Dilara TORUNOGLU SELAMET, Gülşen CEBİROĞLU ERYİĞİT

19885

Veri Artırımı için Yarı-Denetimli Bağlamsal Anlam Belirsizliği Giderme

Yapay zekâ alanında son dönemlerde öne çıkan derin öğrenme mimarilerinin, doğal dil işleme konusunun önemli problemlerinden biri olan Anlam Belirsizliği Giderme (ABG) çalışmalarında kayda değer gelişmelere yol açtığı gözlemlenmektedir. Denetimli yöntemler rakiplerine göre daha yüksek performans sergilemektedirler. Bunun en büyük nedeni kullanılan eğitim verilerinin büyüklükleridir. ABG problemi için İngilizce dili üzerinde elle-etiketlenmiş çok miktarda veri çevrim içi olarak erişilebilir durumdadır. Ancak düşük-kaynaklı diller (DKD’ler) probleme uygun veri eksikliği yaşamaktadırlar. Yeterli derecede probleme uygun veri toplamak ve etiketlemek vakit alıcı ve yüksek maliyet gerektiren bir iştir. Bu probleme değinmek ve aşmak üzere, bu çalışmada yarı-denetimli bağlamsal anlam belirsizliği giderme yaklaşımının veri artırımı için (daha sonra denetimli öğrenmede eğitim verisi olarak kullanılmak üzere) kullanılabileceğinin gösterilmesi amaçlanmıştır. Bu bağlamda özellikle DKD’lerde ABG problemi için test verisi bulmanın zor olması nedeniyle yaklaşımın doğruluğunu ve ilerleyen dönemlerde DKD’lerde kullanılabilirliğini ispatlamak amacıyla çevrimiçi bulunan elle-etiketlenmiş İngilizce ABG verisi kullanılmıştır. Oluşturulan yarı-denetimli yöntemde öbek kümesi (seed set) ve bağlam vektörleri (context embeddings) kullanılmaktadır. Yapılan çalışma 9 farklı bağlamsal dil modelinde (ELMo, BERT, RoBERTa vb.) test edilmiş ve her bir dil modelinin ABG problemi üzerindeki etkileri raporlanmıştır. İlk temel yaklaşıma göre sonuçlar üzerinde %28 doğruluk oranında performans artışı sağlanmıştır. (ELMo ile ilk temel yaklaşım ile %50,39 ve ELMo Anlam Öbek Esaslı Ortalama Benzerlik Modeli ile %78,06). Alınan ilk sonuçlara neticesinde, önerilen yaklaşımın özellikle DKD’ler yönelik ABG veri kümesi oluşturmak için gelecek vaat eden ettiği gösterilmiştir. Bu makale [18]’deki çalışmamızın genişletilmiş bir versiyonudur.
Anahtar Kelimeler:

veri artırımı, anlam belirsizliği giderme, derin öğrenme, bağlam vektörü

Semi-Supervised Contextual Word Sense Disambiguation for Data Augmentation

Recently, neural architectures play a significant role in the task of Word Sense Disambiguation (WSD). Supervised methods seem to be ahead of its rivals and their performance mostly depends on the size of training data. A numerous number of human-annotated data available for WSD task have been constructed for English. However, low-resource languages (LRLs) still face difficulty in finding suitable data resources. Gathering and annotating a sufficient amount of training data is a time consuming and labor-expensive work. To address and overcome this problem, in this paper we investigate the possibility of using a semi-supervised context based WSD approach for data augmentation (in order to be later used for supervised learning). Since, it is even difficult to find WSD evaluation datasets for LRLs, in this study, we use English datasets to build a proof-of concept and to evaluate their applicability onto LRLs. Our semi-supervised approach uses a seed set and context embeddings. We test with 9 different context based language models (including ELMo, BERT, RoBERTa etc.) and investigate their impacts on WSD. We increased our baseline results up to 28 percentage point improvements (baseline with ELMo 50.39% and ELMo Sense Seed Based Average Similarity Model 78.06%) in terms of accuracy. Our initial findings reveal that the proposed approach is very promising for the augmentation of WSD datasets of LRLs. This study is an extention version of the work from [18].
Keywords:

data augmentation, word sense disambiguation, deep learning, contextual embeddings,

PDF

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Türkiye Bilişim Vakfı Bilgisayar Bilimleri ve Mühendisliği Dergisi-Cover
  • ISSN: 1305-8991
  • Başlangıç: 2005
  • Yayıncı: Türkiye Bilişim Vakfı
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