adjusted accumulation of predictions for eval metric to work with semantic segmentation task

2 jobs for semantic_segmentation in 3 minutes and 36 seconds (queued for 1 minute and 21 seconds)
Status Job ID Name Coverage
  Windows
passed #640599
Windows10
masterJobWindows

00:02:17

 
  Linux
failed #640600
BranchJobLinux

00:01:18

 
Name Stage Failure
failed
BranchJobLinux Linux
[ERROR] Please refer to /builds/monticore/EmbeddedMontiArc/generators/CNNArch2Gluon/target/surefire-reports for the individual test results.
[ERROR] -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException
ERROR: Job failed: exit code 1