يک الگوريتم جديد مبتني بر آتاماتاي يادگير توزيع‌شده توسعه‌يافته براي يادگيري پارامتري شبکه بيزي
الموضوعات :
محمدرضا ملاخلیلی میبدی
1
(دانشگاه آزاد اسلامی، واحد میبد)
محمدرضا میبدی
2
(دانشگاه صنعتی امیرکبیر)
الکلمات المفتاحية: آتاماتاي يادگير شبکه بيزي يادگيري پارامتري,
ملخص المقالة :
در اين مقاله يک آتاماتاي توزيع‌شده جديد به نام آتاماتاي يادگير توزيع‌شده توسعه‌يافته براي يادگيري توزيع توأم مجموعه‌اي از متغيرهاي تصادفي معرفي خواهد شد. اين شبکه از آتاماتاها در محيط‌هايي که پاسخ محيط به مجموعه‌اي از اقدامات انجام‌شده توسط آتاماتا، مستقل از يکديگر نبوده و نوعي وابستگي شرطي ميان اين پاسخ‌ها حاکم باشد، کاربرد دارد. نشان داده شده که اين آتاماتاي جديد قادر است تخميني از توزيع شرطي اقدام‌ها را فرا بگيرد. در ادامه چارچوبی مبتني بر آتاماتاي يادگير توزيع‌شده جديد پيشنهادي، براي حل مسأله يادگيري برخط پارامترهاي یک شبکه بیزی ارائه شده است. اين چارچوب با داده‌ها و شواهد جديد منطبق شده و عمليات به روز رساني پارامترها را انجام مي‌دهد. با بررسي‌هاي رياضي و آزمايش‌هاي عملي روي شبکه‌هاي نمونه، نشان داده‌ايم که اين مدل جديد قادر است با تخميني با دقت برابر با EM، يادگيري پارامترهاي يک شبکه بيزي را انجام دهد. علاوه بر ويژگي افتراقی‌بودن و يادگيري برخط، اين ساختار جديد با شرايطي که داده‌ها ناکامل باشند نيز سازگار است و به دليل استفاده از روابط يادگيري خطي و مبتني بر آتاماتاي يادگير، سربار محاسباتي کمي نيز دارد.
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