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Register a new userProbing Word Translations in the Transformer and Trading Decoder for Encoder Layers
التحقيق ترجمات كلمة في محول ومكتشف التداول لطبقات التشفير
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نظرا لفعاليتها وأدائها، اجتذب نموذج الترجمة المحولات اهتماما واسعا، مؤخرا من حيث النهج القائمة على التحقيق. يركز العمل السابق على استخدام أو التحقيق في الميزات اللغوية المصدر في التشفير. حتى الآن، فإن الطريقة التي تتطور فيها ترجمة كلمة تتطور في طبقات المحولات لم يتم التحقيق فيها بعد. ساذجا، قد يفترض المرء أن طبقات التشفير التقاط معلومات المصدر أثناء ترجمة طبقات فك التشفير. في هذا العمل، نظير على أن هذا ليس كذلك: الترجمة تحدث بالفعل تدريجيا في طبقات التشفير وحتى في تضمين المدخلات. أكثر من المستغرب، نجد أن بعض طبقات وحدة فك التشفير المنخفضة لا تفعل ذلك بالفعل فك التشفير. نعرض كل هذا من حيث النهج التحقيق حيث نعلم تمثيلات الطبقة التي تم تحليلها إلى مستوى التصنيف المدربين والمجمد النهائي من وحدة فك الترميز المحول لقياس دقة ترجمة Word. تحفز النتائج التي توصلنا إليها وشرح تغيير تكوين محول: إذا حدث الترجمة بالفعل في طبقات التشفير، فربما يمكننا زيادة عدد طبقات التشفير، مع تقليل عدد طبقات فك ترميز أو زيادة سرعة فك التشفير، دون خسارة في جودة الترجمة؟ تبين تجاربنا أن هذا هو في الواقع الحالة: يمكننا زيادة السرعة إلى عامل 2.3 مع مكاسب صغيرة في جودة الترجمة، في حين أن تكوين التشفير العميق 18-4 يعزز جودة الترجمة عن طريق +1.42 بلو (EN-DE) بسرعة -1.4 1.4.
Due to its effectiveness and performance, the Transformer translation model has attracted wide attention, most recently in terms of probing-based approaches. Previous work focuses on using or probing source linguistic features in the encoder. To date, the way word translation evolves in Transformer layers has not yet been investigated. Naively, one might assume that encoder layers capture source information while decoder layers translate. In this work, we show that this is not quite the case: translation already happens progressively in encoder layers and even in the input embeddings. More surprisingly, we find that some of the lower decoder layers do not actually do that much decoding. We show all of this in terms of a probing approach where we project representations of the layer analyzed to the final trained and frozen classifier level of the Transformer decoder to measure word translation accuracy. Our findings motivate and explain a Transformer configuration change: if translation already happens in the encoder layers, perhaps we can increase the number of encoder layers, while decreasing the number of decoder layers, boosting decoding speed, without loss in translation quality? Our experiments show that this is indeed the case: we can increase speed by up to a factor 2.3 with small gains in translation quality, while an 18-4 deep encoder configuration boosts translation quality by +1.42 BLEU (En-De) at a speed-up of 1.4.
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