Hi, thanks for the feedback!

I have actually encountered this problem when I was writing the code. After some research, I found that these are two kinds of implementaion. And they both guarantee that the final result will converge to the correct value. If you take a look at the PageRank pseudocode on the internet, you could find both version!

Interestingly, I have done some experiments to compare these two kinds of implementation. The result turned out that updating the PageRank right away actually helps the system to converge faster!