Rosetta - What score does RosettaDock use for I_sc?
Unless you (a) ran some absolutely ancient version of Rosetta or (b) explicitly specified a different score function, your protocol should have used the current default ref2015. This will be the default until a few years when the next major update is released.
You can verify this by checking your log file, which should have a line like
core.scoring.ScoreFunctionFactory:  SCOREFUNCTION: ref2015