code: def jac(y, t):
      n = len(y)
      jac = np.zeros((n, n), order="F")
      banded5x5.banded5x5_jac(t, y, 1, 1, jac)
      return jac
  
file_path: scipy/scipy/integrate/tests/test_odeint_jac.py
imports: import numpy
  from numpy.testing import assert_equal, assert_allclose
  from scipy.integrate import odeint
  import scipy.integrate._test_odeint_banded
label_desc: Use image node_id 2 for calling a global function with example usage: jac(y, t) and returns: jac