code: def export_triu_zero() -> None:
      node = onnx.helper.make_node(
          "Trilu",
          inputs=["x", "k"],
          outputs=["y"],
      )
  
      x = np.random.randint(10, size=(0, 5)).astype(np.int64)
      k = np.array(6).astype(np.int64)
      # X:
      # []
      # expect result:
      # []
      y = triu_reference_implementation(x, int(k))
      expect(node, inputs=[x, k], outputs=[y], name="test_triu_zero")
  
imports: import numpy
  import onnx
  from onnx.backend.test.case.base import Base
  from onnx.backend.test.case.node import expect
label_desc: Use image node_id 9 for calling the Trilu obj's underlying member method code with example usage: obj.export_triu_zero() without return types