'In PSO, do you change r1,r2 for each particle during the iteration, or keep them the same during the iteration?

I have seen both versions. I was just wondering if there is a great difference between them. I always thought that r1,r2 are each a random uniform in (0,1) that gets generated for a specific particle's update. It makes sense to me to have more randomness.

particles particle-swarm

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'In PSO, do you change r1,r2 for each particle during the iteration, or keep them the same during the iteration?

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