code: def memory_reserved(self, device_index=None):
      return 0
  
imports: import os
  import pkgutil
  import importlib
  import torch
  from .abstract_accelerator import DeepSpeedAccelerator
label_desc: Use image node_id 31 for calling the HPU_Accelerator obj's underlying member method code with example usage: obj.memory_reserved(device_index) and returns: int