code: def mkchi2(k):
      """Make k-best chi2 selector"""
      return SelectKBest(chi2, k=k)
  
file_path: scikit-learn/sklearn/feature_selection/tests/test_chi2.py
imports: import warnings
  import numpy
  import pytest
  import scipy.stats
  from sklearn.feature_selection import SelectKBest, chi2
  from sklearn.feature_selection._univariate_selection import _chisquare
  from sklearn.utils._testing import assert_array_almost_equal, assert_array_equal
  from sklearn.utils.fixes import COO_CONTAINERS, CSR_CONTAINERS
label_desc: Use image node_id 1 for calling a global function with example usage: mkchi2(k) and returns: SelectKBest