code: def make_params(self):
      
  
      if self.needs_dummy_fprop:
        if hasattr(self, "_dummy_input"):
          return
        self._dummy_input = self.make_input_placeholder()
        self.fprop(self._dummy_input)
docs: Create all Variables to be returned later by get_params.
      By default this is a no-op.
      Models that need their fprop to be called for their params to be
      created can set `needs_dummy_fprop=True` in the constructor.