code: def _line_func_1(self, x):
      f = jnp.dot(x, x)
      df = 2 * x
      return f, df
  
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 6 for calling the TestLineSearch obj's underlying member method code with example usage: obj._line_func_1(x) and returns: f,  df