Cov txheej txheem:
- eigenvectors qhia peb li cas?
- Cov eigenvectors qhia dab tsi hauv PCA?
- Vim li cas peb thiaj siv eigenvectors?
- Qhov txawv ntawm eigenvalues thiab eigenvectors yog dab tsi?
Video: Eigenvectors qhia li cas?
2024 Tus sau: Fiona Howard | [email protected]. Kawg hloov kho: 2024-01-10 06:38
Vim cov Eigenvectors qhia kev taw qhia ntawm lub ntsiab lus tseem ceeb (txoj haujlwm tshiab), peb yuav muab cov ntaub ntawv qub los ntawm eigenvectors kom rov taw qhia peb cov ntaub ntawv mus rau lub axes tshiab. Cov ntaub ntawv rov taw qhia no yog hu ua tus qhab nia.
eigenvectors qhia peb li cas?
Tshuaj teb. Eigenvectors ua nkag siab txog kev hloov pauv yooj yim. Lawv yog cov "axes" (kev taw qhia) raws li ib tug linear transformation ua tsuas yog los ntawm "stretching / compressing" thiab / los yog "flipping"; eigenvalues muab rau koj cov xwm txheej uas qhov compression tshwm sim.
Cov eigenvectors qhia dab tsi hauv PCA?
Lub eigenvectors thiab eigenvalues ntawm kev sib txawv (lossis kev sib raug zoo) matrix sawv cev rau "core" ntawm PCA: Cov eigenvectors (cov khoom tseem ceeb) txiav txim siab cov lus qhia ntawm qhov chaw tshiab feature, thiab cov eigenvalues txiav txim siab lawv qhov loj.
Vim li cas peb thiaj siv eigenvectors?
Eigenvalues thiab eigenvectors cia peb "txo" kev ua haujlwm tawm kom sib cais, yooj yim dua, teeb meem Piv txwv li, yog tias muaj kev ntxhov siab siv rau "yas" khoom, qhov deformation tuaj yeem muab faib ua "cov lus qhia tseem ceeb" - cov lus qhia uas qhov deformation loj tshaj.
Qhov txawv ntawm eigenvalues thiab eigenvectors yog dab tsi?
Eigenvectors yog cov lus qhia uas ib qho kev hloov pauv hloov pauv los ntawm flipping, compressing lossis stretching. Eigenvalue tuaj yeem raug xa mus rau raws li qhov lub zogntawm kev hloov pauv hauv cov kev taw qhia ntawm eigenvector lossis qhov tseem ceeb los ntawm qhov compression tshwm sim.
Pom zoo:
Tsis qhia lossis qhia?
Qhia yog qhov tshwm sim, txheej txheem ua tiav. "Koj tsis tau taught kuv"=Koj ua tsis tiav thaum qhia kuv. Los yog vim koj style nqus los yog vim kuv tsis mloog. Qhov no kuj txhais tau tias koj tsis tau sim, thaum "tsis qhia"
Vim li cas kev qhia ntawv tseem ceeb hauv kev qhia?
Contextualization txhais tau tias yog siv cov khoom ntawm cov lus hauv lub ntsiab lus tseem ceeb thiab cuam tshuam. Qhov no pab cov neeg kawm kom tau txais kev txawj ntse thiab kev paub tshiab Nws kuj txhim kho lawv lub peev xwm thiab tus cwj pwm.
Vim li cas cov neeg nthuav qhia siv cov kev pab nthuav qhia?
Presentation aids pab cov neeg mloog kom nkag siab ntau ntxiv txog tus neeg hais lus ua ob txoj hauv kev: lawv pab qhia meej thiab lawv pab qhia. Cov kev pab nthuav qhia tuaj yeem pab cov neeg tuaj saib kom nkag siab txog cov tswv yim nyuaj lossis cov txheej txheem thiab tseem tuaj yeem qhia tias cov tswv yim twg tseem ceeb tshaj plaws hauv kev hais lus .
Puas eigenvectors ib txwm muaj kev ywj pheej?
Eigenvectors sib haum rau cov eigenvalues txawv yog linearly ywj siab. Raws li qhov tshwm sim, yog tias tag nrho cov eigenvalues ntawm lub matrix yog qhov txawv, ces lawv cov eigenvectors sib raug zoo hla qhov chaw ntawm kab vectors uas cov kab ntawm cov matrix koom .
Puas kev qhia qhia suav nrog kev qhia?
Yog, nws ua Puas kev qhia ntawv suav nrog kev ua haujlwm? Yog, kev qhia ntawv, txawm tias koj tau ua nws ntiag tug lossis los ntawm lub tuam txhab qhia ntawv yog "ua haujlwm." Yog li koj yog tus nqi kom suav nrog nws hauv koj qhov kev xav tau.
