Ziwerengero mu Chiphunzitso cha Masewera
Chiphunzitso cha masewera ndi nthambi ya masamu yomwe imaphunzira kupanga zisankho zanzeru pamene zotsatira za wosewera m'modzi zimadalira zochita za osewera ena. Chimagwiritsidwa ntchito kwambiri mu zachuma, bizinesi, sayansi yandale, sayansi ya makompyuta, komanso biology ya kusintha kwa zinthu. Komabe, m'machitidwe, zochitika zanzeru sizimakhala "zomveka bwino" ndipo zimatha kuwerengedwa mokwanira kuchokera ku lingaliro la kulingalira bwino. Apa ndi pomwe ziwerengero zimagwira ntchito yofunika kwambiri: kuthandiza kuyeza kusatsimikizika, kuyerekeza khalidwe la otsutsa, kuwunika momwe njira zikuyendera, ndikuyesa ngati chitsanzo cha chiphunzitso cha masewera chikugwirizana ndi deta yeniyeni.
1. N’chifukwa chiyani chiphunzitso cha masewera chikufunika ziwerengero?
Mu zitsanzo za chiphunzitso cha masewera akale, nthawi zambiri timapatsidwa chidziwitso chokwanira: mndandanda wa osewera, njira, ndi phindu (phindu/zotayika) pa kuphatikiza kulikonse kwa njira. Ndi chidziwitsochi, titha kupeza mayankho monga Nash equilibria, njira zolamulira, kapena mayankho a minimax. Komabe, m'dziko lenileni, zinthu izi nthawi zambiri sizimadziwika motsimikiza:
1. Kulipira sikudziwika kapena kovuta kuyeza. Mwachitsanzo, pa mpikisano wamitengo pakati pa makampani, kulipira si nambala yokhazikika, koma kumadalira kufunikira kwa msika, ndalama zopangira, malonda, ndi zinthu zina zakunja.
2. Khalidwe la osewera nthawi zina silikhala lanzeru kwenikweni. Osewera amatha kulakwitsa, kukhala ndi chidziwitso chochepa, kapena kukhala ndi tsankho la maganizo.
3. Deta yomwe yawonedwa ndi yachisawawa komanso yaphokoso. Tingaone mbiri ya zochita ndi zotsatira zake zokha, osati zomwe timakonda kwenikweni.
4. Chilengedwe chimasintha. Njira zabwino kwambiri masiku ano zitha kusagwira ntchito bwino mawa chifukwa cha kusintha kwa mfundo, ukadaulo, kapena zomwe zikuchitika.
Ziwerengero zimapereka zida zothanirana ndi kusatsimikizika kumeneku: kuyambira pa kuyerekeza, kuyerekezera, kulosera, mpaka kuphunzira kuchokera ku deta (chiphunzitso cha masewera choyendetsedwa ndi deta).
2. Kuyerekeza njira ya osewera ndi "chikhulupiriro"
Mitundu yambiri yamasewera imaphatikizapo zikhulupiriro zokhudza zochita za mdani. M'masewera obwerezabwereza kapena masewera a Bayesian, osewera ayenera kuyerekeza:
- mwayi wa mdani kusankha njira inayake,
– mtundu wa mdani (monga “wankhanza” kapena “wogwirizana”),
- kusintha komwe kungachitike pa njira ya mdani pakapita nthawi.
Apa ndi pomwe mfundo za kuthekera ndi ziwerengero zimayambira. Mwachitsanzo, ngati mdani asankha njira A nthawi 60 mwa ma raundi 100, kuyerekezera kosavuta kwa kuthekera ndi 0,6. Komabe, ziwerengero zimalola njira yowunikira bwino:
- Nthawi zodzidalira poyesa kusatsimikizika kwa kuyerekezera.
- Ma model a Bayesian (monga Beta priors a kuthekera kwa zochita) kuti ziyerekezo zikhale zokhazikika pamene deta ili yochepa.
- Ma model a Markovian kapena ma model a Markov obisika (HMM) pofotokoza otsutsa omwe akusintha pakati pa "njira zanzeru," mwachitsanzo, kuchokera ku mgwirizano kupita ku mpikisano.
Mwa kuwerengera kugawa kwa zochita za mdani, wosewera akhoza kupanga njira yolondola kwambiri yoyankhira.
3. Ziwerengero mu masewera omwe alibe chidziwitso chokwanira (masewera a Bayesian)
Mu masewera a Bayesian, osewera sadziwa magawo ofunikira—monga ndalama, kuwerengera, kapena zomwe otsutsa amakonda—koma ali ndi kugawa kwa mwayi kuposa magawo amenewo. Chitsanzo chabwino kwambiri ndi kugulitsa: aliyense amene akutenga nawo mbali ali ndi kuwerengera kwachinsinsi kwa chinthu chomwe chikugulitsidwa, ndipo kugawa kumeneku kungaphunziridwe kuchokera ku deta yakale.
