code: def var(self):
          
          if self._var is None:
              self._var = symbol.var(self.name, shape=self.shape, dtype=self.dtype,
                                     lr_mult=self.lr_mult, wd_mult=self.wd_mult,
                                     init=self.init, stype=self._stype)
          return self._var
docs: Returns a symbol representing this parameter.