Revert "made the evaluation plot optional"

This reverts commit f19409895abdda8ab4ea6fca4e206d3d471150e6, reversing
changes made to 0c4ef45e0c7b64d6875f90ccef60515665b5eb16.
Revert "made the evaluation plot optional"

This reverts commit 0c4ef45e0c7b64d6875f90ccef60515665b5eb16.