code: def test_relu_forward_backward(seed, ctx, func_name, shape):
      from nbla_test_utils import cap_ignore_region, function_tester
  
      rng = np.random.RandomState(seed)
      inputs = [
          cap_ignore_region(
              rng.randn(*shape).astype(np.float32) * 2, (-1e-3, 1e-3)
          )
      ]
      function_tester(
          rng, F.relu, ref_relu, inputs, ctx=ctx, func_name=func_name
      )
  
file_path: nnabla/python/test/function/test_relu.py
imports: import pytest
  import numpy
  import nnabla
  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_relu_forward_backward(seed, ctx, func_name, shape) without return types