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تمرکز مدلهاي خوشه بندي بر روي تعيي نمودن گروههايي از رکوردهاي مشابه و رکوردها برچسب دار بر اساس گروهي است که به آنها تعلق دارند. اين کامل هست بدون در نظر گرفتن مزيت دانش اوليه در مورد گروهها و خصوصيات آنها.در حقيقت شما ممکن نيست بداند حتي چند گروه را بايد جستجو کنيد. در حقيقت اين وجه تمايز مدلهاي حوشه بندي از ساير تکنيکهاي آموزش ماشين است، هيچ خروجي از پيش تعيين شده يا موضوع نهايي در اين مدل براي پيش بيني وچود ندارد..اين مدلها اغلب ارجاع داده شده اند به مدلهاي آموزشي بدون نظارت. از آنجا که اين مدلها هيچ استاندارد خارجي براي ارزيابي کارآيي مدلهاي دسته بندي ندارند، هيچ پاسخ درست يا غلطي براي اين مدلها وجود ندارد.ارزش آنها با توانايي آنها در بوجود آوردن گروههاي جالب توچه داده و تهيه يک توصيف سودمند براي آنهاست. متدهاي حوشه بندي بر پايه اندازه گيري فاصله بين رکوردها و بين خوشه هاست. رکوردها به کلاسترها تخصيص مي يابند در چهت حداقل کردن فاصله رکوردهاي متعلق به خوشه هاي مشابه.

دو متد خوشه بندي به شرح زير مي باشند:

-       در روش K-means مجموعه داده ها به گروههاي متمايز دسته بندي مي شوند. اين روش يک تعداد ثابت از حوشه ها را تعريف مي کند،  مکررا رکوردها را به خوشه ها تخصيص مي دهد و تنظيمات(تعديل کردن) مراکز کلاستر تا زماني که ديگر پالايش بيشتري امکانپذير نباشد گسترش مي يابد. به جای پيش بينی يک خروجی K-means از يک پروسه که بعنوان آموزش بدون نظارت خواند مي شود به الگوهاي غير پوششی که مجموعه اي از فيلدهای ورودی مي باشد استفاده مي کند. 

-            مدل kohonen نوعي شبكه عصبي را كه ميتواند براي خوشه بندي مجموعه داده ها به گروههاي مجزا بكار مي رود. شبکه کاملا  آموزش داده شد، رکوردهايي که مشابه هم هستند بايد بر روي نقشه خروجي کنار هم قرار گيرند تا زمانی  که رکوردهايي که با هم متفاوت هستند دور از يکديگر قرار گيرند. شما ميتوانيد نگاه کنيد به تعداد  مشاهدات انتقال بوسيله هر واحد که در مدلهاي کوچک(تکه اي) که منجر به شناسايي واحدهاي قوي مي شود. اين مسئله ممکن است يک ديد از تعداد خوشه ها بدهد.

مدلهاي خوشه بندي اغلب براي ايجاد خوشه ها يا دسته ها که بعنوان ورودی بعدی استفده شده بکار می روند. یک مثال عمومی از این داد و ستد قسمتها بوسيله مبادله گرها براي بخش بندی همه بخشهایشان به زير گروههاي همگن استفاده مي شود.

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