[jira] [Assigned] (REEF-1663) Fix TestKMeansOnDirectRunViaFileSystem failure in AppVeyor

["Mariia Mykhailova (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/REEF-1663?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mariia Mykhailova reassigned REEF-1663:
---------------------------------------

    Assignee: Mariia Mykhailova

> Fix TestKMeansOnDirectRunViaFileSystem failure in AppVeyor
> ----------------------------------------------------------
>
>                 Key: REEF-1663
>                 URL: https://issues.apache.org/jira/browse/REEF-1663
>             Project: REEF
>          Issue Type: Sub-task
>          Components: REEF.NET
>            Reporter: Mariia Mykhailova
>            Assignee: Mariia Mykhailova
>            Priority: Minor
>
> {{O.A.R.Tests.Functional.ML.KMeans.TestKMeans.TestKMeansOnDirectRunViaFileSystem}} [failed on AppVeyor|https://ci.appveyor.com/project/ApacheSoftwareFoundation/reef/build/1124-master/job/j85983ju7qyytgdc/tests] with error
> {noformat}
> System.InvalidOperationException : The new loss 14658.95 is larger than previous loss 14658.95, while loss function must be monotonically decreasing across iterations
> {noformat}
> I doubt that the new loss was really significantly less than the previous one, since the displayed values are identical. But the test uses exact comparisons of floating-point numbers, which occasionally might produce unexpected results.
> We should probably replace exact comparisons with a proper comparison function, as described [here|http://stackoverflow.com/questions/3874627/floating-point-comparison-functions-for-c-sharp]. Note that this comparison is done in two files - {{TestKMeans.cs}} and {{KMeansMasterTask.cs}}.



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