init code

val spark_home = "/root/spark"
val master = Source.fromFile("/root/spark-ec2/cluster-url").mkString.trim
val master_hostname = Source.fromFile("/root/spark-ec2/masters").mkString.trim
val file = "/root/lda/data/data.txt"
val conf = new SparkConf()
                  .setMaster(master)
                  .setAppName("LDA")
                  .setJars(Seq(jar_file))
                  .setSparkHome(spark_home)
spark_context = new SparkContext(conf)
data = this.spark_context.textFile(file, 1).cache()