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question about a and r1 and r2
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a and r1 and r2 are random numbers while according to "S. Mirjalili, S. M. Mirjalili, A. Lewis, Grey Wolf Optimizer, Advances in Engineering Software , vol. 69, pp. 46-61, 2014, DOI: http://dx.doi.org/10.1016/j.advengsoft.2013.12.007" they should be arrays. why these parameters are set to be random numbers in this code?