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Register a new userMemory-efficient Transformers via Top-k Attention
محولات كفاءة الذاكرة عبر اهتمام Top-K
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بعد نجاح اهتمام DOT-Product في المحولات، تم اقتراح تقريب عديدة مؤخرا لمعالجة تعقيدها التربيعي فيما يتعلق بطول الإدخال. في حين أن هذه المتغيرات هي الذاكرة وتحسب كفاءة، فمن غير الممكن استخدامها مباشرة مع نماذج اللغة المدربة مسبقا مسبقا تدربت باستخدام اهتمام الفانيليا، دون مرحلة ما قبل التدريب التصحيحية باهظة الثمن. في هذا العمل، نقترح تقريب بسيط ولكن دقيق للغاية لاهتمام الفانيليا. نقوم بمعالجة الاستعلامات في قطع، ولكل عملية استعلام، حساب أعلى الدرجات * K * فيما يتعلق بالمفاتيح. يوفر نهجنا عدة مزايا: (أ) استخدام ذاكرةه خطي في حجم الإدخال، على غرار متغيرات الانتباه الخطي، مثل أداء و RFA (B) هو استبدال انخفاض في انتباه الفانيليا الذي لا يتطلب أي تصحيحية -إجراء (ج) يمكن أن يؤدي أيضا إلى وفورات كبيرة في الذاكرة في طبقات الأعلاف إلى الأمام بعد إلقاءها في إطار القيمة المألوفة ذات القيمة الرئيسية. نحن نقيم جودة أعلى - * K * تقريب طبقات الاهتمام متعدد الأطراف على أساس الساحة الطويلة المدى، وللطبقات التغذية من T5 و unifectqa على مجموعات بيانات QA متعددة. نظرا لأن نهجنا يؤدي إلى الدقة التي تظل مما يقرب من انتباه الفانيليا في إكمال متعددة بما في ذلك التدريب من الصفر والضبط الناعم والاستدلال بالرصاص الصفر.
Following the success of dot-product attention in Transformers, numerous approximations have been recently proposed to address its quadratic complexity with respect to the input length. While these variants are memory and compute efficient, it is not possible to directly use them with popular pre-trained language models trained using vanilla attention, without an expensive corrective pre-training stage. In this work, we propose a simple yet highly accurate approximation for vanilla attention. We process the queries in chunks, and for each query, compute the top-*k* scores with respect to the keys. Our approach offers several advantages: (a) its memory usage is linear in the input size, similar to linear attention variants, such as Performer and RFA (b) it is a drop-in replacement for vanilla attention that does not require any corrective pre-training, and (c) it can also lead to significant memory savings in the feed-forward layers after casting them into the familiar query-key-value framework. We evaluate the quality of top-*k* approximation for multi-head attention layers on the Long Range Arena Benchmark, and for feed-forward layers of T5 and UnifiedQA on multiple QA datasets. We show our approach leads to accuracy that is nearly-identical to vanilla attention in multiple setups including training from scratch, fine-tuning, and zero-shot inference.
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