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Register a new userDisentangling Semantics and Syntax in Sentence Embeddings with Pre-trained Language Models
Deventangling Semantics و Paintax في تضمين الجملة مع نماذج اللغة المدربة مسبقا مسبقا
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حققت نماذج اللغة المدربة مسبقا نجاحا كبيرا على مجموعة واسعة من مهام NLP. ومع ذلك، فإن التمثيلات السياقية من النماذج المدربة مسبقا تحتوي على معلومات دلالية ومتنامية متشابكة، وبالتالي لا يمكن استخدامها مباشرة لاستخلاص مدينات جملة دلالية مفيدة لبعض المهام. تقدم أزواج إعادة صياغة طريقة فعالة لتعلم التمييز بين الدلالات وبناء الجملة، حيث أنهم يشاركون بشكل طبيعي دلالات وغالبا ما يختلف في بناء جملة. في هذا العمل، نقدم Parabart، وهي جملة دلالية تضمين نموذج يتعلم تكديح دلالات ودليل بناء الجملة في مذكرات الجملة التي تم الحصول عليها بواسطة نماذج اللغة المدربة مسبقا. يتم تدريب PARABART على إجراء إعادة صياغة موجهة إلى بناء الجملة، استنادا إلى جملة مصدر تشترك في الدلالات مع إعادة صياغة الهدف، وشجرة تحليل تحدد بناء الجملة المستهدف. وبهذه الطريقة، يتعلم بارابارت تعليم التمثيل الدلالي والمنظمات النحوية من مدخلاتها مع تشفير منفصلة. تبين التجارب باللغة الإنجليزية أن بارابارت تتفوق على الأحكام التي تضم نماذج تضمينها على مهام التشابه الدلالي غير المعدل. بالإضافة إلى ذلك، نظير على أن نهجنا يمكن أن يؤدي إلى إزالة المعلومات النحوية بشكل فعال من تضمين الجملة الدلالية، مما يؤدي إلى متانة أفضل ضد الاختلاف النحوي على المهام الدلالية المصب.
Pre-trained language models have achieved huge success on a wide range of NLP tasks. However, contextual representations from pre-trained models contain entangled semantic and syntactic information, and therefore cannot be directly used to derive useful semantic sentence embeddings for some tasks. Paraphrase pairs offer an effective way of learning the distinction between semantics and syntax, as they naturally share semantics and often vary in syntax. In this work, we present ParaBART, a semantic sentence embedding model that learns to disentangle semantics and syntax in sentence embeddings obtained by pre-trained language models. ParaBART is trained to perform syntax-guided paraphrasing, based on a source sentence that shares semantics with the target paraphrase, and a parse tree that specifies the target syntax. In this way, ParaBART learns disentangled semantic and syntactic representations from their respective inputs with separate encoders. Experiments in English show that ParaBART outperforms state-of-the-art sentence embedding models on unsupervised semantic similarity tasks. Additionally, we show that our approach can effectively remove syntactic information from semantic sentence embeddings, leading to better robustness against syntactic variation on downstream semantic tasks.
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