code: def test_abs_double_backward(seed, ctx, func_name):
      from nbla_test_utils import (
          cap_ignore_region,
          backward_function_tester,
      )
  
      rng = np.random.RandomState(seed)
      inputs = []
      for _ in range(2):
          inputs.append(
              rng.randn(
                  2,
                  3,
              ).astype(np.float32)
              * 2
          )
  
      backward_function_tester(
          rng, F.absolute_error, inputs, ctx=ctx, atol_accum=1e-3
      )
  
imports: import pytest
  import numpy
  import nnabla.functions
  from nbla_test_utils import list_context
label_desc: Use image node_id 2 for calling a global function with example usage: test_abs_double_backward(seed, ctx, func_name) without return types