code: def test_line_search(self):
      def f(x):
          return jnp.cos(jnp.sum(jnp.exp(-x)) ** 2)
  
      # assert not line_search(jax.value_and_grad(f), np.ones(2), np.array([-0.5, -0.25])).failed
      xk = jnp.ones(2)
      pk = jnp.array([-0.5, -0.25], dtype=xk.dtype)
      res = line_search(f, xk, pk, maxiter=100)
  
      with jax.numpy_dtype_promotion("standard"):
          scipy_res = scipy.optimize.line_search(f, grad(f), xk, pk)
  
      self.assertAllClose(
          scipy_res[0], res.a_k, atol=1e-5, check_dtypes=False
      )
      self.assertAllClose(
          scipy_res[3], res.f_k, atol=1e-5, check_dtypes=False
      )
  
imports: from absl.testing import absltest
  import scipy.optimize
  import jax
  from jax import grad
  from jax import config
  import jax.numpy
  import jax._src.test_util
  from jax._src.scipy.optimize.line_search import line_search
label_desc: Use image node_id 11 for calling the TestLineSearch obj's underlying member method code with example usage: obj.test_line_search() and returns: jnp