code: def export() -> None:
      node = onnx.helper.make_node(
          "Round",
          inputs=["x"],
          outputs=["y"],
      )
  
      x = np.array(
          [
              0.1,
              0.5,
              0.9,
              1.2,
              1.5,
              1.8,
              2.3,
              2.5,
              2.7,
              -1.1,
              -1.5,
              -1.9,
              -2.2,
              -2.5,
              -2.8,
          ]
      ).astype(np.float32)
      y = np.array(
          [
              0.0,
              0.0,
              1.0,
              1.0,
              2.0,
              2.0,
              2.0,
              2.0,
              3.0,
              -1.0,
              -2.0,
              -2.0,
              -2.0,
              -2.0,
              -3.0,
          ]
      ).astype(
          np.float32
      )  # expected output
      expect(node, inputs=[x], outputs=[y], name="test_round")
  
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 1 for calling the Round obj's underlying member method code with example usage: obj.export() without return types