code: def shock_fun(x, y):
      eps = 1e-3
      return np.vstack(
          (
              y[1],
              -(
                  x * y[1]
                  + eps * np.pi**2 * np.cos(np.pi * x)
                  + np.pi * x * np.sin(np.pi * x)
              )
              / eps,
          )
      )
  
imports: import sys
  import numpy
  from numpy.testing import assert_, assert_array_equal, assert_allclose, assert_equal
  from pytest import raises
  from scipy.sparse import coo_matrix
  from scipy.special import erf
  from scipy.integrate._bvp import modify_mesh, estimate_fun_jac, estimate_bc_jac, compute_jac_indices, construct_global_jac, solve_bvp
label_desc: Use image node_id 27 for calling a global function with example usage: shock_fun(x, y) and returns: np