code: def test_double_backward(seed, ishape, index, 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)]
      backward_function_tester(
          rng, F.gather_nd, inputs, ctx=ctx, backward=[True, False]
      )
  
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, ctx, func_name) without return types