code: def list_items(self) -> int:
      return 16
  
imports: import pytest
  import torch
  from deepspeed.inference.v2.allocator import on_device
  from deepspeed.inference.v2.inference_parameter import InferenceParameter
  from deepspeed.inference.v2.model_implementations.parameter_base import ParameterBase, ParamList
  from deepspeed.inference.v2.model_implementations.layer_container_base import LayerContainer
label_desc: Use image node_id 1 for calling the InferenceModel obj's underlying member method code with example usage: obj.list_items() and returns: int