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Register a new userGradient Imitation Reinforcement Learning for Low Resource Relation Extraction
التدرج تقليد التعزيز التعلم لاستخراج علاقة الموارد المنخفضة
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تهدف استخراج العلاقات المنخفضة الموارد (LRE) إلى استخراج حقائق العلاقة من كورسا محدودة المسمى عندما تشريح الإنسان نادرة. تعمل الأعمال الموجودة إما استخدام مخطط التدريب الذاتي لتوليد ملصقات زائفة ستتسبب في مشكلة الانجراف التدريجي، أو نظام التعلم التلوي الاستفادي الذي لا يتطلب التغيلات بشكل صريح. لتخفيف التحيز الاختيار بسبب عدم وجود حلقات ردود الفعل في نماذج التعلم الحالية، قمنا بتطوير طريقة تعليمية لتعزيز التعزيز التدرج لتشجيع بيانات الملصقات الزائفة لتقليد اتجاه نزول التدرج على البيانات المسمى و Bootstrap إمكانية التحسين من خلال التجربة والخطأ. نقترح أيضا إطارا يسمى Gradlre، الذي يتعامل مع سيناريوهات رئيسيين في استخراج علاقة الموارد المنخفضة. إلى جانب السيناريو حيث تكون البيانات غير المسبقة كافية، يتعامل Gradlre الموقف حيث لا تتوفر بيانات غير قابلة للتحقيق، من خلال استغلال طريقة تكبير سياقيا لتوليد البيانات. النتائج التجريبية على مجموعات بيانات عامة تثبت فعالية الخريجين في استخراج العلاقات المنخفضة للموارد عند مقارنة مع الأساس.
Low-resource Relation Extraction (LRE) aims to extract relation facts from limited labeled corpora when human annotation is scarce. Existing works either utilize self-training scheme to generate pseudo labels that will cause the gradual drift problem, or leverage meta-learning scheme which does not solicit feedback explicitly. To alleviate selection bias due to the lack of feedback loops in existing LRE learning paradigms, we developed a Gradient Imitation Reinforcement Learning method to encourage pseudo label data to imitate the gradient descent direction on labeled data and bootstrap its optimization capability through trial and error. We also propose a framework called GradLRE, which handles two major scenarios in low-resource relation extraction. Besides the scenario where unlabeled data is sufficient, GradLRE handles the situation where no unlabeled data is available, by exploiting a contextualized augmentation method to generate data. Experimental results on two public datasets demonstrate the effectiveness of GradLRE on low resource relation extraction when comparing with baselines.
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Neural relation extraction models have shown promising results in recent years; however, the model performance drops dramatically given only a few training samples. Recent works try leveraging the advance in few-shot learning to solve the low resourc
e problem, where they train label-agnostic models to directly compare the semantic similarities among context sentences in the embedding space. However, the label-aware information, i.e., the relation label that contains the semantic knowledge of the relation itself, is often neglected for prediction. In this work, we propose a framework considering both label-agnostic and label-aware semantic mapping information for low resource relation extraction. We show that incorporating the above two types of mapping information in both pretraining and fine-tuning can significantly improve the model performance on low-resource relation extraction tasks.
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