code: def sparse(request):
      return request.param
  
imports: from collections import deque
  import re
  import string
  import numpy
  import pytest
  import pandas.util._test_decorators
  import pandas
  import pandas._testing
  from pandas.arrays import SparseArray
label_desc: Use image node_id 2 for calling a global function with example usage: sparse(request) and returns: request