code: def _get_memory_contents(self):
      
      if self._memory_contents is not None:
        return self._memory_contents
  
      schedule = scheduler.minimize_peak_memory(self._graph, self._scheduler_alg)
      self._memory_contents = self._graph.compute_memory_contents_under_schedule(
          schedule)
  
      return self._memory_contents
docs: Runs the scheduler to determine memory contents at every point in time.
  
      Returns:
        a list of frozenset of strings, where the ith entry describes the tensors
        in memory when executing operation i (where schedule[i] is an index into
        GetAllOperationNames()).