{"id":15649,"date":"2023-12-04T15:33:24","date_gmt":"2023-12-04T15:33:24","guid":{"rendered":"https:\/\/promoguy.nl\/vocabulary\/clusters\/"},"modified":"2023-12-04T15:33:24","modified_gmt":"2023-12-04T15:33:24","slug":"clusters","status":"publish","type":"entity","link":"https:\/\/promoguy.nl\/lt\/blog\/vocabulary\/clusters\/","title":{"rendered":"klasteriai"},"content":{"rendered":"<p>Klasterin\u0117 analiz\u0117 arba klasterizavimas - tai u\u017eduotis sugrupuoti objekt\u0173 rinkin\u012f taip, kad tos pa\u010dios grup\u0117s (vadinamos klasteriu) objektai b\u016bt\u0173 pana\u0161esni (tam tikra prasme) vienas \u012f kit\u0105 nei kit\u0173 grupi\u0173 (klasteri\u0173) objektai. Tai yra pagrindinis tiriamosios duomen\u0173 gavybos u\u017edavinys ir \u012fprastas statistin\u0117s duomen\u0173 analiz\u0117s metodas, naudojamas daugelyje sri\u010di\u0173, \u012fskaitant ma\u0161inin\u012f mokym\u0105si, modeli\u0173 atpa\u017einim\u0105, vaizd\u0173 analiz\u0119, informacijos paie\u0161k\u0105 ir bioinformatik\u0105. Pati klasterin\u0117 analiz\u0117 yra ne vienas konkretus algoritmas, o bendras sprend\u017eiamas u\u017edavinys. J\u012f galima atlikti \u012fvairiais algoritmais, kurie labai skiriasi savo samprata, kas yra klasteris ir kaip efektyviai juos rasti. Populiarios klasteri\u0173 s\u0105vokos apima grupes, kuri\u0173 atstumai tarp klasterio nari\u0173 yra ma\u017ei, tankias duomen\u0173 erdv\u0117s sritis, intervalus arba tam tikrus statistinius pasiskirstymus. Tod\u0117l klasterizavim\u0105 galima suformuluoti kaip daugiaobjekt\u0119 optimizavimo problem\u0105. Tinkamas klasterizavimo algoritmas ir parametr\u0173 nustatymai (\u012fskaitant tokias vertes kaip naudojama atstumo funkcija, tankio riba arba numatom\u0173 klasteri\u0173 skai\u010dius) priklauso nuo konkretaus duomen\u0173 rinkinio ir numatyto rezultat\u0173 naudojimo. Klasteri\u0173 analiz\u0117, kaip tokia, n\u0117ra automatin\u0117 u\u017eduotis, o iteracinis \u017eini\u0173 atradimo arba interaktyvaus daugiaobjektinio optimizavimo procesas, apimantis bandymus ir nes\u0117kmes. Da\u017enai teks keisti pirmin\u012f duomen\u0173 apdorojim\u0105 ir modelio parametrus, kol rezultatas pasieks norimas savybes. Be termino \"klasterizavimas\", yra nema\u017eai pana\u0161ios reik\u0161m\u0117s termin\u0173, \u012fskaitant automatin\u012f klasifikavim\u0105, skaitmenin\u0119 taksonomij\u0105, botrologij\u0105 (i\u0161 graik\u0173 kalbos \u03b2\u03cc\u03c4\u03c1\u03c5\u03c2 \"vynuog\u0117\") ir tipologin\u0119 analiz\u0119. Subtil\u016bs skirtumai da\u017enai pasirei\u0161kia rezultat\u0173 panaudojimu: duomen\u0173 gavybos atveju domimasi gautomis grup\u0117mis, o automatinio klasifikavimo atveju domimasi gauta diskriminacine galia. D\u0117l to da\u017enai kyla nesusipratim\u0173 tarp tyr\u0117j\u0173, atvykusi\u0173 i\u0161 duomen\u0173 gavybos ir automatinio mokymosi sri\u010di\u0173, nes jie vartoja tuos pa\u010dius terminus ir da\u017enai tuos pa\u010dius algoritmus, ta\u010diau siekia skirting\u0173 tiksl\u0173. Klasterin\u0119 analiz\u0119 1932 m. antropologijoje prad\u0117jo Driveris ir Kroeberis, 1938 m. Zubinas ir 1939 m. Robertas Tryonas j\u0105 \u012fdieg\u0117 psichologijoje, o nuo 1943 m. j\u0105 garsiai naudojo Cattellas asmenyb\u0117s psichologijoje bruo\u017e\u0173 teorijos klasifikavimui.<\/p>","protected":false},"excerpt":{"rendered":"<p>Cluster analysis or clustering is the task of grouping a set of objects in such a way that objects in the same group (called a cluster) are more similar (in some sense or another) to each other than to those in other groups (clusters). 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