Why does the original CIDEr score calculation multiply by 10 also?

[liujqian]

https://github.com/vrama91/cider/blob/f281464c60d496b8fabb89a7a8c120f655a3a2bd/pyciderevalcap/cider/cider_scorer.py#L181

It seems that the original CIDEr score calculation is also multiplied by 10 at the end, and in practice I see the score can go above one also. I wonder why is this the case? Isn't only CIDEr-D calculation needed to do this?