code: def test_ceil_forward_backward(seed, ctx, func_name):
      from nbla_test_utils import cap_ignore_region, function_tester
  
      rng = np.random.RandomState(seed)
      inputs = [rng.randn(2, 3, 4).astype(np.float32) * 2]
  
      function_tester(
          rng,
          F.ceil,
          ref_ceil,
          inputs,
          atol_b=1e-3,
          backward=[True],
          ctx=ctx,
          func_name=func_name,
          ref_grad=ref_grad_ceil,
      )
  
file_path: nnabla/python/test/function/test_ceil.py
imports: import pytest
  import numpy
  import nnabla.functions
  from nbla_test_utils import list_context
label_desc: Use image node_id 3 for calling a global function with example usage: test_ceil_forward_backward(seed, ctx, func_name) without return types