Izitolo ezifakiwe
Isitolo sesici siyisistimu emaphakathi ehlanganisa, igcine, futhi inikeze okokufaka okuhlukile (izici) ezisetshenziswa amamodeli okufunda omshini.
Uhlolojikelele
It exists to guarantee that the exact same feature values are used during training and during live prediction, eliminating a notorious source of silent model failures.
I-Deep Dive
Amamodeli awafundi kudatha eluhlaza; bafunda ezicini ezifana 'nenani elijwayelekile lokuthenga ezinsukwini ezingu-30' noma 'isikhathi kusukela ekungeneni kokugcina.' Ngaphandle kwesitolo sesici, ithimba elilodwa libala labo abasemgqeni wokuqeqesha bese elinye liwafaka kabusha ngekhodi yokukhiqiza, futhi okubili kuyahlukana ngokuhlukana, inkinga ebizwa ngokuthi i-training-serving skew. Isitolo sesici sixazulula lokhu ngezendlalelo ezimbili ezivumelanisiwe: isitolo esingaxhunyiwe ku-inthanethi (inqolobane yedatha ephethe umlando weminyaka yokuqeqeshwa) kanye nesitolo se-inthanethi (isizindalwazi esisheshayo senani lokhiye esinikeza izici ngama-millisecond ngezicelo ezibukhoma). Zombili zigcwele izincazelo ezifanayo zesici. Amaqembu aphinde athole ikhathalogi eyabelwe ukuze izici ezakhelwe imodeli eyodwa zitholwe futhi ziphinde zisetshenziswe enye, kanye nokunemba kwephoyinti ngesikhathi okuvimbela ukuqeqeshwa ngephutha kudatha kusukela esikhathini esizayo.
I-Technical Insight
Inkinga enzima kakhulu exazululwa yisici sesitolo ukuhlanganisa ngesikhathi. Lapho wakha isethi yokuqeqeshwa, kufanele unamathisele amanani ezici njengoba ayenjalo ngesikhathi somcimbi ngamunye ongokomlando, hhayi amanani awo amanje, noma imodeli ifunda ekuvuzeni kwedatha. Isici sigcina isitembu sesikhathi kuwo wonke amanani futhi senze ukujoyina njenge-off ngokumelene nesitolo esingaxhunyiwe ku-inthanethi. Isitolo esiku-inthanethi, ngokuvamile i-Redis noma i-DynamoDB, siphethe kuphela inani lakamuva ngokhiye webhizinisi ngamunye wokubheka okungaphansi kwe-millisecond eyi-10 ngesikhathi sokunquma.
I-Strategic Impact
Izindleko kanye nesabelomali
Izinqumo zezakhiwo ziqhuba ukusebenza kanye nezindleko zokusebenza iminyaka.
Izinqumo ezicacile
Imfundo yobuchwepheshe isiza amaqembu ukuthi akhethe isitaki esifanele, hhayi nje esisha.
Ukulawulwa kwekhwalithi
Izinketho ezingcono zobunjiniyela zinciphisa izehlakalo ezinokwethenjelwa ekukhiqizeni.
Ikusasa Lezitolo Zesici
Izitolo zesici zihlangana nesitaki sedatha esibanzi: eziningi manje zifaka izici ngokuqondile ngaphakathi kwezindawo zokugcina idatha kunokugcina amapayipi ahlukene. Isikhathi sangempela nezici zokusakaza ezibalwa ngekhompyutha zisuka ekusakazweni komcimbi phakathi nemizuzwana ziba yizinga lokukhwabanisa nokwenza kube ngokwakho. Lindela ukuhlanganiswa okujulile nesizindalwazi se-vector njengoba ukushumeka kuba izici zesigaba sokuqala, nokuhlanganiswa okuqinile nokuqapha imodeli ukuze isici sokukhukhuleka sitholwe ngokuzenzakalelayo. Kuphinde kube nokuphushela 'kuzingxenyekazi zesici' ezihlanganisa incazelo, ukukhonza, ukuqapha, kanye nokubusa kusendlalelo esisodwa esiphethwe.
Ukuqaliswa Komhlaba Wangempela
Inkampani ekhokhayo igcina izici ze-transaction-velocity zamahora angu-24 esitolo se-inthanethi ukuze imodeli yayo yokukhwabanisa ikwazi ukuthola ukuswayipha ngaphansi kwama-millisecond angu-10.