Ziwerengero zimagwira ntchito pa zinthu ziwiri zazikulu:
1. Yerekezerani kugawa kwa mitundu ya osewera. Pogwiritsa ntchito deta yam'mbuyomu yogulitsa (mitengo ya zotsatsa, opambana, mitengo yomaliza), titha kuyerekeza kugawa kwa mtengo wa omwe akutenga nawo mbali.
2. Sinthani chitsanzocho. Kodi chitsanzo cha malonda cha "mtengo woyamba" kapena "mtengo wachiwiri" chikugwirizana bwino ndi momwe deta imagwirira ntchito? Tikhoza kuyerekeza zitsanzo pogwiritsa ntchito kuthekera, AIC/BIC, kapena kutsimikizirana.
Motero, lingaliro la mgwirizano wa Bayesian si yankho la chiphunzitso chokha, komanso lingalumikizidwe ndi deta ya umboni.
4. Kuyesa kwa malingaliro olakwika mu khalidwe lanzeru
Chiphunzitso cha masewera nthawi zambiri chimaneneratu: mwachitsanzo, mumasewera ogwirizana, osewera amasankha mfundo zinazake zofanana. Ziwerengero zingagwiritsidwe ntchito kuyesa ngati maulosi awa ndi olondola mu zoyeserera za labotale kapena deta yamunda.
Mwachitsanzo, mu masewera a Mkaidi, chiphunzitso chakale chimaneneratu kuti kuthawa ndiye njira yofunikira kwambiri. Komabe, mu zoyeserera, anthu ambiri amagwira ntchito limodzi pazochitika zingapo. Ziwerengero zimathandiza kuyankha funso ili:
- Kodi mgwirizano ndi wapamwamba kwambiri kuposa momwe chiphunzitso chimanenera?
- Ndi zinthu ziti zomwe zimawonjezera mgwirizano (zolimbikitsa, kulankhulana, chilango)?
- Kodi kusiyana kwa chikhalidwe kapena magulu kumakhudza zotsatira zake?
Njira zomwe zimagwiritsidwa ntchito nthawi zambiri zimaphatikizapo mayeso a proportion, mayeso a chi-square, logistic regression , ndi ma mixed-effects models a deta yobwerezabwereza.
5. Ma modelo a regression ndi econometric a phindu ndi njira
Mu bizinesi ndi zachuma, phindu nthawi zambiri limakhudzidwa ndi zinthu zosiyanasiyana. Mwachitsanzo, phindu la kampani silidalira mitengo yosankhidwa ndi kampani ndi omwe akupikisana nawo okha, komanso ndalama zomwe ogula amapeza, nyengo, ndalama zoyendetsera zinthu, ndi kukwezedwa.
Ziwerengero zimapereka zida monga:
- Kubwerera m'mbuyo kwa mzere/kosakhala mzere kuti kulumikiza njira ndi zotsatira.
- Chitsanzo cha deta ya gulu kuti muyerekeze makampani osiyanasiyana pakapita nthawi.
- Zosintha za zida pakakhala vuto la chifukwa ndi zotsatira (endogeneity), mwachitsanzo, mtengo umakhudzidwa ndi kufunikira komanso umakhudza kufunikira.
Ndi zitsanzo zachuma, tikhoza kuwerengera "ntchito zolipira" zenizeni, kenako n’kuphatikiza ziwerengerozo mu kusanthula kwa chiphunzitso cha masewera.
6. Kuphunzira m'masewera: kuyambira pa deta mpaka njira
Mu nthawi ya deta ndi makompyuta, chiphunzitso cha masewera nthawi zambiri chimalumikizana ndi kuphunzira kwa makina . Zochitika zambiri zamakono—monga kutsatsa kwa digito, malingaliro amitengo yosinthasintha, kapena chitetezo cha pa intaneti—zimakhudza osewera kuphunzira kuchokera ku deta.
Mfundo zina zofunika zomwe zimaphatikiza ziwerengero ndi chiphunzitso cha masewera ndi izi:
– Chigawenga chokhala ndi zida zambiri: wothandizira amasankha zochita kuti azitha kufufuza bwino (kufunafuna chidziwitso) ndi kugwiritsira ntchito molakwika (kuwonjezera phindu).
- Kuphunzira kolimbikitsa (RL): othandizira amaphunzira njira zabwino kwambiri kudzera mu kuyesa ndi kulakwitsa m'malo omwe angakhudze othandizira ena.
- Kuphunzira pa intaneti m'masewera: ma algorithms monga kuchulukitsa zolemera kuti akwaniritse zofanana m'masewera obwerezabwereza.
