zhengruifeng opened a new pull request #27014: [SPARK-29967][ML][FOLLOWUP] KMeans Cleanup URL: https://github.com/apache/spark/pull/27014 ### What changes were proposed in this pull request? 1, remove unused imports and variables 2, remove `countAccum: LongAccumulator`, since `costAccum: DoubleAccumulator` also records the count 3, mark `clusterCentersWithNorm` in KMeansModel trasient and lazy, since it is only used in transformation and can be directly generated from the centers. ### Why are the changes needed? 1,remove unused codes 2,avoid repeated computation 3,reduce broadcasted size ### Does this PR introduce any user-facing change? No ### How was this patch tested? existing testsuites
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