5.3.1 Netflix Prize

The Netflix Prize amagwiritsa kuitana lotseguka kulosera mafilimu anthu mukufuna.

The bwino kwambiri kudziwika lotseguka kuitana ntchito ndi Netflix Prize. Netflix ndi Intaneti kanema yobwereka kampani, ndi 2000 anapezerapo Cinematch, utumiki amalangiza mafilimu makasitomala. Mwachitsanzo, Cinematch mungaone kuti ankakonda Star Nkhondo ndi Ufumu Zokhoma Back ndiyeno Mungachite penyani Kubweranso kwa Jedi. Poyamba, Cinematch ntchito bwino. Koma, m'kupita kwa zaka zambiri, Cinematch anapitiriza luso lake kulosera zimene mafilimu makasitomala akasangalala. Ndi 2006 Komabe, patsogolo pa Cinematch plateaued. The ofufuza pa Netflix anali ayesetsa wokongola kwambiri akanapeza, koma pa nthawi yomweyo, iwo amaganiziridwa kuti panali mfundo zina zimene zingawathandize bwino kachitidwe kawo. Choncho, iwo anabwera zimene zinali, pa nthawi yothetsera kwakukulu: kuitana lotseguka.

Ovuta bwino yotsatira ya Netflix Prize mmene kuitana lotseguka udaikidwa ndi mamangidwe ali zofunika momwe mafoni lotseguka angagwiritsidwe ntchito kafukufuku chikhalidwe. Netflix sanangobwera adafuthula pempholi unstructured nzeru, zomwe ndi zimene anthu ambiri kulingalira pamene kaye kuitana lotseguka. M'malo mwake, Netflix anafunsa vuto bwino ndi muyezo yosavuta kuunikaku: iwo adalimbikitsanso ntchito ya 100 miliyoni filimu mlingo kulosera 3 miliyoni unachitikira kunja mlingo (mavoti kuti owerenga anapanga koma Netflix sanali kumasula). Aliyense amene akanakhoza kulenga aligorivimu kuti akhoza kuneneratu 3 miliyoni unachitikira kunja mavoti 10% kuposa Cinematch zikuwayendera madola 1 miliyoni. Izi bwino ndiponso yosavuta kugwiritsa ntchito yayendera i-kuyerekeza mlingo ananeneratu kuti unachitikira kunja mlingo-zinatanthauza kuti Netflix Prize anali anakonza njira yoti njira savuta fufuzani kuposa kupanga; Mwamwayi vuto bwino Cinematch mu vuto oyenera kuitana lotseguka.

Mu October wa 2006, Netflix anamasulidwa ndi gulu lazidziwitso munali 100 miliyoni filimu mlingo kuyambira pafupifupi 500,000 makasitomala (tikambirana tanthauzo zinsinsi za izi kumasulidwa deta mu Chapter 6). deta Netflix akhoza conceptualized monga bokosi lalikulu kuti pafupifupi 500,000 makasitomala ndi 20,000 mafilimu. Mkati masanjidwewo, panali pafupifupi 100 miliyoni mlingo pamlingo kwa nyenyezi 1 mpaka 5 (Table 5.2). vuto linali kugwiritsa ntchito deta anati mu masanjidwewo kuneneratu miliyoni 3 unachitikira kunja mavoti.

Ofufuza ndi hackers padziko lonse kukopeka vuto, ndi 2008 anthu oposa 30,000 anali ntchito, (Thompson 2008) . M'kupita mpikisanowo, Netflix analandira oposa 40,000 njira akufuna ku magulu oposa 5,000 (Netflix 2009) . Mwachionekere, Netflix kuwerenga ndiponso kumvetsa njira zonse izi akufuna. Chinthu chonsecho anathamanga bwino Komabe, chifukwa njira zinali zophweka kuti aletse. Netflix ndikanangokhala ndi makina a anayerekezera mlingo ananeneratu kuti inkachitira kunja mavoti ndi chisanadze mwachindunji chinkafunika (a chinkafunika makamaka iwo ntchito chinali muzu lalikulu la zolakwa zikutanthauza-mbali zonse). Iwo anali kuchita zimenezi mwamsanga kuunikira njira zimene zinathandiza Netflix kuvomereza njira kwa aliyense, zimene zinathandiza kuti ndi yofunika kwambiri chifukwa maganizo anapindula malo ena zodabwitsa. Ndipotu njira pampikisanowu anali umene gulu anayamba ofufuza atatu kuti analibe isanafike zinachitikira nyumba filimu umboni kachitidwe (Bell, Koren, and Volinsky 2010) .

