code: def test_backprop_multiple_graphs_basic(method):
      shape = (1,)
      dtype = chainerx.float32
  
      with chainerx.backprop_scope(
          "bp1"
      ) as backprop_id1, chainerx.backprop_scope("bp2") as backprop_id2:
          xs = (
              chainerx.full(shape, 2, dtype).require_grad(backprop_id1),
              chainerx.full(shape, 5, dtype).require_grad(backprop_id2),
          )
          expected_gxs = (
              chainerx.full(shape, 5, dtype),
              None,
          )
  
          def fprop(x0, x1):
              return (x0 * x1,)
  
          _check_backprop(
              method, fprop, xs, expected_gxs, backprop_id=backprop_id1
          )
  
imports: import chainerx
  import pytest
label_desc: Use image node_id 19 for calling a global function with example usage: test_backprop_multiple_graphs_basic(method) and returns: unknown