Return the configured target binary class level
For binary classification problems, ensemble
stacks and certain performance measures require an awareness
of which class in a two-factor outcome is the "target" class.
By default, this class will be assumed to be the first level in
an outcome factor but that setting can be overridden using
setBinaryTargetLevel(2L).
getBinaryTargetLevel()
Currently configured binary target level (as integer equal to 1 or 2)
setBinaryTargetLevel
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