Mwachidule, ziwerengero zimagwiritsidwa ntchito kusintha ziwerengero kutengera zomwe zawonedwa, pomwe chiphunzitso cha masewera chimathandiza kumvetsetsa momwe zinthu zimagwirira ntchito pakati pa othandizira kuphunzira.
7. Kuyeserera kwa Monte Carlo poyesa njira
Masewera nthawi zambiri amakhala ovuta kwambiri kuti asanthulidwe mwachisawawa. Mwachitsanzo, masewera okhala ndi osewera ambiri, malo akuluakulu a njira, kapena njira zovuta zobwerezabwereza. Pazochitika izi, zoyeserera zimapereka mlatho wamphamvu.
Njira za Monte Carlo zimagwiritsidwa ntchito:
- kutsanzira zochitika zambiri za zochita za otsutsa,
- kusatsimikizika kwa magawo a chitsanzo,
- yesani kugawa kwa zotsatira za njira (osati mfundo zomwe zimayembekezeredwa zokha).
Ndi kuyerekezera, titha kuwunika zoopsa: njira A ikhoza kukhala ndi phindu lalikulu koma kusiyana kwakukulu, pomwe njira B ndi yokhazikika. Kusankha njira kumadalira zomwe osewera amakonda pa chiopsezo.
8. Mapulogalamu enieni: kuyambira pa malonda mpaka chitetezo cha pa intaneti
Kuphatikiza kwa ziwerengero ndi chiphunzitso cha masewera kumawonekera m'magawo otsatirawa:
1. Kugulitsa zinthu pa intaneti: kutsanzira khalidwe la opereka ndalama, kulosera ndalama zomwe amapeza, ndi kupanga njira zogulitsira zinthu.
2. Mpikisano wa mitengo: kuyerekezera momwe opikisana nawo amachitira ndi kusintha kwa mitengo pogwiritsa ntchito deta yakale.
3. Chitetezo cha pa intaneti: kutsanzira owukira ndi oteteza ngati osewera; ziwerengero zimagwiritsidwa ntchito pozindikira kulowerera ndi kuyerekezera kuthekera kwa kuukira.
4. Biology ya chisinthiko: njira zopulumukira ndi kubereka zimasanthulidwa ngati masewera; deta ya anthu imagwiritsidwa ntchito poyesa zitsanzo za chisinthiko.
5. Ndondomeko za boma: mikangano pakati pa magulu imasanthulidwa mwanzeru; deta ya kafukufuku ndi zoyeserera za ndondomeko zimathandiza kuyerekeza zomwe anthu amakonda komanso mayankho.
9. Mavuto ndi zolepheretsa
Ngakhale kuti ndi yamphamvu, kugwiritsa ntchito ziwerengero mu chiphunzitso cha masewera kumakumana ndi mavuto angapo:
– Zofooka za deta: deta yanzeru ikhoza kukhala yochepa kapena yosakwanira.
- Vuto lozindikira: mitundu yosiyanasiyana imatha kufotokoza deta yomweyi.
– Khalidwe lovuta la anthu: zinthu zamaganizo, miyambo ya anthu, ndi malingaliro n'zovuta kuziphatikiza mu zitsanzo zosavuta za masamu.
– Kusintha kwa ulamuliro: njira ndi malo zitha kusintha kotero kuti mitundu yakale siilinso yofunika.
Chifukwa chake, njira yabwino kwambiri nthawi zambiri imaphatikiza chiphunzitso, deta, zoyeserera, ndi zoyeserera.
Mapeto
Ziwerengero ndi chiphunzitso cha masewera zimathandizirana. Chiphunzitso cha masewera chimapereka njira yomvetsetsa kuyanjana kwa njira, pomwe ziwerengero zimapereka zida zowerengera magawo, kuphunzira khalidwe kuchokera ku deta, kuyesa kulosera kwa chitsanzo, ndikuwongolera kusatsimikizika. Mu dziko lenileni la chidziwitso chosakwanira komanso kusintha kwa kayendetsedwe ka zinthu, kuphatikiza kumeneku kumakhala kofunikira kwambiri. Mothandizidwa ndi ziwerengero, kuyerekezera, ndi kuphunzira kwa makina, chiphunzitso cha masewera si chida chongoganizira chabe komanso njira yothandiza yopangira njira zogwira mtima, mfundo, ndi machitidwe m'malo opikisana komanso ogwirizana.
Ngati mukufuna, nditha kuwonjezera chitsanzo chosavuta cha manambala (monga masewera okonza mitengo a makampani awiri) kapena kuphatikiza mndandanda wa maumboni/mabuku ndi maumboni a m'magazini kuti ndilimbikitse nkhaniyo.
