code: def test_where_double_backward(seed, ctx, func_name):
      from nbla_test_utils import backward_function_tester
  
      rng = np.random.RandomState(seed)
      inshape = (2, 2)
      inputs = [
          (rng.rand(*inshape) > 0.5).astype(np.float32),
          rng.randn(*inshape),
          rng.randn(*inshape),
      ]
      backward_function_tester(
          rng,
          F.where,
          inputs,
          backward=[False, True, True],
          dstep=1e3,
          ctx=ctx,
      )
  
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_where_double_backward(seed, ctx, func_name) without return types