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Register a new userA Model of Cross-Lingual Knowledge-Grounded Response Generation for Open-Domain Dialogue Systems
نموذج من جيل الاستجابة المعرفة عبر اللغات لنظم الحوار مفتوح المجال
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البحث في أنظمة الحوار مفتوح المجال التي تسمح بمواضيع مجانية صعبة في مجال معالجة اللغات الطبيعية (NLP). تم تحسين أداء نظام الحوار مؤخرا من خلال الطريقة التي تستخدم المعرفة المتعلقة بالحوار؛ ومع ذلك، فإن أنظمة الحوار غير الإنجليزية تعاني من إعادة إنتاج أداء أنظمة الحوار باللغة الإنجليزية لأن تأمين المعرفة بنفس اللغة مع نظام الحوار صعب نسبيا. من خلال تجارب مع نظام حوار كوري، تثبت هذه الورقة أن أداء نظام الحوار غير الإنجليزي يمكن تحسينه عن طريق استخدام المعرفة الإنجليزية، وتسليط الضوء على النظام يستخدم المعرفة عبر اللغات. بالنسبة للتجارب، نحن 1) شيدنا نسخة كورية من معالج DataSet Wikipedia، 2) بنيت Korean-English T5 (KE-T5)، وهي نموذج لغة مدرب مسبقا مع كوريا والإنجليزية، و 3) طورت المعرفة وضع نموذج الحوار الكوري على أساس KE-T5. لاحظنا تحسين الأداء في نموذج الحوار الكوري مفتوح المجال حتى تم تقديم المعرفة الإنجليزية فقط. أظهرت النتائج التجريبية أن المعرفة المتأصلة في نماذج اللغة عبر اللغات يمكن أن تكون مفيدة لتوليد الاستجابات في أنظمة الحوار المفتوحة.
Research on open-domain dialogue systems that allow free topics is challenging in the field of natural language processing (NLP). The performance of the dialogue system has been improved recently by the method utilizing dialogue-related knowledge; however, non-English dialogue systems suffer from reproducing the performance of English dialogue systems because securing knowledge in the same language with the dialogue system is relatively difficult. Through experiments with a Korean dialogue system, this paper proves that the performance of a non-English dialogue system can be improved by utilizing English knowledge, highlighting the system uses cross-lingual knowledge. For the experiments, we 1) constructed a Korean version of the Wizard of Wikipedia dataset, 2) built Korean-English T5 (KE-T5), a language model pre-trained with Korean and English corpus, and 3) developed a knowledge-grounded Korean dialogue model based on KE-T5. We observed the performance improvement in the open-domain Korean dialogue model even only English knowledge was given. The experimental results showed that the knowledge inherent in cross-lingual language models can be helpful for generating responses in open dialogue systems.
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Despite achieving remarkable performance, previous knowledge-enhanced works usually only use a single-source homogeneous knowledge base of limited knowledge coverage. Thus, they often degenerate into traditional methods because not all dialogues can
be linked with knowledge entries. This paper proposes a novel dialogue generation model, MSKE-Dialog, to solve this issue with three unique advantages: (1) Rather than only one, MSKE-Dialog can simultaneously leverage multiple heterogeneous knowledge sources (it includes but is not limited to commonsense knowledge facts, text knowledge, infobox knowledge) to improve the knowledge coverage; (2) To avoid the topic conflict among the context and different knowledge sources, we propose a Multi-Reference Selection to better select context/knowledge; (3) We propose a Multi-Reference Generation to generate informative responses by referring to multiple generation references at the same time. Extensive evaluations on a Chinese dataset show the superior performance of this work against various state-of-the-art approaches. To our best knowledge, this work is the first to use the multi-source heterogeneous knowledge in the open-domain knowledge-enhanced dialogue generation.
Incorporating external knowledge sources effectively in conversations is a longstanding problem in open-domain dialogue research. The existing literature on open-domain knowledge selection is limited and makes certain brittle assumptions on knowledge
sources to simplify the overall task, such as the existence of a single relevant knowledge sentence per context. In this work, we evaluate the existing state of open-domain conversation knowledge selection, showing where the existing methodologies regarding data and evaluation are flawed. We then improve on them by proposing a new framework for collecting relevant knowledge, and create an augmented dataset based on the Wizard of Wikipedia (WOW) corpus, which we call WOW++. WOW++ averages 8 relevant knowledge sentences per dialogue context, embracing the inherent ambiguity of open-domain dialogue knowledge selection. We then benchmark various knowledge ranking algorithms on this augmented dataset with both intrinsic evaluation and extrinsic measures of response quality, showing that neural rerankers that use WOW++ can outperform rankers trained on standard datasets.
Knowledge-grounded dialogue generation has achieved promising performance with the engagement of external knowledge sources. Typical approaches towards this task usually perform relatively independent two sub-tasks, i.e., knowledge selection and know
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Transformer-based pre-trained language models boost the performance of open-domain dialogue systems. Prior works leverage Transformer-based pre-trained language models to generate texts with desired attributes in two general approaches: (1) gradient-
based methods: updating all latent representations of pre-trained models with gradients from attribute models; (2) weighted-decoding methods: re-ranking beam candidates from pre-trained models with attribute functions. However, gradient-based methods lead to high computation cost and can easily get overfitted on small training sets, while weighted-decoding methods are inherently constrained by the low-variance high-bias pre-trained model. In this work, we propose a novel approach to control the generation of Transformer-based pre-trained language models: the SideControl framework, which leverages a novel control attributes loss to incorporate useful control signals, and is shown to perform well with very limited training samples. We evaluate our proposed method on two benchmark open-domain dialogue datasets, and results show that the SideControl framework has better controllability, higher generation quality and better sample-efficiency than existing gradient-based and weighted-decoding baselines.
Human dialogue contains evolving concepts, and speakers naturally associate multiple concepts to compose a response. However, current dialogue models with the seq2seq framework lack the ability to effectively manage concept transitions and can hardly
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