Github user dbtsai commented on a diff in the pull request:

    https://github.com/apache/spark/pull/1425#discussion_r15013786
  
    --- Diff: 
mllib/src/test/scala/org/apache/spark/mllib/evaluation/BinaryClassificationMetricsSuite.scala
 ---
    @@ -20,8 +20,20 @@ package org.apache.spark.mllib.evaluation
     import org.scalatest.FunSuite
     
     import org.apache.spark.mllib.util.LocalSparkContext
    +import org.apache.spark.mllib.util.TestingUtils._
     
     class BinaryClassificationMetricsSuite extends FunSuite with 
LocalSparkContext {
    +
    +  implicit class SeqDoubleWithAlmostEquals(val x: Seq[Double]) {
    +    def almostEquals(y: Seq[Double], eps: Double = 1E-6): Boolean =
    --- End diff --
    
    Yeah, for one ulp, it might be 10e-15. Lots of time, I manually type the 
numbers or just copy the first couple dights of numbers to save the line space, 
so that's why I chose 1.0e-6. Thus, I can just type around 7 digits of numbers. 
    
    I agree with you that in this case, we may want to explicitly specify with 
larger epsilon.


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