エラー

 def transform(document: Iterable[_]): Vector = { val keywordMap = scala.collection.mutable.Map(1 -> "name") val termFrequencies = mutable.HashMap.empty[Int, Double] val setTF = if (binary) (i: Int) => 1.0 else (i: Int) => termFrequencies.getOrElse(i, 0.0) + 1.0 val hashFunc: Any => Int = getHashFunction document.foreach { term => val i = nonNegativeMod(hashFunc(term), numFeatures) keywordMap += (i -> term.toString) termFrequencies.put(i, setTF(i)) } println(keywordMap.size) Vectors.sparse(numFeatures, termFrequencies.toSeq) }

def tran(document: Iterable[_]): mutable.Map[Int,String] = {
    val termFrequencies = mutable.HashMap.empty[Int, String]
    val hashFunc: Any => Int = getHashFunction
    document.foreach { term =>
      val i = nonNegativeMod(hashFunc(term), numFeatures)
      termFrequencies.put(i, term.toString)
    }
    termFrequencies
  }

 def getdict[D <: Iterable[_]](dataset: RDD[D]): mutable.Map[Int,String] = {
 var keyMap = scala.collection.mutable.Map(1 -> "name")
 val a: RDD[mutable.Map[Int,String]]=dataset.map(this.tran)
 a.foreach{line=>
 keyMap=keyMap.++(line)
 }
 keyMap
  }

def getdict[D <: Iterable[_]](dataset: RDD[D]): mutable.Map[Int,String] = {
    val keyMap = mutable.HashMap.empty[Int, String]
    val a: RDD[mutable.Map[Int,String]]=dataset.map(this.tran)
     a.foreach{line=>line.foreach{x=>
       keyMap.put(x._1,x._2)
     }
       println(keyMap.size)
     }
    println(keyMap.size)
    keyMap
  }