I-ROC Curves kanye ne-AUC
Ijika le-ROC lihlela ukuthi umenzi wezigaba uwahlukanisa kanjani amakilasi amabili kuwo wonke umkhawulo wesinqumo ongase ube khona, futhi i-AUC icindezela lelo jika lonke libe inombolo eyodwa.
Uhlolojikelele
Together they tell you ranking quality independent of where you draw the cutoff.
I-Deep Dive
Ijika Lokusebenza Kwesamukeli (ROC) lihlela Izinga Leqiniso Elihle (ukuzwela, ku-axis ka-y) ngokumelene Nezinga Elihle Amanga (ukucaciswa kokukhipha okungu-1, ku-eksisi ka-x) njengoba uslayida umkhawulo wokuhlukanisa ukusuka ku-1 wehle uye ku-0. Umkhawulo ngamunye unikeza iphuzu elilodwa; ukuzihlanganisa kulandelela ijika. Imodeli elinganisa konke okuhle ngaphezu kwayo yonke i-negative ingala ekhoneni eliphezulu kwesokunxele. I-Area Under the Curve (AUC) ikala indawo ephelele engaphansi kwalo mugqa, kusukela ku-0.5 (ukuqagela okungahleliwe, i-diagonal) kuya ku-1.0 (ephelele). Ukuhumusha okuwusizo: I-AUC ilingana namathuba okuthi imodeli ithole iphozithivu ekhethwe ngokungahleliwe ngaphezu kwenegethivu ekhethwe ngokungahleliwe. Igama livela kubaqhubi be-radar beMpi Yezwe II abahlukanisa isignali nomsindo.
I-Technical Insight
I-AUC ayizimele ngoba ihlanganisa ukusebenza kukho konke ukunqanyulwa, ngakho-ke ayithintwa lapho ubeka khona umngcele wesinqumo. Ilingana ngokwezibalo nezibalo ze-Mann-Whitney U kanye nokuhlolwa kwerenki ye-Wilcoxon, okusho ukuthi kuncike kuphela ekuhleleni izinga lezikolo ezibikezelwe, hhayi amanani awo aphelele. Lokhu kuyenza izinze ngaphansi kokuguqulwa kwamaphuzu we-monotonic kodwa futhi ingazweli ekulinganisweni: imodeli ebekwe kahle kodwa engalinganiswanga kahle isengathola i-AUC ephezulu.
I-Strategic Impact
Izinqumo ezicacile
Kukusiza ukuthi uhlukanise izimangalo ezicacile zobuchwepheshe kusukela olimini lokumaketha.
Izindleko kanye nesabelomali
Ungabuza imibuzo yokusebenzisa kangcono ngaphambi kokusebenzisa imali noma isikhathi.
Ithimba kanye nokusebenza komsebenzi
Amaqembu anokuqonda okwabiwe enza izinqumo ezingcono zomkhiqizo, inqubomgomo, nokufunda.
Ikusasa le-ROC Curves kanye ne-AUC
I-ROC-AUC isalokhu iyimethrikhi yokubika ezenzakalelayo, kodwa odokotela bayanda ukuyibhangqa namajika we-Precision-Recall ukuze uthole idatha engalingani kakhulu, lapho i-ROC ingabukeka inethemba elikhohlisayo. Lindela ukwamukelwa okubanzi kwe-AUC eyingxenye (egxile esifundeni esinamanga aphansi esibalulekile ekusebenzeni), ukuhlaziya okubucayi nejika lesinqumo, kanye nokubika kwe-AUC yeqembu ngalinye ezikhaleni zokulunga. Njengoba amamodeli ephakela izinqumo zangempela, amamethrikhi okulinganisa ne-AUC azobikwa ngokuhambisana kune-AUC yodwa.
Ukuqaliswa Komhlaba Wangempela
Ukuqhathanisa amamodeli amabili okuthola ukukhwabanisa kwebhange nge-AUC yalo ukuze likhethe leyo elinganisa kahle kakhulu imisebenzi yomgunyathi ngaphezu kwaleyo esemthethweni.
Ukuhlola ukuhlolwa kokuxilonga kwesifo (isb., isigaba sokuhlola umdlavuza) lapho ama-radiologists kudingeka ahwebe ukuze abambe amacala amaningi ngokumelene nama-alamu angamanga
Ukushuna umkhawulo wesihlungi sogaxekile usebenzisa ijika le-ROC ukuze ugcine amaphuzu angamanga (imeyili esemthethweni imakwe njengogaxekile) iphansi kakhulu
Ukulinganisa imodeli yamaphuzu esikweletu-okuzenzakalelayo lapho i-AUC ifingqa ukuthi ibahlukanisa kahle kanjani ababolekayo ababuyisayo kulabo abahlulekayo.
Izingozi & Guardrails
Amaqembu ahlukene angasebenzisa igama elifanayo ngokuhlukile, ngakho chaza ububanzi kusenesikhathi.
Amabhentshimakhi angabukeka eqinile kuyilapho ukusebenza komhlaba wangempela kungalingani.
Ukuziba ikhwalithi yedatha nezinhlelo zokuhlaziya kuvame ukudala imiphumela entekenteke.
Ukuqalisa Umhlahlandlela
Qala ngencazelo yolimi olulula yomphumela oyidingayo.
Khetha imethrikhi eyodwa yempumelelo nesimo esisodwa sokuhluleka ngaphambi kokuhlolwa.
Qalisa umshayeli omncane onedatha emele, hhayi isethi yedemo ephucuziwe.
Idokhumenti lapho i-ROC Curves ne-AUC isiza khona nalapho izindlela ezilula zingcono.
Qhubeka Uhlole
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Umhlahlandlela olandelayo
I-Bias-Variance Tradeoff
Imibuzo evame ukubuzwa
What is ROC Curves and AUC?
Ijika le-ROC lihlela ukuthi umenzi wezigaba uwahlukanisa kanjani amakilasi amabili kuwo wonke umkhawulo wesinqumo ongase ube khona, futhi i-AUC icindezela lelo jika lonke libe inombolo eyodwa. Ndawonye bakutshela izinga lezinga elizimele lapho udweba khona umnqamulajuqu.
Yimaphi amanani amabili ijika le-ROC elihlela ngokumelene nawo?
Ijika le-ROC lihlela Izinga Leqiniso Elihle (ukuzwela) ku-axis ka-y ngokumelene Nezinga Elihle Lamanga (1 - ukucaciswa) ku-eksisi ka-x kuwo wonke ama-threshold.
Iliphi inani le-AUC elihambisana nesihlukanisi esingenzi kangcono kunokuqagela okungahleliwe?
Isihlukanisi esingahleliwe silandelela umugqa we-diagonal, enikeza i-AUC engu-0.5. I-AUC ye-1.0 iphelele, futhi u-0.0 isho ukuthi ithola zonke izinga ihlehle ncamashi.
Kungani i-AUC ichazwa ngokuthi 'i-threshold-independent'?
I-AUC ifingqa lonke ijika le-ROC, elikhiqizwa ngokushanela wonke umkhawulo, ngakho-ke ayincikile kunoma iyiphi i-cutoff eyodwa ekhethiwe.
Kudathasethi engalingani kakhulu, iyiphi ijika elivame ukutuswa eduze noma esikhundleni se-ROC ngoba i-ROC ingabukeka inethemba ngokweqile?
Ezinkingeni ezingavamile-ezinhle inani elikhulu lama-negative wangempela ligcina i-False Positive Rate iphansi, ikhuphula i-ROC. Amajika e-Precision-Recall agxila ekilasini elihle futhi aveze ukusebenza ngokwethembeka kakhulu.