go(algo): seed prng once per algo run

algo/randomSearch.go

@@ -48,18 +48,11 @@ func genValsRandomSearch(dimens uint, vals []float64, uniform *distuv.Uniform) {
 // * dimens uint: number of dimensions of the objective function
 // * f func([]float64) float64: bench func to execute (see Functions map in
 //   bench/functions.go)
-// * min/max float64: the upper/lower limit of the uniform distribution span,
-// which is relevant to the objective function.
-func singleRandomSearch(dimens uint, f func([]float64) float64, min, max float64) ([]float64, float64) {
+// * uniformDist distuv.Uniform: uniform distribution representation with
+//   the min/max bounds already set to function-specific limits.
+func singleRandomSearch(dimens uint, f func([]float64) float64, uniformDist distuv.Uniform) ([]float64, float64) {
 	vals := make([]float64, dimens)
 
-	// create a continuous uniform distribution representation within min/max bounds
-	uniformDist := distuv.Uniform{
-		Min: min,
-		Max: max,
-		Src: rand.NewSource(uint64(time.Now().UnixNano())),
-	}
-
 	genValsRandomSearch(dimens, vals, &uniformDist)
 
 	// result of the bench function.
@@ -98,6 +91,14 @@ func RandomSearchNG(maxFES, benchMinIters int, theD []int, benchFunc string) []s
 	localD = theD
 	minIters = benchMinIters
 
+	// create a continuous uniform distribution representation.
+	uniformDist := &distuv.Uniform{
+		Src: rand.NewSource(uint64(
+			time.Now().
+				UnixNano(),
+		)),
+	}
+
 	// iterate over whatever was passed to us with theD - dimens slice.
 	for _, dimens := range localD {
 		randomSearchStatDimX := &stats.Stats{
@@ -109,6 +110,10 @@ func RandomSearchNG(maxFES, benchMinIters int, theD []int, benchFunc string) []s
 		funcStats := &stats.FuncStats{BenchName: benchFunc}
 		benchFuncParams := bench.FunctionParams[benchFunc]
 
+		// set min/max bounds.
+		uniformDist.Min = benchFuncParams.Min()
+		uniformDist.Max = benchFuncParams.Max()
+
 		printRandomSearch("running bench \"" + benchFunc + "\" for " +
 			fmt.Sprint(randomSearchStatDimX.Dimens) + "D")
 
@@ -127,8 +132,7 @@ func RandomSearchNG(maxFES, benchMinIters int, theD []int, benchFunc string) []s
 				_, r := singleRandomSearch(
 					uint(dimens),
 					bench.Functions[benchFunc],
-					benchFuncParams.Min(),
-					benchFuncParams.Max(),
+					*uniformDist,
 				)
 
 				// is a switch efficient, or should an if statement be used..?