{"id":35492,"date":"2025-11-30T09:40:34","date_gmt":"2025-11-30T06:40:34","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/?p=35492"},"modified":"2025-11-30T09:40:34","modified_gmt":"2025-11-30T06:40:34","slug":"boyut-indirgeme-izometrik-haritalama-isomap","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/boyut-indirgeme-izometrik-haritalama-isomap\/","title":{"rendered":"Boyut \u0130ndirgeme: \u0130zometrik Haritalama (IsoMap)"},"content":{"rendered":"<p><body><\/p>\n<h2>Boyut \u0130ndirgeme: \u0130zometrik Haritalama (IsoMap)<\/h2>\n<p>Boyut indirgeme, modern veri analizinin temel ta\u015flar\u0131ndan biridir ve y\u00fcksek boyutlu veri k\u00fcmelerinin karma\u015f\u0131kl\u0131\u011f\u0131yla ba\u015fa \u00e7\u0131kmak i\u00e7in vazge\u00e7ilmez bir ara\u00e7t\u0131r. G\u00fcn\u00fcm\u00fcz d\u00fcnyas\u0131nda, biyoinformatikten g\u00f6r\u00fcnt\u00fc i\u015flemeye, finansal analizden do\u011fal dil i\u015flemeye kadar pek \u00e7ok alanda toplanan veriler genellikle binlerce, hatta milyonlarca \u00f6zelli\u011fe (boyuta) sahip olabilir. Bu kadar y\u00fcksek boyutluluk, &#8220;boyutluluk laneti&#8221; (curse of dimensionality) olarak bilinen bir dizi sorunu beraberinde getirir. Bu sorunlar aras\u0131nda, makine \u00f6\u011frenimi modellerinin performans\u0131n\u0131n d\u00fc\u015fmesi, hesaplama maliyetlerinin artmas\u0131, veri g\u00f6rselle\u015ftirmenin imkans\u0131z hale gelmesi ve verideki g\u00fcr\u00fclt\u00fcn\u00fcn artmas\u0131 say\u0131labilir. Boyut indirgeme teknikleri, verinin temel yap\u0131s\u0131n\u0131 ve \u00f6nemli bilgisini koruyarak bu y\u00fcksek boyutlu uzay\u0131 daha d\u00fc\u015f\u00fck boyutlu bir temsiline d\u00f6n\u00fc\u015ft\u00fcrmeyi ama\u00e7lar.<\/p>\n<p>Boyut indirgeme y\u00f6ntemleri genel olarak iki ana kategoriye ayr\u0131l\u0131r: do\u011frusal (linear) ve do\u011frusal olmayan (non-linear) y\u00f6ntemler. Temel Bile\u015fen Analizi (PCA) gibi do\u011frusal y\u00f6ntemler, verinin bir hiperd\u00fczlem \u00fczerine do\u011frusal bir projeksiyonunu bulmaya \u00e7al\u0131\u015f\u0131r. Ancak, ger\u00e7ek d\u00fcnya verilerinin \u00e7o\u011fu zaman karma\u015f\u0131k, do\u011frusal olmayan yap\u0131lar sergilemesi nedeniyle, bu t\u00fcr y\u00f6ntemler verinin i\u00e7sel geometrisini yeterince iyi yakalayamayabilir. \u0130\u015fte bu noktada, verinin alt\u0131nda yatan do\u011frusal olmayan manifold yap\u0131s\u0131n\u0131 ke\u015ffetmeyi ama\u00e7layan do\u011frusal olmayan boyut indirgeme veya manifold \u00f6\u011frenme (manifold learning) teknikleri devreye girer. IsoMap (Isometric Mapping), bu do\u011frusal olmayan tekniklerin \u00f6nc\u00fclerinden ve en bilinenlerinden biridir.