Github user keypointt commented on the issue:
https://github.com/apache/spark/pull/14610
because `metrics.accuracy`, `metrics.precision`, `metrics.recall` and
`metrics.fMeasure` are exactly the same value, no point to check the difference
(always 0) with delta
https://github.com/apache/spark/blob/branch-2.0/mllib/src/main/scala/org/apache/spark/mllib/evaluation/MulticlassMetrics.scala#L137-L160
```
lazy val precision: Double = accuracy
lazy val recall: Double = accuracy
lazy val fMeasure: Double = accuracy
```
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