code: def test_double_backward(seed, ishape, index, oshape, ctx, func_name):
      from nbla_test_utils import backward_function_tester
  
      rng = np.random.RandomState(seed)
      inputs = [
          rng.randn(*ishape).astype(np.float32),
          np.array(index) * 0.1,
      ]
      backward_function_tester(
          rng,
          F.scatter_nd,
          inputs,
          func_args=[oshape],
          ctx=ctx,
          backward=[True, False],
          atol_accum=1e-2,
      )
  
imports: import pytest
  import numpy
  import nnabla.functions
  from nbla_test_utils import list_context, function_tester
label_desc: Use image node_id 3 for calling a global function with example usage: test_double_backward(seed, ishape, index, oshape, ctx, func_name) without return types