<\/p>\n<h3>Manifold \u00d6\u011frenme ve IsoMap&#8217;in Temelleri<\/h3>\n<p>Manifold \u00f6\u011frenme, y\u00fcksek boyutlu uzayda g\u00f6zlemledi\u011fimiz verilerin asl\u0131nda \u00e7ok daha d\u00fc\u015f\u00fck boyutlu bir &#8220;manifold&#8221; \u00fczerinde yer ald\u0131\u011f\u0131 varsay\u0131m\u0131na dayan\u0131r. Bir manifold, yerel olarak \u00d6klid uzay\u0131na benzeyen, ancak k\u00fcresel olarak karma\u015f\u0131k bir e\u011fri veya y\u00fczey olabilen matematiksel bir yap\u0131d\u0131r. \u00d6rne\u011fin, bir ka\u011f\u0131t par\u00e7as\u0131 iki boyutlu bir \u00d6klid uzay\u0131d\u0131r. Ancak bu ka\u011f\u0131d\u0131 b\u00fck\u00fcp bir silindir haline getirdi\u011fimizde, hala iki boyutlu bir i\u00e7sel yap\u0131ya sahip olmas\u0131na ra\u011fmen, \u00fc\u00e7 boyutlu bir uzayda yer al\u0131r ve y\u00fczey \u00fczerindeki iki nokta aras\u0131ndaki en k\u0131sa mesafe art\u0131k d\u00fcz bir \u00e7izgi de\u011fildir. Manifold \u00f6\u011frenme algoritmalar\u0131, bu i\u00e7sel d\u00fc\u015f\u00fck boyutlu yap\u0131y\u0131 &#8220;a\u00e7maya&#8221; ve veriyi daha anlaml\u0131 bir \u015fekilde d\u00fc\u015f\u00fck boyutlu bir uzaya g\u00f6mmeye \u00e7al\u0131\u015f\u0131r.<\/p>\n<p>IsoMap, 2000 y\u0131l\u0131nda Joshua Tenenbaum, Vin de Silva ve John Langford taraf\u0131ndan tan\u0131t\u0131lan ve manifold \u00f6\u011frenme alan\u0131nda \u00f6nemli bir \u00e7\u0131\u011f\u0131r a\u00e7an bir algoritmad\u0131r. Ad\u0131ndan da anla\u015f\u0131laca\u011f\u0131 gibi, &#8220;\u0130zometrik Haritalama&#8221; (Isometric Mapping), verinin i\u00e7sel yap\u0131s\u0131ndaki &#8220;izometrik&#8221; \u00f6zellikleri korumay\u0131 hedefler. \u0130zometri, iki uzay aras\u0131ndaki mesafelerin korunmas\u0131 anlam\u0131na gelir. Yani, IsoMap, y\u00fcksek boyutlu uzaydaki iki veri noktas\u0131 aras\u0131ndaki &#8220;jeodezik mesafeleri&#8221; (manifold \u00fczerindeki en k\u0131sa yol) koruyarak bu noktalar\u0131 d\u00fc\u015f\u00fck boyutlu bir \u00d6klid uzay\u0131na yerle\u015ftirmeye \u00e7al\u0131\u015f\u0131r. Bu, \u00f6zellikle verinin bir &#8220;swiss roll&#8221; (\u0130svi\u00e7re rulosu) gibi karma\u015f\u0131k, e\u011frisel bir yap\u0131ya sahip oldu\u011fu durumlarda PCA gibi do\u011frusal y\u00f6ntemlerin yetersiz kald\u0131\u011f\u0131 yerlerde b\u00fcy\u00fck avantaj sa\u011flar.<\/p>\n<h3>IsoMap Algoritmas\u0131n\u0131n \u00c7al\u0131\u015fma Prensibi<\/h3>\n<p>IsoMap algoritmas\u0131, \u00fc\u00e7 temel ad\u0131mdan olu\u015fur:<\/p>\n<h4>Kom\u015fuluk Grafi\u011finin Olu\u015fturulmas\u0131<\/h4>\n<p>IsoMap&#8217;in ilk ad\u0131m\u0131, y\u00fcksek boyutlu veri noktalar\u0131 aras\u0131nda yerel ba\u011flant\u0131lar\u0131 temsil eden bir kom\u015fuluk grafi\u011fi (neighborhood graph) olu\u015fturmakt\u0131r. Bu ad\u0131m, verinin manifold \u00fczerindeki yerel yap\u0131s\u0131n\u0131 yakalamak i\u00e7in kritik \u00f6neme sahiptir. \u0130ki yayg\u0131n y\u00f6ntem kullan\u0131l\u0131r:<\/p>\n<p>1.  <strong>k-En Yak\u0131n Kom\u015fu (k-Nearest Neighbors &#8211; k-NN):<\/strong> Her veri noktas\u0131 i\u00e7in, \u00d6klid mesafesine g\u00f6re en yak\u0131n k kom\u015fusu bulunur. Bu kom\u015fular aras\u0131nda bir kenar (edge) \u00e7izilir ve kenar\u0131n a\u011f\u0131rl\u0131\u011f\u0131, iki nokta aras\u0131ndaki \u00d6klid mesafesi olarak ayarlan\u0131r. Bu y\u00f6ntem, graf\u0131n yo\u011funlu\u011funu kontrol etmek i\u00e7in &#8216;k&#8217; parametresinin dikkatli se\u00e7ilmesini gerektirir.<br \/>\n2.  <strong>\u03b5-Topu (\u03b5-Ball):<\/strong> Her veri noktas\u0131 i\u00e7in, belirli bir \u03b5 (epsilon) yar\u0131\u00e7ap\u0131 i\u00e7indeki t\u00fcm noktalar kom\u015fu olarak kabul edilir. Bu kom\u015fular aras\u0131nda kenarlar olu\u015fturulur ve a\u011f\u0131rl\u0131klar yine \u00d6klid mesafesi olur. Bu y\u00f6ntem, verinin yerel yo\u011funlu\u011funa daha duyarl\u0131d\u0131r.<\/p>\n<p>Bu ad\u0131m\u0131n sonunda, veri noktalar\u0131n\u0131 d\u00fc\u011f\u00fcm (node) ve yerel mesafeleri kenar a\u011f\u0131rl\u0131klar\u0131 olarak i\u00e7eren bir a\u011f\u0131rl\u0131kl\u0131 graf elde edilir. Bu graf\u0131n ba\u011fl\u0131 (connected) olmas\u0131, algoritman\u0131n sonraki ad\u0131mlar\u0131 i\u00e7in esast\u0131r. E\u011fer graf ba\u011fl\u0131 de\u011filse, baz\u0131 noktalar aras\u0131ndaki jeodezik mesafeler hesaplanamaz.<\/p>\n<h4>Jeodezik Mesafelerin Hesaplanmas\u0131<\/h4>\n<p>Kom\u015fuluk grafi\u011fi olu\u015fturulduktan sonra, IsoMap&#8217;in ikinci ve en \u00f6nemli ad\u0131m\u0131, graf \u00fczerindeki t\u00fcm nokta \u00e7iftleri aras\u0131ndaki jeodezik mesafeleri tahmin etmektir. Jeodezik mesafe, manifold \u00fczerinde iki nokta aras\u0131ndaki en k\u0131sa yoldur. Y\u00fcksek boyutlu uzayda do\u011frudan \u00d6klid mesafesi, verinin e\u011frisel yap\u0131s\u0131 nedeniyle yan\u0131lt\u0131c\u0131 olabilir; ancak manifold \u00fczerinde bu mesafe, ger\u00e7ek i\u00e7sel uzakl\u0131\u011f\u0131 temsil eder.<\/p>\n<p>Bu ad\u0131mda, graf \u00fczerindeki en k\u0131sa yollar\u0131 bulmak i\u00e7in standart graf algoritmalar\u0131 kullan\u0131l\u0131r. En yayg\u0131n kullan\u0131lan algoritma Dijkstra algoritmas\u0131d\u0131r. Dijkstra algoritmas\u0131, her bir d\u00fc\u011f\u00fcmden di\u011fer t\u00fcm d\u00fc\u011f\u00fcmlere olan en k\u0131sa yollar\u0131 bulur. T\u00fcm nokta \u00e7iftleri aras\u0131ndaki en k\u0131sa yollar\u0131n hesaplanmas\u0131yla, y\u00fcksek boyutlu uzaydaki t\u00fcm veri noktalar\u0131 aras\u0131ndaki jeodezik mesafeleri i\u00e7eren bir mesafe matrisi (D_G) elde edilir. Bu matris, IsoMap&#8217;in temel \u00e7\u0131kt\u0131lar\u0131ndan biridir ve verinin k\u00fcresel yap\u0131s\u0131n\u0131 yans\u0131t\u0131r.<\/p>\n<h4>\u00c7ok Boyutlu \u00d6l\u00e7ekleme (Multidimensional Scaling &#8211; MDS) Uygulamas\u0131<\/h4>\n<p>IsoMap&#8217;in son ad\u0131m\u0131, hesaplanan jeodezik mesafe matrisini kullanarak veriyi d\u00fc\u015f\u00fck boyutlu bir \u00d6klid uzay\u0131na g\u00f6mmektir. Bu i\u015flem i\u00e7in Klasik \u00c7ok Boyutlu \u00d6l\u00e7ekleme (Classical Multidimensional Scaling &#8211; CMDS) kullan\u0131l\u0131r. CMDS, bir mesafe matrisi verildi\u011finde, bu mesafeleri en iyi \u015fekilde koruyan d\u00fc\u015f\u00fck boyutlu bir nokta k\u00fcmesi bulmaya \u00e7al\u0131\u015fan bir tekniktir.<\/p>\n<p>CMDS, a\u015fa\u011f\u0131daki ad\u0131mlar\u0131 izler:<\/p>\n<p>1.  <strong>Merkezleme:<\/strong> Jeodezik mesafe matrisi D_G kullan\u0131larak bir benzerlik matrisi (kernel matrix) B olu\u015fturulur. Bu benzerlik matrisi, mesafelerin karelerinin merkezlenmi\u015f hali olarak ifade edilir.<br \/>\n2.  <strong>\u00d6zde\u011fer Ayr\u0131\u015f\u0131m\u0131:<\/strong> Benzerlik matrisi B&#8217;nin \u00f6zde\u011ferleri (eigenvalues) ve \u00f6zvekt\u00f6rleri (eigenvectors) hesaplan\u0131r.