diff --git a/angelml/src/main/scala/org/apache/spark/angel/examples/graph/LouvainExample.scala b/angelml/src/main/scala/org/apache/spark/angel/examples/graph/LouvainExample.scala
index b4dadb5..d037ad5 100644
--- a/angelml/src/main/scala/org/apache/spark/angel/examples/graph/LouvainExample.scala
+++ b/angelml/src/main/scala/org/apache/spark/angel/examples/graph/LouvainExample.scala
@@ -42,6 +42,9 @@ object LouvainExample {
     val eps = params.getOrElse("eps", "0.0").toDouble
     val bufferSize = params.getOrElse("bufferSize", "1000000").toInt
     val isWeighted = params.getOrElse("isWeighted", "false").toBoolean
+    val srcIndex = params.getOrElse("srcIndex", "0").toInt
+    val dstIndex = params.getOrElse("dstIndex", "1").toInt
+    val weightIndex = params.getOrElse("weightIndex", "2").toInt
 
     val psPartitionNum = params.getOrElse("psPartitionNum",
       sc.getConf.get("spark.ps.instances", "10")).toInt
@@ -49,6 +52,12 @@ object LouvainExample {
     val cpDir = params.get("cpDir").filter(_.nonEmpty).orElse(GraphIO.defaultCheckpointDir)
       .getOrElse(throw new Exception("checkpoint dir not provided"))
     sc.setCheckpointDir(cpDir)
+    
+    val sep = params.getOrElse("sep",  "space") match {
+      case "space" => " "
+      case "comma" => ","
+      case "tab" => "\t"
+    }
 
     val louvain = new Louvain()
       .setPartitionNum(partitionNum)
@@ -61,10 +70,11 @@ object LouvainExample {
       .setBufferSize(bufferSize)
       .setIsWeighted(isWeighted)
       .setPSPartitionNum(psPartitionNum)
-      .setSrcNodeIdCol("src")
-      .setDstNodeIdCol("dst")
+   
 
-    val df = GraphIO.load(input, isWeighted = isWeighted)
+    val df = GraphIO.load(input, isWeighted = isWeighted,
+      srcIndex = srcIndex, dstIndex = dstIndex,
+      weightIndex = weightIndex, sep = sep)
     val mapping = louvain.transform(df)
     GraphIO.save(mapping, output)
     stop()