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Register a new userUnsupervised Paraphrasing Consistency Training for Low Resource Named Entity Recognition
إعادة تشكيل الاتساق غير الخاضعة للإشعال
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يعد تدريب الاتساق غير الخاضع للتناسق طريقة للتعلم شبه الإشرافه يشجع الاتساق في التنبؤات النموذجية بين البيانات الأصلية والمعزز.للحصول على التعرف على الكيان المسمى (NER)، زيادة النهج الحالية تسلسل الإدخال مع استبدال الرمز المميز، بافتراض التعليقات التوضيحية على المناصب المستبدة دون تغيير.في هذه الورقة، نستكشف استخدام إعادة الصياغة كمخطط تعزز البيانات أكثر مبدئيا للتدريب على الاتساق غير المدعوم.على وجه التحديد، نقوم بتحويل المجال العشوائي الشرطي (CRF) إلى وحدة تصنيف متعدد العلامات وتشجيع الاتساق على مظهر الكيان بين التسلسلات الأصلية المعززة.تبين التجارب أن طريقتنا فعالة بشكل خاص عندما تكون التعليقات التوضيحية محدودة.
Unsupervised consistency training is a way of semi-supervised learning that encourages consistency in model predictions between the original and augmented data. For Named Entity Recognition (NER), existing approaches augment the input sequence with token replacement, assuming annotations on the replaced positions unchanged. In this paper, we explore the use of paraphrasing as a more principled data augmentation scheme for NER unsupervised consistency training. Specifically, we convert Conditional Random Field (CRF) into a multi-label classification module and encourage consistency on the entity appearance between the original and paraphrased sequences. Experiments show that our method is especially effective when annotations are limited.
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Previous works on syntactically controlled paraphrase generation heavily rely on large-scale parallel paraphrase data that is not easily available for many languages and domains. In this paper, we take this research direction to the extreme and inves
tigate whether it is possible to learn syntactically controlled paraphrase generation with nonparallel data. We propose a syntactically-informed unsupervised paraphrasing model based on conditional variational auto-encoder (VAE) which can generate texts in a specified syntactic structure. Particularly, we design a two-stage learning method to effectively train the model using non-parallel data. The conditional VAE is trained to reconstruct the input sentence according to the given input and its syntactic structure. Furthermore, to improve the syntactic controllability and semantic consistency of the pre-trained conditional VAE, we fine-tune it using syntax controlling and cycle reconstruction learning objectives, and employ Gumbel-Softmax to combine these new learning objectives. Experiment results demonstrate that the proposed model trained only on non-parallel data is capable of generating diverse paraphrases with specified syntactic structure. Additionally, we validate the effectiveness of our method for generating syntactically adversarial examples on the sentiment analysis task.
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In this paper, we present the systems submitted by our team from the Institute of ICT (HEIG-VD / HES-SO) to the Unsupervised MT and Very Low Resource Supervised MT task. We first study the improvements brought to a baseline system by techniques such
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