Improved version of the Nearest Neighbor "walking skeleton"

nearest_neighbor_v2.scala

class Instance( featureValues: List[Double], classLabel: Option[String] = None) {
	def assignClassLabel( assignedClassLabel: Option[String]): Instance = {
		new Instance( featureValues, assignedClassLabel)
	}
	
	override def toString(): String = {
		"<'"+classLabel.getOrElse( "None")+"' is ["+featureValues.mkString( ", ")+"]>"
	}
}

class NearestNeighbor( library: List[Instance]) {
	def classify( query: Instance): Instance = {
		query.assignClassLabel( Some( "Unknown"))
	}
}

object NearestNeighbor {
	def create( libraryFileName: String): NearestNeighbor = {
		val library = new List[ Instance]( 10)
		new NearestNeighbor( library)
	}
}

val nearestNeighbor = NearestNeighbor.create( "library.data")
val query = new Instance( List( 0.0, 0.0, 0.0, 0.0))
val classifiedQuery = nearestNeighbor.classify( query)
println( classifiedQuery)