add some functionality to Vector, delete copy in AccumulatorSuite
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@ -29,7 +29,37 @@ class Vector(val elements: Array[Double]) extends Serializable {
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return ans
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}
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def * (scale: Double): Vector = Vector(length, i => this(i) * scale)
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/**
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* return (this + plus) dot other, but without creating any intermediate storage
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* @param plus
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* @param other
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* @return
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*/
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def plusDot(plus: Vector, other: Vector): Double = {
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if (length != other.length)
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throw new IllegalArgumentException("Vectors of different length")
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if (length != plus.length)
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throw new IllegalArgumentException("Vectors of different length")
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var ans = 0.0
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var i = 0
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while (i < length) {
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ans += (this(i) + plus(i)) * other(i)
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i += 1
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}
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return ans
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}
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def +=(other: Vector) {
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if (length != other.length)
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throw new IllegalArgumentException("Vectors of different length")
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var ans = 0.0
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var i = 0
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while (i < length) {
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elements(i) += other(i)
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i += 1
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}
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}
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def * (scale: Double): Vector = Vector(length, i => this(i) * scale)
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def / (d: Double): Vector = this * (1 / d)
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@ -64,8 +64,7 @@ class AccumulatorSuite extends FunSuite with ShouldMatchers {
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test ("value readable in tasks") {
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import Vector.VectorAccumParam._
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import Vector._
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import spark.util.Vector
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//stochastic gradient descent with weights stored in accumulator -- should be able to read value as we go
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//really easy data
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@ -121,113 +120,4 @@ class AccumulatorSuite extends FunSuite with ShouldMatchers {
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}
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}
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}
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//ugly copy and paste from examples ...
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class Vector(val elements: Array[Double]) extends Serializable {
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def length = elements.length
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def apply(index: Int) = elements(index)
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def + (other: Vector): Vector = {
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if (length != other.length)
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throw new IllegalArgumentException("Vectors of different length")
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return Vector(length, i => this(i) + other(i))
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}
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def - (other: Vector): Vector = {
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if (length != other.length)
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throw new IllegalArgumentException("Vectors of different length")
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return Vector(length, i => this(i) - other(i))
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}
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def dot(other: Vector): Double = {
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if (length != other.length)
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throw new IllegalArgumentException("Vectors of different length")
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var ans = 0.0
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var i = 0
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while (i < length) {
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ans += this(i) * other(i)
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i += 1
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}
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return ans
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}
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def plusDot(plus: Vector, other: Vector): Double = {
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if (length != other.length)
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throw new IllegalArgumentException("Vectors of different length")
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if (length != plus.length)
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throw new IllegalArgumentException("Vectors of different length")
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var ans = 0.0
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var i = 0
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while (i < length) {
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ans += (this(i) + plus(i)) * other(i)
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i += 1
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}
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return ans
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}
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def += (other: Vector) {
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if (length != other.length)
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throw new IllegalArgumentException("Vectors of different length")
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var ans = 0.0
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var i = 0
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while (i < length) {
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elements(i) += other(i)
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i += 1
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}
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}
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def * (scale: Double): Vector = Vector(length, i => this(i) * scale)
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def / (d: Double): Vector = this * (1 / d)
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def unary_- = this * -1
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def sum = elements.reduceLeft(_ + _)
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def squaredDist(other: Vector): Double = {
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var ans = 0.0
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var i = 0
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while (i < length) {
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ans += (this(i) - other(i)) * (this(i) - other(i))
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i += 1
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}
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return ans
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}
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def dist(other: Vector): Double = math.sqrt(squaredDist(other))
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override def toString = elements.mkString("(", ", ", ")")
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}
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object Vector {
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def apply(elements: Array[Double]) = new Vector(elements)
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def apply(elements: Double*) = new Vector(elements.toArray)
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def apply(length: Int, initializer: Int => Double): Vector = {
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val elements = new Array[Double](length)
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for (i <- 0 until length)
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elements(i) = initializer(i)
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return new Vector(elements)
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}
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def zeros(length: Int) = new Vector(new Array[Double](length))
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def ones(length: Int) = Vector(length, _ => 1)
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class Multiplier(num: Double) {
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def * (vec: Vector) = vec * num
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}
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implicit def doubleToMultiplier(num: Double) = new Multiplier(num)
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implicit object VectorAccumParam extends spark.AccumulatorParam[Vector] {
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def addInPlace(t1: Vector, t2: Vector) = t1 + t2
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def zero(initialValue: Vector) = Vector.zeros(initialValue.length)
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}
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}
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}
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