Isevisi yokusakaza-bukhoma ichaza 'isikhathi sokubuka izinsuku eziyi-7 zokugcina' kanye esitolo sesici, bese siphinda sisisebenzisa kuwo wonke amamodeli anconyiwe, ama-churn, namamodeli okuhloswe ngawo izikhangiso.
Inkundla yokuboleka isebenzisa ukujoyina kwephoyinti-in-time ukuze kwakhiwe idatha yokuqeqeshwa, iqinisekisa ukuthi isinqumo ngasinye semalimboleko sibona kuphela izici zomfakisicelo ezaziwa ngaphambi kwaleso sinqumo.
Uhlelo lokusebenza lwe-ride-hailing lunikeza izici zesikhathi sangempela zokuhlinza nezici zokutholakala komshayeli kusukela kumugqa wesici sokusakaza-bukhoma kuya kumodeli yokuqagela ye-ETA.
Izingozi & Guardrails
Ukuthuthukisa ibhentshimakhi eyodwa kungafihla ubuthakathaka obubanzi besistimu.
Izindleko zengqalasizinda nezokulungisa zivame ukubukelwa phansi.
Izikhala zokuphepha nokubonakala zingakhula njengoba izinhlelo ziba nzima kakhulu.
Ukuqalisa Umhlahlandlela
Chaza ukubambezeleka, ikhwalithi, nezindleko ezihlosiwe ngaphambi kokuqaliswa.
Ibhentshimakhi ngaphansi komthwalo wangempela nezimo zedatha.
Ukuqapha amathuluzi amaphutha, ukukhukhuleka, nomthelela wabasebenzisi.
Lungiselela izindlela zokuhlehlisa nezigameko ngaphambi kokukala.
Qhubeka Uhlole
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Umhlahlandlela olandelayo
I-Linear Probing kanye Nokuhlola Isici Esiqandisiwe
Imibuzo evame ukubuzwa
What is Feature Stores?
Isitolo sesici siyisistimu emaphakathi ehlanganisa, igcine, futhi inikeze okokufaka okuhlukile (izici) ezisetshenziswa amamodeli okufunda omshini. Ikhona ukuze kuqinisekiswe ukuthi amanani esici afanayo ncamashi asetshenziswa phakathi nokuqeqeshwa naphakathi nokubikezela okubukhoma, kuqedwa umthombo owaziwayo wokuhluleka kwemodeli ethule.
Iyiphi inkinga eyinhloko isitolo sesici esiyixazululayo ngokuyinhloko?
Ngokwenza ikhompuyutha izici ezisuka ezincazelweni ezabiwe kanye nokusebenzisa amanani afanayo kukho kokubili ukuqeqeshwa nencazelo, izitolo zesici zisusa ukungaboni ngaso linye phakathi kwakho kokubili.
Uyini umehluko phakathi kwezitolo ezingaxhunyiwe ku-inthanethi neze-inthanethi?
Isitolo esingaxhunyiwe ku-inthanethi sigcina umlando weminyaka yokwakha amasethi okuqeqesha, kuyilapho isitolo esiku-inthanethi siyisizindalwazi esibambezeleka kancane esinikezela ngamavelu ezici zamanje ngesikhathi sokubikezela.
Kungani ukujoyina kwephoyinti-ngesikhathi kubalulekile lapho wakha idatha yokuqeqeshwa?
Ukusebenzisa amanani amanje esikhundleni sawomlando kuvumela imodeli ukuthi 'ibone ikusasa,' ikhuphule ukunemba okungaxhunyiwe ku-inthanethi kodwa kwehluleke ekukhiqizeni. As-of joins lungisa lokhu.
Iluphi uhlobo lwesizindalwazi oluvame ukusetshenziswa esitolo se-inthanethi?
Ukukhonza ku-inthanethi kudinga ukubhekwa kwe-sub-10-millisecond ngokhiye webhizinisi, ngakho-ke ukushesha kwememori okungaphakathi noma izitolo zamanani wokhiye we-NoSQL ziyizinketho ezijwayelekile.
Siyini 'isici' kulo mongo?
Izici amasignali okokufaka acutshunguliwe imodeli ewasebenzisayo, ngokuvamile ukuhlanganiswa noma ukuguqulwa kwedatha eluhlaza kunedatha eluhlaza ngokwayo.