<br \/>\n3.  <strong>D\u00fc\u015f\u00fck Boyutlu G\u00f6sterim:<\/strong> En b\u00fcy\u00fck \u00f6zde\u011ferlere kar\u015f\u0131l\u0131k gelen \u00f6zvekt\u00f6rler se\u00e7ilerek, veri noktalar\u0131n\u0131n d\u00fc\u015f\u00fck boyutlu uzaydaki koordinatlar\u0131 (Y) elde edilir. Se\u00e7ilen \u00f6zde\u011fer say\u0131s\u0131, verinin g\u00f6m\u00fclece\u011fi hedef boyutu belirler.<\/p>\n<p>Bu son ad\u0131m\u0131n \u00e7\u0131kt\u0131s\u0131, orijinal y\u00fcksek boyutlu verinin, jeodezik mesafelerini m\u00fcmk\u00fcn oldu\u011funca koruyarak d\u00fc\u015f\u00fck boyutlu bir uzayda temsilidir. Bu d\u00fc\u015f\u00fck boyutlu temsil, g\u00f6rselle\u015ftirme, k\u00fcmeleme veya di\u011fer makine \u00f6\u011frenimi g\u00f6revleri i\u00e7in kullan\u0131labilir.<\/p>\n<h3>IsoMap&#8217;in Temel Varsay\u0131mlar\u0131 ve Kavramlar\u0131<\/h3>\n<p>IsoMap&#8217;in etkinli\u011fi ve s\u0131n\u0131rlamalar\u0131, alt\u0131nda yatan baz\u0131 temel varsay\u0131mlar ve kavramlarla yak\u0131ndan ili\u015fkilidir:<\/p>\n<p>*   <strong>\u0130zometri (Isometry):<\/strong> IsoMap, verinin yatt\u0131\u011f\u0131 manifoldun, d\u00fc\u015f\u00fck boyutlu bir \u00d6klid uzay\u0131na izometrik olarak g\u00f6m\u00fclebilece\u011fini varsayar. Bu, manifold \u00fczerindeki jeodezik mesafelerin, d\u00fc\u015f\u00fck boyutlu g\u00f6m\u00fcl\u00fc uzaydaki \u00d6klid mesafelerine tam olarak kar\u015f\u0131l\u0131k geldi\u011fi anlam\u0131na gelir. E\u011fer manifold ger\u00e7ekte izometrik de\u011filse (yani, farkl\u0131 b\u00f6lgelerde farkl\u0131 e\u011friliklere veya gerilmelere sahipse), IsoMap&#8217;in performans\u0131 d\u00fc\u015febilir.<br \/>\n*   <strong>Ba\u011flant\u0131l\u0131l\u0131k (Connectivity):<\/strong> Kom\u015fuluk grafi\u011finin t\u00fcm noktalar aras\u0131nda ba\u011fl\u0131 olmas\u0131 gerekir. Aksi takdirde, baz\u0131 noktalar aras\u0131ndaki jeodezik mesafeler hesaplanamaz ve algoritma ba\u015far\u0131s\u0131z olur.<br \/>\n*   <strong>Yeterli \u00d6rnekleme (Sufficient Sampling):<\/strong> Veri noktalar\u0131n\u0131n manifold \u00fczerinde yeterince yo\u011fun ve d\u00fczg\u00fcn bir \u015fekilde \u00f6rneklenmi\u015f olmas\u0131 \u00f6nemlidir. Seyrek \u00f6rnekleme, kom\u015fuluk grafi\u011finin yanl\u0131\u015f olu\u015fturulmas\u0131na veya jeodezik yollar\u0131n hatal\u0131 tahmin edilmesine yol a\u00e7abilir.<br \/>\n*   <strong>\u0130\u00e7sel Boyut (Intrinsic Dimensionality):<\/strong> IsoMap, verinin alt\u0131nda yatan d\u00fc\u015f\u00fck i\u00e7sel bir boyuta sahip oldu\u011funu varsayar. Algoritma, bu i\u00e7sel boyutu otomatik olarak belirlemez; kullan\u0131c\u0131n\u0131n hedef boyutu \u00f6nceden se\u00e7mesi gerekir.<\/p>\n<h3>IsoMap&#8217;in Avantajlar\u0131<\/h3>\n<p>IsoMap, manifold \u00f6\u011frenme teknikleri aras\u0131nda \u00f6nemli bir yere sahiptir ve bir dizi avantaj sunar:<\/p>\n<p>*   <strong>Do\u011frusal Olmayan Yap\u0131lar\u0131 Yakalama:<\/strong> PCA gibi do\u011frusal y\u00f6ntemlerin ba\u015far\u0131s\u0131z oldu\u011fu, &#8220;Swiss roll&#8221; gibi karma\u015f\u0131k, e\u011frisel veri yap\u0131lar\u0131n\u0131 etkili bir \u015fekilde i\u015fleyebilir. Manifold \u00fczerindeki ger\u00e7ek jeodezik mesafeleri koruyarak verinin do\u011fal geometrisini ortaya \u00e7\u0131kar\u0131r.