Video: Dab tsi yog entropy hauv text mining?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Entropy yog txhais raws li: Entropy yog tus lej ntawm qhov tshwm sim ntawm txhua daim ntawv lo lub sij hawm lub cav qhov tshwm sim ntawm tib daim ntawv lo. Kuv tuaj yeem thov li cas entropy thiab siab kawg entropy nyob rau hauv cov nqe lus ntawm text mining ?
Cov lus nug tseem yog, dab tsi yog entropy hauv cov ntaub ntawv mining?
Entropy . Ib tsob ntoo txiav txim siab yog ua rau saum-down ntawm lub hauv paus ntawm thiab koom nrog kev faib cov cov ntaub ntawv rau hauv subsets uas muaj cov piv txwv uas muaj qhov zoo sib xws (homogenous). ID3 algorithm siv entropy los xam cov homogeneity ntawm tus qauv.
Tsis tas li ntawd, qhov twg yog qhov txhais ntawm entropy hauv kev kawm tshuab? Entropy , raws li nws hais txog tshuab kev kawm , yog ib qho kev ntsuas ntawm randomness nyob rau hauv cov ntaub ntawv raug ua. Qhov siab dua entropy , qhov nyuaj nws yog kos cov lus xaus los ntawm cov ntaub ntawv ntawd. Flipping ib npib yog ib qho piv txwv ntawm qhov kev txiav txim uas muab cov ntaub ntawv uas yog random. Qhov no yog lub ntsiab lus ntawm entropy.
Tib neeg kuj nug, qhov twg yog lub ntsiab lus ntawm entropy hauv kev txiav txim siab ntoo?
Nasir Islam Sujan. Plaub Hlis 29, 2018 · 5 min nyeem. Raws li Wikipedia, Entropy hais txog kev tsis sib haum xeeb lossis tsis paub tseeb. Txhais : Entropy yog kev ntsuas ntawm impurity, tsis meej pem los yog tsis paub tseeb nyob rau hauv ib pawg ntawm cov piv txwv.
Yuav ua li cas koj xam entropy thiab nce?
Cov ntaub ntawv tau txais yog xam rau kev sib cais los ntawm rho tawm qhov hnyav entropies ntawm txhua ceg los ntawm thawj entropy . Thaum cob qhia Kev Txiav Txim Tsob Ntoo siv cov kev ntsuas no, qhov kev sib cais zoo tshaj plaws yog xaiv los ntawm kev ua kom tiav Cov ntaub ntawv tau txais.
Pom zoo:
Dab tsi yog qhov txhais ntawm entropy hauv kev txiav txim siab ntoo?
Entropy: Ib tsob ntoo txiav txim siab yog tsim los ntawm lub hauv paus ntawm lub hauv paus thiab koom nrog kev faib cov ntaub ntawv rau hauv cov khoom sib txuas uas muaj cov piv txwv uas muaj txiaj ntsig zoo sib xws (homogeneous). ID3 algorithm siv entropy los xam cov homogeneity ntawm tus qauv
Dab tsi yog qhov yuav tsum tau ua ntawm pawg hauv cov ntaub ntawv mining?
Cov kev cai tseem ceeb uas ib pawg algorithm yuav tsum txaus siab yog: scalability; soj ntsuam nrog ntau hom cwj pwm; nrhiav pom pawg nrog arbitrary zoo; yam tsawg kawg nkaus rau kev paub sau npe los txiav txim qhov kev nkag tsis tau; muaj peev xwm daws cov suab nrov thiab outliers;
Dab tsi yog pawg tsom xam hauv cov ntaub ntawv mining?
Clustering yog txheej txheem ntawm kev ua ib pab pawg ntawm cov khoom paub daws teeb meem rau hauv cov chav kawm ntawm cov khoom zoo sib xws. Cov ntsiab lus nco ntsoov. Ib pawg ntawm cov ntaub ntawv cov khoom tuaj yeem raug kho raws li ib pawg. Thaum ua pawg soj ntsuam, peb thawj zaug faib cov ntaub ntawv rau hauv pawg raws li cov ntaub ntawv zoo sib xws thiab tom qab ntawd muab cov ntawv sau rau pawg
Dab tsi yog data mining thiab dab tsi tsis yog data mining?
Cov ntaub ntawv tsuas yog ua tiav yam tsis muaj kev xav ua ntej, yog li cov ntaub ntawv los ntawm cov ntaub ntawv tsis yog los teb cov lus nug tshwj xeeb ntawm lub koom haum. Tsis yog Cov Ntaub Ntawv Mining: Lub hom phiaj ntawm Cov Ntaub Ntawv Mining yog kev rho tawm cov qauv thiab kev paub los ntawm cov ntaub ntawv loj, tsis yog kev rho tawm (tsuas yog) ntawm cov ntaub ntawv nws tus kheej
Entropy cov ntaub ntawv nce yog dab tsi?
Cov ntaub ntawv nce = ntau npaum li cas Entropy peb tshem tawm, yog li Qhov no ua rau kev nkag siab: Cov ntaub ntawv ntau dua 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