In the test set of Tencent data, the average lengths of salient spans with and without sampling are 11.6 and 2.6 respectively, and the two numbers in Yahoo data are 14.7 and 2.3 respectively.
deepCom can leverage discourse-level informa-  Table 6: Human score distributions tion rather than a few single words or bi-grams in comment generation, which demonstrates the advantage of our learning method.