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Update Word2Vec.scala #18359

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cb12ad4
Update Word2Vec.scala
dgai91 Jun 20, 2017
3fc03d0
Update Word2Vec.scala
dgai91 Jun 20, 2017
d204612
Update Word2Vec.scala
dgai91 Jun 20, 2017
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Update Word2Vec.scala 
the word2vec model needs an independent function to calculate the cosine similarity.we also desire a function to transform the single document to a vector.so i contribute the two function.
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@dgai91
dgai91 authored Jun 20, 2017
commit cb12ad4af2c649d88646e4f4548fb208d20e88e0
24 changes: 24 additions & 0 deletions mllib/src/main/scala/org/apache/spark/ml/feature/Word2Vec.scala
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Expand Up @@ -273,6 +273,30 @@ class Word2VecModel private[ml] (
def findSynonymsArray(word: String, num: Int): Array[(String, Double)] = {
wordVectors.findSynonyms(word, num)
}


def doc2Vector(text: String, d: Int): SDV = {
val bVectors = wordVectors.getVectors.collect()
val textArray = text.split(" ")
var sum = Vectors.zeros(d)
textArray.foreach { word =>
bVectors.value.filter(_.getAs[String]("word") == word).foreach { v =>
val sv = v.getAs[SDV]("vector")
BLAS.axpy(1.0, sv, sum)
}
}
BLAS.scal(1.0 / textArray.size, sum)
sum.toDense
}

def cosineSimilarity(v1: SDV, v2: SDV): Double = {
val bdv1 = new BDV[Double](v1.values)
val bdv2 = new BDV[Double](v2.values)
val modeV1 = sqrt(bdv1 dot bdv1)
val modeV2 = sqrt(bdv2 dot bdv2)
val v1DOTv2 = bdv1 dot bdv2
v1DOTv2 / (modeV1 * modeV2)
}

/** @group setParam */
@Since("1.4.0")
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