<br \/>\n*   <strong>K\u00fcresel Yap\u0131y\u0131 Koruma:<\/strong> Yerel kom\u015fuluklar\u0131 dikkate alman\u0131n yan\u0131 s\u0131ra, jeodezik mesafeler arac\u0131l\u0131\u011f\u0131yla verinin k\u00fcresel yap\u0131s\u0131n\u0131 da korur. Bu, uzaktaki noktalar aras\u0131ndaki ili\u015fkilerin de do\u011fru bir \u015fekilde temsil edilmesini sa\u011flar.<br \/>\n*   <strong>G\u00f6rselle\u015ftirme \u0130\u00e7in \u0130deal:<\/strong> D\u00fc\u015f\u00fck boyutlu (\u00f6zellikle 2 veya 3 boyutlu) bir g\u00f6mme \u00fcretti\u011fi i\u00e7in, y\u00fcksek boyutlu verileri anlaml\u0131 bir \u015fekilde g\u00f6rselle\u015ftirmek i\u00e7in \u00e7ok g\u00fc\u00e7l\u00fc bir ara\u00e7t\u0131r.<br \/>\n*   <strong>Sezgisel Anla\u015f\u0131labilirlik:<\/strong> Temel prensipleri (graf olu\u015fturma, en k\u0131sa yol bulma, MDS uygulama) kavramsal olarak nispeten kolay anla\u015f\u0131l\u0131r.<br \/>\n*   <strong>Deterministik Yap\u0131:<\/strong> Rastgelelik i\u00e7ermedi\u011fi i\u00e7in, belirli bir parametre setiyle her zaman ayn\u0131 \u00e7\u0131kt\u0131y\u0131 verir (kom\u015fuluk grafi\u011fi deterministik olarak olu\u015fturulursa).<\/p>\n<h3>IsoMap&#8217;in S\u0131n\u0131rlamalar\u0131<\/h3>\n<p>Her algoritma gibi, IsoMap&#8217;in de belirli s\u0131n\u0131rlamalar\u0131 ve zorluklar\u0131 vard\u0131r:<\/p>\n<p>*   <strong>Hesaplama Maliyeti:<\/strong> \u00d6zellikle b\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in IsoMap&#8217;in hesaplama maliyeti \u00f6nemli olabilir. Jeodezik mesafeleri hesaplamak i\u00e7in kullan\u0131lan Dijkstra algoritmas\u0131, t\u00fcm nokta \u00e7iftleri i\u00e7in \u00e7al\u0131\u015ft\u0131r\u0131ld\u0131\u011f\u0131nda O(N^3) veya daha optimize edilmi\u015f versiyonlarda O(N^2 log N) karma\u015f\u0131kl\u0131\u011fa sahip olabilir (N veri noktas\u0131 say\u0131s\u0131d\u0131r). Bu, milyonlarca veri noktas\u0131 i\u00e7in pratik olmayabilir.<br \/>\n*   <strong>Kom\u015fuluk Se\u00e7imine Duyarl\u0131l\u0131k (k veya \u03b5):<\/strong> &#8216;k&#8217; (k-NN i\u00e7in) veya &#8216;\u03b5&#8217; (\u03b5-ball i\u00e7in) parametresinin se\u00e7imi IsoMap&#8217;in performans\u0131n\u0131 derinden etkiler.<br \/>\n    *   <strong>\u00c7ok k\u00fc\u00e7\u00fck &#8216;k&#8217; veya &#8216;\u03b5&#8217;:<\/strong> Graf\u0131n par\u00e7alanmas\u0131na veya yanl\u0131\u015f yerel ba\u011flant\u0131lara yol a\u00e7abilir, bu da jeodezik yollar\u0131n hatal\u0131 hesaplanmas\u0131na neden olur.<br \/>\n    *   <strong>\u00c7ok b\u00fcy\u00fck &#8216;k&#8217; veya &#8216;\u03b5&#8217;:<\/strong> &#8220;Topolojik k\u0131sa devre&#8221; (topological shortcut) sorununa yol a\u00e7abilir. Bu durumda, manifold \u00fczerindeki e\u011frilikler g\u00f6z ard\u0131 edilerek, y\u00fcksek boyutlu \u00d6klid mesafeleri jeodezik mesafelere \u00e7ok yak\u0131n hale gelir ve algoritma do\u011frusal y\u00f6ntemlere benzer sonu\u00e7lar \u00fcretir, yani manifoldun do\u011frusal olmayan yap\u0131s\u0131n\u0131 yakalayamaz.