code: def test_for_loop_can_implement_cumsum(self, for_impl):
      def cumsum(x):
          def body(i, refs):
              x_ref, accum_ref = refs
              accum_ref[i + 1] = accum_ref[i] + x_ref[i]
  
          accum = jnp.zeros(x.shape[0] + 1, x.dtype)
          _, accum_out = for_impl(x.shape[0], body, (x, accum))
          return accum_out[1:]
  
      key = jax.random.PRNGKey(0)
      x = jax.random.normal(key, (8,))
      np.testing.assert_allclose(cumsum(x), jnp.cumsum(x))
  
imports: from functools import partial
  from absl.testing import absltest
  from absl.testing import parameterized
  import numpy
  import jax
  from jax import random
  from jax._src import test_util
  from jax._src.lax.control_flow import for_loop
  import jax.numpy
  from jax import config
label_desc: Use image node_id 8 for calling the ForLoopTest obj's underlying member method code with example usage: obj.test_for_loop_can_implement_cumsum(for_impl) and returns: accum_out