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Register a new userModeling Document-Level Context for Event Detection via Important Context Selection
النمذجة السياق على مستوى المستند للكشف عن الحدث من خلال اختيار السياق الهام
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تهدف مهمة اكتشاف الحدث (ED) في استخراج المعلومات إلى الاعتراف وتصنيف كلمات الأحداث في النص. تميز التقدم الأخير نماذج لغوية متقدمة للمحولات المتقدمة (على سبيل المثال، بيرت) كعنصر حاسم في النماذج الحديثة للإد. ومع ذلك، فإن الحد الطول لنصوص الإدخال هو حاجز لمثل هذه النماذج المحددة لأنها لا تستطيع تشفير سياق مستوي المستند طويل المدى الذي ثبت أنه مفيد لإد إد. لمعالجة هذه المشكلة، نقترح طريقة رواية لنموذج سياق مستوى المستندات لتحديد الجمل ذات الصلة بشكل حيوي في وثيقة التنبؤ بالحدث بالسجن الهدف. سيتم بعد ذلك زيادة الجملة المستهدفة بالجمل المختارة وتستهلكها النماذج اللغوية القائمة على المحولات لتعلم التمثيل المحسن. تحقيقا لهذه الغاية، يتم استخدام خوارزمية التعزيز لتدريب اختيار الجملة ذات الصلة من أجل إد. يتم بعد ذلك تقديم العديد من أنواع المعلومات لتشكيل وظيفة المكافآت لعملية التدريب، بما في ذلك أداء إد، وإشراك الجملة، وعلاقات الخطاب. تجاه تجاربنا الواسعة على مجموعات البيانات القياسية المتعددة تكشف عن فعالية النموذج المقترح، مما يؤدي إلى أداء جديد من الفنادق الجديدة.
The task of Event Detection (ED) in Information Extraction aims to recognize and classify trigger words of events in text. The recent progress has featured advanced transformer-based language models (e.g., BERT) as a critical component in state-of-the-art models for ED. However, the length limit for input texts is a barrier for such ED models as they cannot encode long-range document-level context that has been shown to be beneficial for ED. To address this issue, we propose a novel method to model document-level context for ED that dynamically selects relevant sentences in the document for the event prediction of the target sentence. The target sentence will be then augmented with the selected sentences and consumed entirely by transformer-based language models for improved representation learning for ED. To this end, the REINFORCE algorithm is employed to train the relevant sentence selection for ED. Several information types are then introduced to form the reward function for the training process, including ED performance, sentence similarity, and discourse relations. Our extensive experiments on multiple benchmark datasets reveal the effectiveness of the proposed model, leading to new state-of-the-art performance.
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