perturbation
The amount of the perturbation for Algorithm 4 in the paper:
H. Wang, R. Pasupathy, and B. W. Schmeiser, “Integer-Ordered Simulation Optimization using R-SPLINE: Retrospective Search with Piecewise-Linear Interpolation and Neighborhood Enumeration,” ACM Transactions on Modeling and Computer Simulation (TOMACS), vol. 23, no. 3, pp. 17–24, July 2013, doi: 10.1145/2499913.2499916.