code: def icfi(x):
      return list(itertools.chain.from_iterable(x))
  
file_path: dedupe/tests/test_api.py
imports: import itertools
  import unittest
  import warnings
  from collections import OrderedDict
  import dedupe.api
label_desc: Use image node_id 1 for calling a global function with example usage: icfi(x) and returns: list