code: def split_none(self):
          "Don't split the data and create an empty validation set."
          val = self[[]]
          val.ignore_empty = True
          return self._split(self.path, self, valf split_none(self):
          "Don't split the data and create an empty validation set."
          val = self[[]]
          val.ignore_empty = True
          return self._split(self.path, self, val)
docs: Don't split the data and create an empty validation set.