Video: Entropy cov ntaub ntawv nce yog dab tsi?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Cov ntaub ntawv tau txais = npaum li cas Entropy peb tshem tawm, yog li ntawd
Qhov no ua rau kev nkag siab: siab dua Cov ntaub ntawv tau txais = ntau Entropy tshem tawm, uas yog qhov peb xav tau. Nyob rau hauv cov ntaub ntawv zoo meej, txhua ceg yuav tsuas muaj ib qho xim tom qab sib cais, uas yuav yog xoom entropy !
Tsis tas li ntawd, cov ntaub ntawv nce thiab entropy hauv kev txiav txim siab yog dab tsi?
Cov ntaub ntawv tau txais : Cov cov ntaub ntawv nce yog nyob ntawm qhov txo qis hauv entropy tom qab cov ntaub ntawv-set raug cais ntawm tus cwj pwm. Kev tsim kho a tsob ntoo txiav txim yog txhua yam hais txog kev nrhiav tus cwj pwm uas rov qab siab tshaj plaws cov ntaub ntawv nce (piv txwv li, feem ntau homogeneous ceg). Kauj ruam 1: xam entropy ntawm lub hom phiaj.
Ib yam li ntawd, entropy hauv cov ntaub ntawv yog dab tsi? Cov ntaub ntawv entropy yog qhov nruab nrab tus nqi uas cov ntaub ntawv yog tsim los ntawm ib tug stochastic qhov chaw ntawm cov ntaub ntawv . Qhov ntsuas ntawm cov ntaub ntawv entropy txuam nrog txhua qhov ua tau cov ntaub ntawv tus nqi yog qhov tsis zoo logarithm ntawm qhov tshwm sim loj muaj nuj nqi rau tus nqi: qhov twg yog qhov kev cia siab txhais los ntawm qhov tshwm sim.
Hauv qhov no, cov ntaub ntawv tau txais txhais li cas?
Cov ntaub ntawv nce suav qhov txo qis hauv entropy lossis surprise los ntawm kev hloov cov ntaub ntawv hauv qee txoj kev. Cov ntaub ntawv nce yog qhov txo qis hauv entropy lossis surprise los ntawm kev hloov cov ntaub ntawv thiab feem ntau siv rau hauv kev cob qhia cov ntoo txiav txim siab.
Dab tsi yog qhov txhais ntawm entropy hauv kev txiav txim siab ntoo?
Txhais : Entropy yog kev ntsuas ntawm impurity, tsis meej pem los yog tsis paub tseeb nyob rau hauv ib pawg ntawm cov piv txwv.
Pom zoo:
Cov ntaub ntawv hom thiab cov qauv ntaub ntawv yog dab tsi?
Cov qauv ntaub ntawv yog ib txoj hauv kev piav qhia txog ib txoj hauv kev los npaj cov ntaub ntawv kom ua haujlwm andalogrithms tuaj yeem siv tau yooj yim dua. Ib hom ntaub ntawv piav qhia txog cov ntaub ntawv uas txhua tus sib koom ua ke. Piv txwv li tus lej cov ntaub ntawv hom piav qhia txhua tus lej uas lub khoos phis tawj tuaj yeem ua tau
Dab tsi yog qhov txawv ntawm XML cov ntaub ntawv thiab cov ntaub ntawv sib txheeb?
Qhov sib txawv loj ntawm XML cov ntaub ntawv thiab cov ntaub ntawv sib txheeb Ib daim ntawv XML muaj cov ntaub ntawv hais txog kev sib raug zoo ntawm cov ntaub ntawv rau ib leeg nyob rau hauv daim ntawv ntawm hierarchy. Nrog rau tus qauv kev sib raug zoo, tib hom kev sib raug zoo uas tuaj yeem txhais tau yog cov lus niam txiv thiab cov rooj sib raug zoo
Dab tsi yog qhov sib txawv ntawm pab pawg cov ntaub ntawv thiab cov ntaub ntawv tsis yog pawg?
Ob leeg yog cov ntaub ntawv muaj txiaj ntsig ntawm cov ntaub ntawv tab sis qhov sib txawv ntawm lawv yog cov ntaub ntawv tsis muaj ntaub ntawv yog rawdata. Qhov no txhais tau hais tias nws nyuam qhuav tau sau tab sis tsis txheeb rau hauv ib pawg lossis cov chav kawm. Ntawm qhov tod tes, groupeddata yog cov ntaub ntawv uas tau teeb tsa ua pawg los ntawm cov ntaub ntawv nyoos
Vim li cas kem taw qhia cov ntaub ntawv khaws cia ua cov ntaub ntawv nkag ntawm disks sai dua li kab qhia cov ntaub ntawv khaws cia?
Kem oriented databases (aka columnar databases) yog qhov tsim nyog rau kev ntsuas kev ua haujlwm ntau dua vim tias cov ntaub ntawv hom ntawv (kem hom) qiv nws tus kheej kom nrawm dua cov lus nug ua - scans, aggregation thiab lwm yam. Ntawm qhov tod tes, kab oriented databases khaws ib kab (thiab tag nrho nws. kab) contiguously
Dab tsi yog cov teeb meem ntawm kev tswj cov ntaub ntawv hauv cov ntaub ntawv ib txwm muaj?
Nyob rau tib lub sijhawm, qhov kev tswj hwm cov ntaub ntawv ib puag ncig tsim teeb meem xws li cov ntaub ntawv rov ua dua thiab tsis sib xws, cov kev pab cuam-cov ntaub ntawv dependence, inflexibility, tsis muaj kev ruaj ntseg, thiab tsis muaj cov ntaub ntawv sib qhia thiab muaj