code: def _post_run_hook(self, runtime):
          
          self._fixed_image = self.inputs.after
          self._moving_image = self.inputs.before
          self._contour = self.inputs.wm_seg if isdefined(self.inputs.wm_seg) else None
          NIWORKFLOWS_LOG.info(
              'Report - setting before (%s) and after (%s) images',
              self._fixed_image, self._moving_image)
  
          return super(SimpleBeforeAfterRPT, self)._post_run_hook(runtime)
docs: there is not inner interface to run