code: def f5(x):
      return 8 * x**3 - 2 * x**2 - 7 * x + 3
  
imports: import pytest
  import numpy
  from numpy.testing import assert_allclose, assert_equal, assert_array_less
  from scipy import stats
  import scipy.optimize._chandrupatla
  from scipy.optimize._chandrupatla import _chandrupatla_minimize
  from itertools import permutations
label_desc: Use image node_id 5 for calling a global function with example usage: f5(x) and returns: unknown