Fix mixed results of rouge_score with accumulate='best'
#10147
| Job | Run time |
|---|---|
| 2m 8s | |
| 3m 19s | |
| 2m 9s | |
| 3m 18s | |
| 5m 11s | |
| 3m 45s | |
| 3m 0s | |
| 3m 22s | |
| 4m 14s | |
| 3m 35s | |
| 3m 34s | |
| 4m 55s | |
| 3m 2s | |
| 45m 32s |