$=! 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Motivaci n2

Motivación

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Introducci n

Introducción

  • ¿Podemos crear un autómata que clasifique estas cadenas en aceptadas o rechazadas? Yahoo/no-yahoo?

  • ¿Podemos inferir estos autómatas de las propias cadenas?

    • Hill Climbing

    • Neural Nets

    • GeneticProgramming


Donde estamos

Donde estamos?

  • Lenguajes regulares

    • Expresiones Regulares

  • Lenguajes Independientes del Contexto

    • Español, C++, Java

  • Lenguajes dependientes del Contexto

    • Aleman Suizo

  • Lenguajes recursivamente enumerables


Genetic programming

GeneticProgramming

  • Se crean N programas “aleatorios”

    • Dentro de unos limites

  • Se evalúa su ajuste al resultado esperado

  • Los supervivientes son cruzados y mutados

  • Se repite hasta que el ajuste es suficientemente bueno


Apdal

APDAL

  • Lenguaje para la descripcion de PDA

    • Basado en las operaciones básicas

    • Enlace hacia atrás

    • Funciones: Read, Pop, Push, Dec

    • Sintaxis tipo LISP para ejecución simple


Conclusiones

Conclusiones

  • Resultados muy variable, dependen de:

    • Los datos de prueba

    • Probabilidades de mutación/cruce

    • Población en cada generación

  • 1995->Mejora de la capacidad RAM/CPU

  • Para problemas numéricos o de clasificación existen frameworks

  • ExpresionesRegulares-> Perl -> PerlGP


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