Github user feynmanliang commented on a diff in the pull request:
https://github.com/apache/spark/pull/7166#discussion_r34108359
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/clustering/GaussianMixture.scala ---
@@ -171,14 +185,30 @@ class GaussianMixture private (
// Create new distributions based on the partial assignments
// (often referred to as the "M" step in literature)
val sumWeights = sums.weights.sum
- var i = 0
- while (i < k) {
- val mu = sums.means(i) / sums.weights(i)
- BLAS.syr(-sums.weights(i), Vectors.fromBreeze(mu),
- Matrices.fromBreeze(sums.sigmas(i)).asInstanceOf[DenseMatrix])
- weights(i) = sums.weights(i) / sumWeights
- gaussians(i) = new MultivariateGaussian(mu, sums.sigmas(i) /
sums.weights(i))
- i = i + 1
+
+ if (distributeGaussians) {
+ val (ws, gs) = sc.parallelize(0 until k).map { i =>
--- End diff --
OK.
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