code: def test_backprop_identical_intermediate_nodes(method):
      shape = (1,)
      dtype = chainerx.float32
  
      xs = (chainerx.full(shape, 2, dtype).require_grad(),)
      expected_gxs = (chainerx.full(shape, 4, dtype),)
  
      def fprop(x):
          h = x + x
          return (h + h,)
  
      _check_backprop(method, fprop, xs, expected_gxs)
  
imports: import chainerx
  import pytest
label_desc: Use image node_id 16 for calling a global function with example usage: test_backprop_identical_intermediate_nodes(method) and returns: unknown