Video: Dab tsi yog qhov sib npaug qub?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Ib txwm sib npaug yog kev sib npaug tau los ntawm kev teeb tsa sib npaug zos rau xoom cov derivatives ib nrab ntawm cov lej ntawm squared yuam kev (tsawg squares); ib txwm sib npaug tso cai rau ib tug los kwv yees qhov tsis tau ntawm ib tug ntau linear regression.
Xav txog qhov no, dab tsi yog qhov sib npaug qub hauv linear regression?
Ib txwm sib npaug yog ib qho analytical mus kom ze Linear Regression nrog tus nqi qis tshaj Square. Peb tuaj yeem nrhiav ncaj qha rau tus nqi ntawm θ yam tsis siv Gradient Descent. Ua raws li txoj hauv kev no yog qhov ua tau zoo thiab kev xaiv txuag lub sijhawm thaum ua haujlwm nrog cov ntaub ntawv nrog cov yam ntxwv me me.
Tsis tas li ntawd, dab tsi yog qhov sib npaug hauv kev kawm tshuab? Ib txwm sib npaug . Qhov no yog ib qho txheej txheem rau xam coefficients rau Multivariate Linear Regression. qhov teeb meem tseem hu ua OLS Regression, thiab Ib txwm sib npaug yog ib txoj hauv kev los daws nws. Nws pom cov regression coefficients analytically. Nws yog ib kauj ruam kev kawm algorithm (as opposed to Gradient qhovntsej thiaj tsis mob)
Ib sab saum toj no, dab tsi yog qhov sib npaug li niaj zaus?
Ib txwm sib npaug . Muab ib tug matrix kev sib npaug . tus ib txwm sib npaug yog qhov uas txo qis qhov sib npaug ntawm qhov sib txawv ntawm qhov sib txawv ntawm sab laug thiab sab xis: Nws yog hu ua a ib txwm sib npaug vim yog ib txwm mus rau thaj tsam ntawm.
Dab tsi yog qhov sib npaug qub hauv kev soj ntsuam?
Kev txhais ntawm ib txwm sib npaug .: ib txheej ntawm ib txhij kev sib npaug koom nrog kev sim tsis paub thiab muab los ntawm ntau qhov kev soj ntsuam kev sib npaug nyob rau hauv chav kawm ntawm tsawg-squares hloov ntawm kev soj ntsuam.
Pom zoo:
Yuav daws qhov tsis sib npaug ntawm cov kab sib npaug thiab cov kab sib npaug sib npaug li cas?
Kev daws qhov tsis sib npaug ntawm qhov sib npaug yog zoo ib yam li kev daws cov kab sib npaug. Qhov sib txawv tseem ceeb yog koj tig lub cim tsis sib xws thaum faib lossis muab faib los ntawm tus lej tsis zoo. Graphing linear inequalities muaj ob peb qhov sib txawv ntxiv. Qhov uas yog qhov ntxoov ntxoo muaj xws li qhov tseem ceeb uas qhov kev tsis sib xws ntawm cov kab tawm muaj tseeb
Dab tsi yog qhov txawv ntawm qhov sib txawv ntawm qhov sib txawv thiab qhov sib txawv ntawm qhov ntab?
Integers thiab floats yog ob yam sib txawv ntawm cov ntaub ntawv tus lej. Ib tus lej (feem ntau hu ua anint) yog tus lej tsis muaj tus lej lej. Float isa floating-point number, uas txhais tau hais tias nws yog tus lej uas muaj tus lej lej. Floats siv thaum xav tau ntau dua
Qhov sib npaug sib npaug rau qhov nruab nrab ntawm h2so4 los ntawm Koh yog dab tsi?
Hauv daim vis dis aus no peb yuav sib npaug ntawm qhov sib npaug KOH + H2SO4 = K2SO4 + H2O thiab muab cov coefficients raug rau txhua qhov sib xyaw. Txhawm rau sib npaug KOH + H2SO4 = K2SO4 + H2O koj yuav tsum nco ntsoov suav tag nrho cov atoms ntawm txhua sab ntawm cov tshuaj sib npaug
Puas yog txhua qhov sib npaug sib npaug sib npaug?
Thawj qhov sib npaug sib npaug yog qhov tseeb yog tias nws muaj kev txuag kom muaj nuj nqis. Piv txwv li, qhov sib npaug sib cais yeej ib txwm muaj tseeb, txij li lub ntsiab lus lawv yog ntawm daim ntawv: M(y) + N(t) = 0, yog li ϕ(t, y) = A(y) + B(t) yog a khaws cia kom muaj nuj nqis
Dab tsi yog qhov sib txawv ntawm cov kab lus sib npaug thiab qhov sib npaug sib npaug?
Cov kab lus sib npaug muaj qhov muaj txiaj ntsig zoo ib yam tab sis tau nthuav tawm nyob rau hauv ib hom ntawv sib txawv uas siv cov khoom ntawm cov lej xws li ax + bx = (a + b) x yog cov kab lus sib npaug. nruj me ntsis, lawv tsis yog 'sib npaug', yog li peb yuav tsum siv 3 kab sib luag hauv 'sib npaug' es tsis yog 2 raws li qhia ntawm no