code: def test_backprop_add_mul_extra_inputs(method):
      shape = (1,)
      dtype = chainerx.float32
  
      xs = (
          chainerx.full(shape, 2, dtype).require_grad(),
          chainerx.full(shape, 3, dtype).require_grad(),
          chainerx.full(shape, 4, dtype),
      )
      expected_gxs = (
          chainerx.full(shape, 7, dtype),
          chainerx.full(shape, 2, dtype),
          None,
      )
  
      def fprop(x0, x1, x2):
          return (x0 * (x1 + x2),)
  
      _check_backprop(method, fprop, xs, expected_gxs)
  
imports: import chainerx
  import pytest
label_desc: Use image node_id 10 for calling a global function with example usage: test_backprop_add_mul_extra_inputs(method) and returns: unknown