Knowledge Guided Text Retrieval and Reading for Open Domain Question Answering
Table 3: Effect of different retrieval methods. We compare text-match retrieval and GraphReader with ‘Text-match + Wikidata’ (described in Section 5.1).
['Retriever', '[BOLD] WebQ', '[BOLD] Natural Q']
This variant can be seen as late combination between the text-match and Wikidata-based retrieval, whereas GraphRetriever provides early combination. Although ‘Text-match + Wikidata’ outperforms text-match retrieval by a large margin, our GraphRetriever significantly outperforms this method, showing the importance of jointly leveraging text-match and Wikidata for graph construction.