code: def parse_index_file(filename):
      index = []
      for line in open(filename):
          index.append(int(line.strip()))
      return index
  
imports: import pickle
  import sys
  import networkx
  import numpy
  import scipy.sparse
label_desc: Use image node_id 1 for calling a global function with example usage: parse_index_file(filename) and returns: index