Womwe kwabwino kwa Netflix Prize n'chakuti zinathandiza aliyense mu dziko ndi njira zawo ayesedwa mwachilungamo. Pamene anthu adakweza mavoti awo analosera, iwo sayenera kukweza makalata awo maphunziro, msinkhu, mtundu, jenda, chokhudza nkhani yogonana, kapena chirichonse za iwo okha. Choncho, mlingo ananeneratu za pulofesa wotchuka ku Stanford ankapatsidwa chimodzimodzi monga anthu ochokera wachinyamata kuchipinda kwake. Mwatsoka, zimenezi sizoona mu kafukufuku ambiri chikhalidwe. Ndiko kuti, kufufuza kwambiri chikhalidwe, kuwunika ndi nthawi yambiri ndi pang'ono a m'maganizo. Choncho, maganizo kwambiri kufufuza osati kwambiri ayesedwa, ndi pamene malingaliro amene ayesedwa, n'zovuta detach mawunikidwe kwa a mlengi wa maganizo. Chifukwa njira ndi wosavuta onani, kuyitana lotseguka kulola akatswiri kupeza njira zonse zomwe zingakhale zodabwitsa amene amagwa mwa ming'alu akadakhala ankaona njira kwa aphunzitsi otchuka.

Mwachitsanzo, pa nthawi ina pa munthu Netflix Prize ndi dzina chophimba Simon Funk kuikidwa pa ake Blog njira akufuna zochokera chimodzi mtengo kuwonongeka, ndi njira kwa ajebura liniya kuti anali atazolowera kale ndi ophunzira ena. Funk a blog, nsanamira anali imodzi luso ndi weirdly mwamwayi. Zimenezi positi Blog kufotokoza njira yabwino kapena anali akungotaya nthawi? Kunja ya polojekiti lotseguka kuitana, njira Atseka alandira Titaiganizira. Ndipotu Simon Funk sanali pulofesa ki Chatekinoloje kapena MIT; iye anali mapulogalamu mapulogalamu amene, nthawi, anali backpacking padziko New Zealand (Piatetsky 2007) . Ngati iye anali adatumiziridwa maimelo mfundo imeneyi kwa katswiri pa Netflix, izo pafupifupi ndithu akanapatsidwa zocheza.

Mwamwayi, chifukwa i kuwunika zinali zomveka bwino ndiponso yosavuta kugwiritsa ntchito, mlingo wake ananeneratu anali ayesedwa, ndipo inali nthawi yomweyo bwino kuti ulaliki wake anali amphamvu kwambiri: iye rocketed malo chachinayi mu mpikisano, chifukwa kwambiri kupatsidwa kuti magulu ena anali kale ntchito kwa miyezi ndi vutolo. Pomaliza, mbali ya njira Simon Funk anali ntchito pafupifupi onse mpikisano aakulu (Bell, Koren, and Volinsky 2010) .

chakuti Simon Funk anasankha kulemba blog positi kufotokoza njira yake, osati kuyesera kuti chinsinsi, komanso zikusonyeza kuti ophunzira ambiri mu Netflix Prize sanali yekha chimalimbikitsa mphoto miliyoni dollar. M'malomwake, ophunzira ambiri ankaoneka kuti asangalale ndi vuto nzeru ndi anthu ammudzi kuti anayamba kuzungulira vuto (Thompson 2008) , mmene ndimayembekezera akatswiri ambiri angathe kumva.

The Netflix Prize ndi chitsanzo cha kuitana lotseguka. Netflix anafunsa funso ndi cholinga chapadera (akuneneratu filimu mlingo) ndi anapemphedwapo njira kwa anthu ambiri. Netflix anatha kufufuza njira zonse izi chifukwa anali kosavuta kuti atsimikizire kuposa kulenga, ndipo pamapeto pake Netflix ndinatenga yabwino yothetsera. Kenako, ine ndidzakuwonetsa iwe bwanji njira yomweyi angagwiritsidwe ntchito zamoyo ndi lamulo.