يک الگوريتم جديد مبتني بر آتاماتاي یادگير توزيع‌شده براي حل مسئله بهینه‌سازی خطی تصادفی روی گروه جایگشت‌ها
محورهای موضوعی : مهندسی برق و کامپیوتر
محمدرضا ملاخليلي ميبدي
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معصومه زجاجی
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1 - دانشگاه آزاد اسلامي واحد ميبد،گروه کامپیوتر
2 - دانشگاه آزاد اسلامی واحد میبد،گروه کامپیوتر
کلید واژه: آتاماتاي يادگير, آتاماتاي يادگير توزيع‌شده, گراف تصادفي, درخت پوشاي کمينه تصادفي,
چکیده مقاله :
در این مقاله ابتدا نوعی از بهینه‌سازی جایگشت معرفی شده است. در این نوع بهینه‌سازی فرض گردیده که تابع هزینه، دارای یک تابع توزیع احتمال ناشناخته است. این فرض باعث می‌شود که پیچیدگی حل مسئله یافتن جایگشت بهینه که به دلیل بزرگی ذاتی فضای جواب‌ها پیچیده است، تشدید شود. یک الگوریتم مبتنی بر آتاماتای یادگیر توزیع‌شده برای حل مسئله از طریق انجام توأمان جستجو در فضای جواب‌های جایگشت و نمونه‌گیری از مقادیر تصادفی ارائه می‌دهیم. ضمن بررسی ریاضی رفتار الگوریتم جدید پیشنهادی، نشان می‌دهیم که با انتخاب مقادیر مناسب پارامترهای الگوریتم یادگیر، این روش جدید می‌تواند جواب بهینه را با احتمالی به اندازه دلخواه نزدیک به ۱۰۰% و از طریق هدفمندکردن جستجو به کمک آتاماتای یادگیر توزیع‌شده پیدا کند. نتیجه اتخاذ این سیاست، کاهش تعداد نمونه‌گیری‌ها در روش جدید در مقایسه با روش‌های مبتنی بر نمونه‌گیری استاندارد است. در ادامه، مسئله یافتن درخت پوشای کمینه در گراف تصادفی به عنوان یک مسئله بهینه‌سازی جایگشت تصادفی بررسی گردیده و راه حل ارائه‌شده مبتنی بر آتاماتای یادگیر برای حل آن به کار گرفته شده است.
In the present research, a type of permutation optimization was introduced. It is assumed that the cost function has an unknown probability distribution function. Since the solution space is inherently large, solving the problem of finding the optimal permutation is complex and this assumption increases the complexity. In the present study, an algorithm based on distributed learning automata was presented to solve the problem by searching in the permutation answer space and sampling random values. In the present research, in addition to the mathematical analysis of the behavior of the proposed new algorithm, it was shown that by choosing the appropriate values of the parameters of the learning algorithm, this new method can find the optimal solution with a probability close to 100% and by targeting the search using the distributed learning algorithms. The result of adopting this policy is to decrease the number of samplings in the new method compared to methods based on standard sampling. In the following, the problem of finding the minimum spanning tree in the stochastic graph was evaluated as a random permutation optimization problem and the proposed solution based on learning automata was used to solve it.
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