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[SPARK-14272][ML] Add Loglikelihood in GaussianMixtureSummary
## What changes were proposed in this pull request? add loglikelihood in GMM.summary ## How was this patch tested? added tests Author: Zheng RuiFeng <ruifengz@foxmail.com> Author: Ruifeng Zheng <ruifengz@foxmail.com> Closes #12064 from zhengruifeng/gmm_metric.
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- mllib/src/main/scala/org/apache/spark/ml/clustering/GaussianMixture.scala 5 additions, 2 deletions...cala/org/apache/spark/ml/clustering/GaussianMixture.scala
- mllib/src/main/scala/org/apache/spark/mllib/util/MLUtils.scala 1 addition, 1 deletion.../src/main/scala/org/apache/spark/mllib/util/MLUtils.scala
- mllib/src/test/scala/org/apache/spark/ml/clustering/GaussianMixtureSuite.scala 7 additions, 0 deletions...org/apache/spark/ml/clustering/GaussianMixtureSuite.scala
- project/MimaExcludes.scala 4 additions, 1 deletionproject/MimaExcludes.scala
- python/pyspark/ml/clustering.py 10 additions, 0 deletionspython/pyspark/ml/clustering.py
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