Leveraging Schema Labels to Enhance Dataset Search
Table 4: Unsupervised ranking results on table retrieval.
['Used Fields', 'NDCG@5', '@10', '@15', '@20']
Unlike Zhang and Balog [Zhang:2017:ESA], we consider page title, section title and caption as a single text field, in order to reduce the number of hyperparameters (field weights). The results show that generated labels are more effective than original labels for table ranking. It is unsurprising because generated labels often include not only original labels but also additional labels that can benefit the ranking model. We also notice that including the data table field achieves better results than not scoring it, which is contrary to the results of dataset ranking. It is also expected since WikiTables are entity-focused and include a lot of text information while data tables from data.gov include more numeric values.