<br \/>\n*   <strong>\u0130zometri Varsay\u0131m\u0131:<\/strong> Manifoldun ger\u00e7ekten izometrik olmad\u0131\u011f\u0131 durumlarda (\u00f6rne\u011fin, farkl\u0131 b\u00f6lgelerde s\u0131k\u0131\u015fmalar veya gerilmeler varsa), IsoMap iyi performans g\u00f6steremeyebilir.<br \/>\n*   <strong>Delikli veya Karma\u015f\u0131k Topolojiler:<\/strong> Manifoldun delikler, d\u00f6ng\u00fcler veya \u00e7ok karma\u015f\u0131k topolojik yap\u0131lar i\u00e7erdi\u011fi durumlarda, IsoMap bu yap\u0131lar\u0131 do\u011fru bir \u015fekilde temsil etmekte zorlanabilir.<br \/>\n*   <strong>Ayk\u0131r\u0131 De\u011ferlere Duyarl\u0131l\u0131k:<\/strong> Ayk\u0131r\u0131 de\u011ferler, yerel kom\u015fuluk yap\u0131s\u0131n\u0131 bozarak ve dolay\u0131s\u0131yla jeodezik yollar\u0131n hesaplanmas\u0131n\u0131 etkileyerek IsoMap&#8217;in sonu\u00e7lar\u0131n\u0131 olumsuz etkileyebilir.<br \/>\n*   <strong>Bellek T\u00fcketimi:<\/strong> Mesafe matrisinin (N x N boyutunda) bellekte tutulmas\u0131, N&#8217;nin b\u00fcy\u00fck oldu\u011fu durumlarda \u00f6nemli bellek gereksinimleri do\u011furabilir.<\/p>\n<h3>Di\u011fer Manifold \u00d6\u011frenme Y\u00f6ntemleriyle Kar\u015f\u0131la\u015ft\u0131rma<\/h3>\n<p>IsoMap, do\u011frusal olmayan boyut indirgeme y\u00f6ntemlerinin ilklerinden biri olsa da, zamanla bir\u00e7ok ba\u015fka teknik geli\u015ftirilmi\u015ftir. Bu tekniklerin her birinin kendine \u00f6zg\u00fc g\u00fc\u00e7l\u00fc ve zay\u0131f y\u00f6nleri vard\u0131r:<\/p>\n<p>*   <strong>Yerel Do\u011frusal G\u00f6mme (Locally Linear Embedding &#8211; LLE):<\/strong> IsoMap&#8217;ten k\u0131sa bir s\u00fcre sonra tan\u0131t\u0131lan LLE, her veri noktas\u0131n\u0131n kom\u015fular\u0131n\u0131n do\u011frusal bir kombinasyonu olarak temsil edilebilece\u011fi varsay\u0131m\u0131na dayan\u0131r. LLE, bu yerel do\u011frusal ili\u015fkileri d\u00fc\u015f\u00fck boyutlu uzayda korumaya \u00e7al\u0131\u015f\u0131r. IsoMap k\u00fcresel mesafeleri korurken, LLE daha \u00e7ok yerel yap\u0131ya odaklan\u0131r.<br \/>\n*   <strong>Laplacian Eigenmaps:<\/strong> Bu y\u00f6ntem, verinin yerel kom\u015fuluk yap\u0131s\u0131n\u0131 bir graf Laplacian matrisi arac\u0131l\u0131\u011f\u0131yla temsil eder ve bu matrisin \u00f6zvekt\u00f6rlerini kullanarak d\u00fc\u015f\u00fck boyutlu bir g\u00f6mme elde eder. IsoMap gibi, graf tabanl\u0131d\u0131r ancak mesafeleri de\u011fil, kom\u015fuluk ili\u015fkilerini korumaya odaklan\u0131r.<br \/>\n*   <strong>t-Da\u011f\u0131l\u0131ml\u0131 Stokastik Kom\u015fu G\u00f6mme (t-SNE):<\/strong> \u00d6zellikle g\u00f6rselle\u015ftirme i\u00e7in pop\u00fcler olan t-SNE, y\u00fcksek boyutlu uzaydaki olas\u0131l\u0131k da\u011f\u0131l\u0131mlar\u0131n\u0131 d\u00fc\u015f\u00fck boyutlu uzaydaki benzer da\u011f\u0131l\u0131mlarla e\u015fle\u015ftirmeye \u00e7al\u0131\u015f\u0131r. Yerel yap\u0131lar\u0131 \u00e7ok iyi korur ve k\u00fcme yap\u0131lar\u0131n\u0131n belirginle\u015fmesini sa\u011flar, ancak k\u00fcresel mesafeleri korumakta IsoMap kadar ba\u015far\u0131l\u0131 de\u011fildir ve deterministik de\u011fildir.