code: def export_opset19() -> None:
      node = onnx.helper.make_node(
          "DFT", inputs=["x"], outputs=["y"], axis=1
      )
      x = np.arange(0, 100).reshape(10, 10).astype(np.float32)
      y = np.fft.fft(x, axis=0)
  
      x = x.reshape(1, 10, 10, 1)
      y = (
          np.stack((y.real, y.imag), axis=2)
          .astype(np.float32)
          .reshape(1, 10, 10, 2)
      )
      expect(
          node,
          inputs=[x],
          outputs=[y],
          name="test_dft_opset19",
          opset_imports=[onnx.helper.make_opsetid("", 19)],
      )
  
      node = onnx.helper.make_node(
          "DFT", inputs=["x"], outputs=["y"], axis=2
      )
      x = np.arange(0, 100).reshape(10, 10).astype(np.float32)
      y = np.fft.fft(x, axis=1)
  
      x = x.reshape(1, 10, 10, 1)
      y = (
          np.stack((y.real, y.imag), axis=2)
          .astype(np.float32)
          .reshape(1, 10, 10, 2)
      )
      expect(
          node,
          inputs=[x],
          outputs=[y],
          name="test_dft_axis_opset19",
          opset_imports=[onnx.helper.make_opsetid("", 19)],
      )
  
      node = onnx.helper.make_node(
          "DFT", inputs=["x"], outputs=["y"], inverse=1, axis=1
      )
      x = np.arange(0, 100, dtype=np.complex64).reshape(
          10,
          10,
      )
      y = np.fft.ifft(x, axis=0)
  
      x = (
          np.stack((x.real, x.imag), axis=2)
          .astype(np.float32)
          .reshape(1, 10, 10, 2)
      )
      y = (
          np.stack((y.real, y.imag), axis=2)
          .astype(np.float32)
          .reshape(1, 10, 10, 2)
      )
      expect(
          node,
          inputs=[x],
          outputs=[y],
          name="test_dft_inverse_opset19",
          opset_imports=[onnx.helper.make_opsetid("", 19)],
      )
  
file_path: onnx/onnx/backend/test/case/node/dft.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 DFT obj's underlying member method code with example usage: obj.export_opset19() without return types