Enhancing Relation Extraction Using Syntactic Indicators and Sentential Contexts
TABLE IV: Contributions of Syntactic Indicators on Precision, Recall and F1-score for each Relation Category
['[BOLD] Relation', '[BOLD] Precision -', '[BOLD] Precision  [BOLD] +IS', '[BOLD] Recall -', '[BOLD] Recall  [BOLD] +IS', '[BOLD] F1-score -', '[BOLD] F1-score  [BOLD] +IS']
The proposed model incorporating syntactic indicators increases the F1-score on each category, where the precisions on all categories except Entity-Destination are increased and the recalls on most categories are improved or remained the same. Especially, the precisions on Instrument-Agency, Member-Collection, Message-Topic and Product-Producer increased by 3.13, 3.06, 2.61 and 5.95 percentage points respectively. The effects of syntactic indicators are more prominently reflected on these categories because of instances containing such types of relations often have more noisy words in the text between target entities.