make note about non-determism

probppl.go

@@ -81,7 +81,7 @@ func drawFromDistributionWithReplacement(d pplKnownDistrib, r src) int64 {
 	for i, p := range d {
 		sum += p
 		if pp <= sum {
-			return int64(i)
+			return int64(i) // this introduces some non-determinism, as order of maps in go isn't guaranteed
 		}
 
 	}