code: def print_3d_index_map(self, tag=None):
      if tag:
          print(f"3D index map: {tag}")
      for dp_index, _2d_map in enumerate(self._3d_file_map):
          _2d_map.print_data(f"dp = {dp_index}")
  
imports: import torch
  from .constants import BASE_OPTIMIZER_STATE, GROUP_PADDINGS, OPTIMIZER_STATE_DICT, PARTITION_COUNT
  from .reshape_utils import basic_folder_validation, get_zero_files, merge_state
  from .reshape_3d_utils import model_3d_desc, get_model_3d_descriptor
label_desc: Use image node_id 9 for calling the ZeROCheckpoint obj's underlying member method code with example usage: obj.print_3d_index_map(tag) without return types