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ORACLE GAIN greedily builds summaries by repeatedly selecting the sentence which maximizes the R12 score of the partially built summary. By linking each extracted sentence to its closest in the reference, we show that this oracle order is very similar to the true ordering of the summary.
| Extractive | Average Rank of Closest |
|---|---|
| Step | Reference Sentence |
| 1 | 4.7 |
| 2 | 6.0 |
| 3 | 6.3 |
| 4 | 6.7 |
| 5 | 7.3 |
| > 5 | 10.1 |
