go(bench): add MaxNeighbourVariancePercent

bench/bench.go

@@ -12,6 +12,9 @@ type funcParams struct {
 	// Neighbourhood is the number of neighbouring values that are to be
 	// generated as part of e.g. Stochastic Hill Climbing algo.
 	Neighbourhood = 10
+	// MaxNeighbourVariancePercent covers an arbitrary task requirement: pick
+	// neighbours from max n percent of search space.
+	MaxNeighbourVariancePercent = 10
 	// MaxFES is the maximum number of allowed function evaluations.
 	MaxFES = 10000
 )