Implementation of Rouge-SU

[Praful932]

Thanks for this repo & the paper.

I do not see implementation for Rouge-S & Rouge-SU in the repo from the paper, Implementation of Rouge-S is straightforward, wanted to understand the implementation of Rouge-SU, I did not get this part in the Rouge-SU text

To achieve this, we extend ROUGE-S with the addition of unigram as counting unit.

Why & how do we include the unigram into the ROUGE-S formula

Thanks