Large-Scale QA-SRL Parsing
Table 4: Results for Span Detection on the dense development dataset. Span detection results are given with the cutoff threshold τ at 0.5, and at the value which maximizes F-score. The top chart lists precision, recall and F-score with exact span match, while the bottom reports matches where the intersection over union (IOU) is ≥0.5.
['Exact Match', 'Exact Match P', 'Exact Match R', 'Exact Match F']
We report results for the span-based models at two threshold values τ: τ=0.5, and τ=τ∗ maximizing F1. The span-based model significantly improves over the BIO model in both precision and recall, although the difference is less pronounced under IOU matching.