code: def transform_y(self, tfms:TfmList=None, **kwargs):
          "Set `tfms` to be applied to the targets only."
          _check_kwargs(self.y, tfms, **kwargs)
          self.tfm_y=True
          if tfms is None:
              self.tfms_y = list(filter(lambda t: t.use_on_y, listify(self.tfms)))
              self.tfmargs_y = {**self.tfmargs, **kwargs}
          else:
              tfms = list(filter(lambda t: t.use_on_y, tfms))
              self.tfms_y,self.tfmargs_y = tfms,kwargs
          return self transform_y(self, tfms:TfmList=None, **kwargs):
          "Set `tfms` to be applied to the targets only."
          _check_kwargs(self.y, tfms, **kwargs)
          self.tfm_y=True
          if tfms is None:
              self.tfms_y = list(filter(lambda t: t.use_on_y, listify(self.tfms)))
              self.tfmargs_y = {**self.tfmargs, **kwargs}
          else:
              tfms = list(filter(lambda t: t.use_on_y, tfms))
              self.tfms_y,self.tfmargs_y = tfms,kwargs
          return self
docs: Set `tfms` to be applied to the targets only.