Video: Qhov twg yog tus nqi sigmoid ua haujlwm asymptote?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Teb: Cov sigmoid muaj nuj nqi muaj ob kab rov tav asymptotes , y=0 and y=1. Cov muaj nuj nqi yog txhais ntawm txhua qhov ntawm x. Yog li nws tsis muaj ntsug asymptotic.
Yog li ntawd, dab tsi yog qhov tso zis ntau ntawm sigmoid muaj nuj nqi?
Sigmoid muaj nuj nqi yog siv ntau heev hauv neural networks. Ntawm ib sab, lub perceptron tso zis discrete 0 or 1 tus nqi, a sigmoid neuron tso zis ib tug ntau du los yog txuas ntxiv ntau ntawm qhov tseem ceeb ntawm 0 thiab 1. Nws yuav tsum muaj nyob rau hauv Neural Networks uas lub tso zis hloov maj mam nrog cov tswv yim.
Qhov thib ob, koj ua li cas hloov cov haujlwm sigmoid? 1/(1+e−(x−a)), qhov a yog tus nqi ntawm cov ua haujlwm . Qhov no yog tib yam li plotting x+a vs. 1/(1+e−x). Rau ua haujlwm ib yam muaj nuj nqi f (x), tsuas yog hloov txhua qhov tshwm sim ntawm x nrog (x−δ), qhov twg δ yog tus nqi uas koj xav tau ua haujlwm tus muaj nuj nqi.
Kuj paub, dab tsi yog sigmoid muaj nuj nqi siv rau?
Lub ntsiab yog vim li cas peb siv sigmoid muaj nuj nqi yog vim nws muaj nyob nruab nrab ntawm (0 txog 1). Yog li ntawd, nws yog tshwj xeeb siv rau cov qauv uas peb yuav tsum kwv yees qhov tshwm sim raws li qhov tso zis. Txij li qhov tshwm sim ntawm txhua yam muaj nyob nruab nrab ntawm qhov ntau ntawm 0 thiab 1, sigmoid yog txoj kev xaiv. Cov muaj nuj nqi yog txawv.
Dab tsi yog qhov ua haujlwm ntawm sigmoid asymptote?
Cov sigmoid muaj nuj nqi muaj ob kab rov tav asymptotes , y=0 and y=1. Step-by-step piav qhia: Sigmoid muaj nuj nqi yog muab los ntawm: f(x)=1/(1+e^(-x)) The muaj nuj nqi yog txhais ntawm txhua qhov ntawm x.
Pom zoo:
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Tab 7.6. Kev sib piv ntawm IEEE 802.11 Standards IEEE Standard RF Siv Cov Ntaub Ntawv Tus Nqi (hauv Mbps) 802.11a 5GHz 54 802.11b 2.4GHz 11 802.11g 2.4Ghz 54 802.11n 600/5GHz (theoretical 2.4GHz)
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