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[SPARK-15617][ML][DOC] Clarify that fMeasure in MulticlassMetrics is "micro" f1_score
## What changes were proposed in this pull request? 1, del precision,recall in `ml.MulticlassClassificationEvaluator` 2, update user guide for `mlllib.weightedFMeasure` ## How was this patch tested? local build Author: Ruifeng Zheng <ruifengz@foxmail.com> Closes #13390 from zhengruifeng/clarify_f1.
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- docs/mllib-evaluation-metrics.md 3 additions, 13 deletionsdocs/mllib-evaluation-metrics.md
- mllib/src/main/scala/org/apache/spark/ml/evaluation/MulticlassClassificationEvaluator.scala 5 additions, 7 deletions...ark/ml/evaluation/MulticlassClassificationEvaluator.scala
- mllib/src/test/scala/org/apache/spark/ml/evaluation/MulticlassClassificationEvaluatorSuite.scala 1 addition, 1 deletion...l/evaluation/MulticlassClassificationEvaluatorSuite.scala
- python/pyspark/ml/evaluation.py 1 addition, 3 deletionspython/pyspark/ml/evaluation.py
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