Github user tgaloppo commented on a diff in the pull request: https://github.com/apache/spark/pull/4459#discussion_r24397429 --- Diff: mllib/src/test/scala/org/apache/spark/mllib/clustering/GaussianMixtureSuite.scala --- @@ -80,4 +81,60 @@ class GaussianMixtureSuite extends FunSuite with MLlibTestSparkContext { assert(gmm.gaussians(0).sigma ~== Esigma(0) absTol 1E-3) assert(gmm.gaussians(1).sigma ~== Esigma(1) absTol 1E-3) } + + test("single cluster with sparse data") { + val data = sc.parallelize(Array( + Vectors.sparse(3, Array(0, 2), Array(4.0, 2.0)), + Vectors.sparse(3, Array(0, 2), Array(2.0, 4.0)), + Vectors.sparse(3, Array(1), Array(6.0)) + )) + + val Ew = 1.0 + val Emu = Vectors.dense(2.0, 2.0, 2.0) + val Esigma = Matrices.dense(3, 3, + Array(8.0 / 3.0, -4.0, 4.0 / 3.0, -4.0, 8.0, -4.0, 4.0 / 3.0, -4.0, 8.0 / 3.0) + ) + + val seeds = Array(42, 1994, 27, 11, 0) + seeds.foreach { seed => + val gmm = new GaussianMixture().setK(1).setSeed(seed).run(data) + assert(gmm.weights(0) ~== Ew absTol 1E-5) + assert(gmm.gaussians(0).mu ~== Emu absTol 1E-5) + } --- End diff -- My mistake; I am sorry.
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