Periodic clean of MEH is needed

matrix.go

@@ -246,7 +246,7 @@ func (c *ByClassifier) readStatsTokens() {
 //CleanMEH cleans periodically the spurious tokens.
 func (c *ByClassifier) CleanMEH() {
 
-	fmt.Println("Clean MEH Thread running...")
+	log.Println("Clean MEH Thread running...")
 
 	for a := range time.Tick(24 * time.Hour) {