<br \/>\n*   <strong>Tekd\u00fcze Manifold Yakla\u015f\u0131m\u0131 ve Projeksiyonu (UMAP):<\/strong> t-SNE&#8217;ye benzer \u015fekilde, UMAP de g\u00f6rselle\u015ftirme ve k\u00fcmeleme i\u00e7in g\u00fc\u00e7l\u00fc bir ara\u00e7t\u0131r. Daha h\u0131zl\u0131d\u0131r, bellekte daha verimlidir ve hem yerel hem de k\u00fcresel yap\u0131y\u0131 t-SNE&#8217;den daha iyi korudu\u011fu iddia edilir.<\/p>\n<p>IsoMap, bu y\u00f6ntemlerin bir\u00e7o\u011funun \u00f6nc\u00fcl\u00fc olmas\u0131 ve temel bir manifold \u00f6\u011frenme prensibini uygulamas\u0131 nedeniyle hala \u00f6nemlidir. \u00d6zellikle verinin alt\u0131nda yatan manifoldun ger\u00e7ekten izometrik oldu\u011fu veya k\u00fcresel mesafelerin korunmas\u0131n\u0131n kritik oldu\u011fu durumlarda tercih edilebilir.<\/p>\n<h3>Uygulama Alanlar\u0131 ve Pratik Hususlar<\/h3>\n<p>IsoMap, \u00e7e\u015fitli bilimsel ve m\u00fchendislik alanlar\u0131nda ba\u015far\u0131yla uygulanm\u0131\u015ft\u0131r:<\/p>\n<p>*   <strong>G\u00f6r\u00fcnt\u00fc \u0130\u015fleme ve Bilgisayar G\u00f6r\u00fcs\u00fc:<\/strong> Y\u00fcz tan\u0131ma, insan poz tahmini veya hareket analizi gibi alanlarda, g\u00f6r\u00fcnt\u00fclerin y\u00fcksek boyutlu pikselleri yerine, alt\u0131nda yatan d\u00fc\u015f\u00fck boyutlu poz veya ifade manifoldunu ke\u015ffetmek i\u00e7in kullan\u0131l\u0131r.<br \/>\n*   <strong>Biyoinformatik:<\/strong> Gen ifade verileri veya protein yap\u0131lar\u0131 gibi y\u00fcksek boyutlu biyolojik verilerin analizinde, karma\u015f\u0131k ili\u015fkileri ve gizli yap\u0131lar\u0131 ortaya \u00e7\u0131karmak i\u00e7in kullan\u0131labilir.<br \/>\n*   <strong>Robotik:<\/strong> Robotlar\u0131n hareket planlamas\u0131 veya kontrol\u00fcnde, karma\u015f\u0131k konfig\u00fcrasyon uzaylar\u0131n\u0131 daha y\u00f6netilebilir d\u00fc\u015f\u00fck boyutlu manifoldlara indirgemek i\u00e7in kullan\u0131l\u0131r.<br \/>\n*   <strong>Veri G\u00f6rselle\u015ftirme:<\/strong> En yayg\u0131n kullan\u0131m alanlar\u0131ndan biridir. Y\u00fcksek boyutlu veri k\u00fcmelerinin 2D veya 3D uzayda anlaml\u0131 bir \u015fekilde g\u00f6rselle\u015ftirilmesini sa\u011flayarak veri bilimcilerinin i\u00e7g\u00f6r\u00fc kazanmas\u0131na yard\u0131mc\u0131 olur.<br \/>\n*   <strong>\u00d6zellik \u00c7\u0131kar\u0131m\u0131:<\/strong> Makine \u00f6\u011frenimi modelleri i\u00e7in g\u00fcr\u00fclt\u00fcden ar\u0131nd\u0131r\u0131lm\u0131\u015f ve daha anlaml\u0131 d\u00fc\u015f\u00fck boyutlu \u00f6zellikler olu\u015fturmak amac\u0131yla kullan\u0131labilir.<\/p>\n<p><strong>Pratik Hususlar:<\/strong><\/p>\n<p>*   <strong>Parametre Se\u00e7imi:<\/strong> &#8216;k&#8217; kom\u015fu say\u0131s\u0131 veya &#8216;\u03b5&#8217; yar\u0131\u00e7ap\u0131, IsoMap&#8217;in performans\u0131n\u0131 b\u00fcy\u00fck \u00f6l\u00e7\u00fcde etkileyen en kritik parametredir. Genellikle farkl\u0131 &#8216;k&#8217; de\u011ferleri denenerek veya \u00e7apraz do\u011frulama (cross-validation) gibi tekniklerle en uygun de\u011fer bulunmaya \u00e7al\u0131\u015f\u0131l\u0131r. Manifoldun ba\u011flant\u0131l\u0131 kalmas\u0131n\u0131 sa\u011flayacak ancak k\u0131sa devreleri \u00f6nleyecek bir &#8216;k&#8217; de\u011feri hedeflenir.