Apache Spark - Key Value RDD

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What would the following code do?

var inputdata = List((1,2.0),(1,12.0),(1,4.0), (1, 6.0))
var kvrdd = sc.parallelize(inputdata)
def avg(a:Double, b:Double): Double = {
    return (a+b)/2
val out = kvrdd.reduceByKey(avg)

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