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Despite recent efforts to improve different tasks in table understanding by using the power of large pre-trained language models, existing methods heavily rely on large-scale and high-quality labeled instances, while they still suffer from the data sparsity problem due to the imbalanced data distribution among different classes. In this paper, we propose the Watchog framework, which employs contrastive learning techniques to learn robust representations for tables by leveraging a large-scale unlabeled table corpus with minimal overhead. Our approach enables the learned table representations to enhance fine tuning with much fewer additional labeled instances than in prior studies for downstream column annotation tasks. Besides, we further proposed optimization techniques for semi-supervised settings. Experimental results on popular benchmarking datasets illustrate the superiority of our proposed techniques in two column annotation tasks under different settings. In particular, our Watchog framework effectively alleviates the class imbalance issue caused by a long-tailed label distribution. In the semi-supervised setting, Watchog outperforms the best-known method by up to 26% and 41% in Micro and Macro F1 scores, respectively, on the task of semantic type detection.<\/jats:p>","DOI":"10.1145\/3626766","type":"journal-article","created":{"date-parts":[[2023,12,12]],"date-time":"2023-12-12T14:01:21Z","timestamp":1702389681000},"page":"1-24","source":"Crossref","is-referenced-by-count":12,"title":["Watchog: A Light-weight Contrastive Learning based Framework for Column Annotation"],"prefix":"10.1145","volume":"1","author":[{"ORCID":"https:\/\/orcid.org\/0009-0008-2371-1186","authenticated-orcid":false,"given":"Zhengjie","family":"Miao","sequence":"first","affiliation":[{"name":"Megagon Labs, Mountain View, CA, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3172-6133","authenticated-orcid":false,"given":"Jin","family":"Wang","sequence":"additional","affiliation":[{"name":"Megagon Labs, Mountain View, CA, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"320","published-online":{"date-parts":[[2023,12,12]]},"reference":[{"key":"e_1_2_1_1_1","unstructured":"Philip Bachman Ouais Alsharif and Doina Precup. 2014. 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