<br \/>\n*   <strong>Hesaplama Optimizasyonlar\u0131:<\/strong> B\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in, t\u00fcm nokta \u00e7iftleri aras\u0131ndaki mesafeleri hesaplamak yerine, yakla\u015f\u0131k en yak\u0131n kom\u015fu (Approximate Nearest Neighbors &#8211; ANN) algoritmalar\u0131 veya veri \u00f6rneklemesi gibi teknikler kullan\u0131larak IsoMap&#8217;in hesaplama maliyeti d\u00fc\u015f\u00fcr\u00fclebilir.<br \/>\n*   <strong>Yaz\u0131l\u0131m K\u00fct\u00fcphaneleri:<\/strong> Python&#8217;daki scikit-learn k\u00fct\u00fcphanesi, IsoMap&#8217;i kolayca uygulayabilece\u011finiz <code>Isomap<\/code> s\u0131n\u0131f\u0131n\u0131 sunar. Bu k\u00fct\u00fcphane, algoritman\u0131n uygulanmas\u0131n\u0131 basitle\u015ftirir ve parametre ayarlamalar\u0131 i\u00e7in kullan\u0131c\u0131 dostu bir aray\u00fcz sa\u011flar.<\/p>\n<h3>Sonu\u00e7<\/h3>\n<p>IsoMap, do\u011frusal olmayan boyut indirgeme ve manifold \u00f6\u011frenme alan\u0131nda \u00f6nemli bir kilometre ta\u015f\u0131d\u0131r. Y\u00fcksek boyutlu verinin alt\u0131nda yatan d\u00fc\u015f\u00fck boyutlu, e\u011frisel manifold yap\u0131s\u0131n\u0131 ke\u015ffetme yetene\u011fi, onu \u00f6zellikle karma\u015f\u0131k veri setlerinin g\u00f6rselle\u015ftirilmesi ve analizinde de\u011ferli bir ara\u00e7 haline getirir. Jeodezik mesafeleri koruma prensibi sayesinde, verinin k\u00fcresel yap\u0131s\u0131n\u0131 do\u011frusal y\u00f6ntemlere g\u00f6re \u00e7ok daha do\u011fru bir \u015fekilde yans\u0131tabilir.<\/p>\n<p>Ancak, hesaplama maliyeti, kom\u015fuluk se\u00e7imine duyarl\u0131l\u0131k ve izometri varsay\u0131m\u0131 gibi s\u0131n\u0131rlamalar\u0131 g\u00f6z ard\u0131 edilmemelidir. Bu s\u0131n\u0131rlamalar, IsoMap&#8217;i her zaman en iyi se\u00e7enek yapmasa da, temel prensipleri ve sa\u011flad\u0131\u011f\u0131 i\u00e7g\u00f6r\u00fcler, manifold \u00f6\u011frenme alan\u0131ndaki di\u011fer bir\u00e7ok geli\u015fmeye zemin haz\u0131rlam\u0131\u015ft\u0131r. Veri bilimcileri ve ara\u015ft\u0131rmac\u0131lar i\u00e7in, IsoMap, veri setlerinin gizli yap\u0131lar\u0131n\u0131 anlamak ve y\u00fcksek boyutlulu\u011fun getirdi\u011fi zorluklar\u0131n \u00fcstesinden gelmek i\u00e7in g\u00fc\u00e7l\u00fc ve kavramsal olarak zarif bir ara\u00e7 olmaya devam etmektedir. Do\u011fru ba\u011flamda ve dikkatli parametre se\u00e7imiyle kullan\u0131ld\u0131\u011f\u0131nda, IsoMap, y\u00fcksek boyutlu veri analizinde paha bi\u00e7ilmez i\u00e7g\u00f6r\u00fcler sa\u011flayabilir.<\/body><\/p>\n","protected":false},"excerpt":{"rendered":"Boyut \u0130ndirgeme: \u0130zometrik Haritalama (IsoMap)\nBoyut indirgeme, modern veri analizinin temel ta\u015flar\u0131ndan biridir ve y\u00fcksek boyutlu veri k\u00fcmeler","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"csco_page_header_type":"","csco_page_load_nextpost":"","csco_page_subscribe_form":"","csco_page_contact_form":"","footnotes":""},"categories":[1],"tags":[],"class_list":{"0":"post-35492","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-genel","7":"cs-entry","8":"cs-video-wrap"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v20.5 (Yoast SEO v25.3.1) - 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