Evaluating Semantic Parsing against a Simple Web-based Question Answering Model
Table 4: Feature ablation results. The five features that lead to largest drop in performance are displayed.
['[BOLD] Feature Template', '[BOLD] F1', 'Δ']
Note that TF-IDF is by far the most impactful feature, leading to a large drop of 12 points in performance. This shows the importance of using the redundancy of the web for our QA system.