zhengruifeng edited a comment on issue #27473: [SPARK-30699][ML][PYSPARK] GMM blockify input vectors URL: https://github.com/apache/spark/pull/27473#issuecomment-582765435 data: `a9a`: numFeatures=123, numInstances=32,561 testCode: ```scala import org.apache.spark.ml.clustering._ import org.apache.spark.storage.StorageLevel import org.apache.spark.ml.linalg._ val df = spark.read.format("libsvm").load("/data1/Datasets/a9a/a9a") df.persist(StorageLevel.MEMORY_AND_DISK) df.count new GaussianMixture().fit(df) val results = Seq(2, 8, 32).map { k => val start = System.currentTimeMillis; val model = new GaussianMixture().setK(k).setSeed(0).setTol(0).setMaxIter(20).fit(df); val dur = System.currentTimeMillis - start; (model, dur) } results.map(_._2) results.map(_._1.summary.numIter) results.map(_._1.summary.logLikelihood) results.map(t => t._2.toDouble / t._1.summary.numIter) ``` result: |Impl| This PR(k=2) | This PR(k=8) | This PR(k=32) | Master(k=2) | Master(k=8) | Master(k=32) | |------|----------|------------|----------|------------|----------|----------| |numIter|3|3|5|3|8|4| |logLikelihood|2814835.470027733|2817523.6371536762|2820228.372200876|2814835.4700277536|2817523.6371535994|2820228.3722007386| |dur per iteration| 950.0 | 2744.3333333333335 | 9780.6 | 1192.6666666666667 | 3446.375| 15724.75 | With NativeBlas NativeBlas OPENBLAS_NUM_THREADS=1: |Impl| This PR(k=2) | This PR(k=8) | This PR(k=32) | Master(k=2) | Master(k=8) | Master(k=32) | |------|----------|------------|----------|------------|----------|----------| |numIter|3|3|20|3|20|8| |logLikelihood|2814835.4700277243 | 2817523.6371536693 | 2820228.372200879|2814835.4700277452|2817523.6371535957|2820228.372200736| |dur per iteration| 780.0| 2356.3333333333335 | 8192.95 | 1183.0 | 3022.1 | 13073.75 |
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