code: def export_gelu_default() -> None:
      node = onnx.helper.make_node("Gelu", inputs=["x"], outputs=["y"])
  
      x = np.array([-1, 0, 1]).astype(np.float32)
      # expected output [-0.15865526, 0., 0.84134474]
      y = (
          0.5 * x * (1 + np.vectorize(math.erf)(x / np.sqrt(2)))
      ).astype(np.float32)
      expect(node, inputs=[x], outputs=[y], name="test_gelu_default_1")
  
      x = np.random.randn(3, 4, 5).astype(np.float32)
      # expected output [2.99595031, 3.99987331, 4.99999857]
      y = (
          0.5 * x * (1 + np.vectorize(math.erf)(x / np.sqrt(2)))
      ).astype(np.float32)
      expect(node, inputs=[x], outputs=[y], name="test_gelu_default_2")
  
file_path: onnx/onnx/backend/test/case/node/gelu.py
imports: import math
  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 2 for calling the Gelu obj's underlying member method code with example usage: obj.export_gelu_default() without return types