code: def _find_duplicates(els):
      seen = set()
      dups = []
      for x in els:
          if x in seen:
              dups.append(x)
          else:
              seen.add(x)
      return dups
  
imports: from __future__ import unicode_literals
  import abc
  import hashlib
  import json
  import re
  from tensorflow_datasets.core.utils.lazy_imports_utils import tensorflow
label_desc: Use image node_id 7 for calling a global function with example usage: _find_duplicates(els) and returns: dups