code: def close_open_data_files(self):
      if self.open_hdf5 is not None:
          self.open_hdf5.close()
          return_hdf5 = self.open_hdf5
          self.open_hdf5 = None
          return return_hdf5
  
imports: import os
  import csv
  import numpy
  import tables
  import copy
  from tqdm import tqdm
  from deepneuro.augmentation.augment import Copy
  from deepneuro.utilities.conversion import read_image_files
  from deepneuro.data.data_group import DataGroup
  from deepneuro.data.data_load import parse_directories, parse_filepaths, parse_hdf5, parse_csv, parse_numpy
  from deepneuro.utilities.util import add_parameter
label_desc: Use image node_id 23 for calling the DataCollection obj's underlying member method code with example usage: obj.close_open_data_files() and returns: return_hdf5