وفّر 50٪ من خلال الاشتراك السنوي في مجرة واحصل على تصفح لا محدود لأفضل محتوى عربي على الإنترنت.
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عبارة عن تابع يُستخدم في الشبكات العصبونية الاصطناعية، ويكون مسؤولاً عن اتخاذ القرار حول تفعيل عصبون ما أو لا عن طريق حساب المجموع الموزون لإشارات الدخل والانحياز. وبكلمات أخرى يمكن تشبيه هذا التابع ببوابة تفحص قيم الدخل لتُحدد خرج العصبون بناءً عليها. يعرف خرج تابع التنشيط بالانتشار الأمامي "انتشار المعلومات". وتكمن أهميته في أنه يضيف ميزة عدم الخطية إلى الشبكات العصبونية؛ مما يسمح لها بتعلم العمليات القوية. وفي حال تم الاستغناء عنه يمكن تمثيل الشبكة بعملية خطية بسيطة ولن تكون قادرة على أداء المهام المعقدة مثل التعرف على الصور.
استوحى علماء الحاسوب فكرة تابع التنشيط من مفهوم "جهد أو كمون الفعل" في البيولوجيا العصبية. ففي حال تجاوز فرق الجهد أو الكمون الكهربائي بين دخل وخرج العصبون قيمة معينة (قيمة كمون الفعل)، تحدث سلسلة من التفاعلات الكيميائية التي تسمح بنقل إشارة تدعى "السيال العصبي" إلى العصبونات المجاورة؛ وبالتالي حدوث تواصل بين الخلايا. وبآلية مماثلة يقوم تابع التفعيل بتفعيل العصبون لإعطاء قيمة على الخرج عندما يتخطى المجموع الموزون لإشارات الدخل والانحياز قيمة حرجة معينة.
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