code: def export() -> None:
      node = onnx.helper.make_node(
          "Identity",
          inputs=["x"],
          outputs=["y"],
      )
  
      data = np.array(
          [
              [
                  [
                      [1, 2],
                      [3, 4],
                  ]
              ]
          ],
          dtype=np.float32,
      )
  
      expect(node, inputs=[data], outputs=[data], name="test_identity")
  
file_path: onnx/onnx/backend/test/case/node/identity.py
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 Identity obj's underlying member method code with example usage: obj.export() without return types