code: def export_cumsum_1d() -> None:
      node = onnx.helper.make_node(
          "CumSum", inputs=["x", "axis"], outputs=["y"]
      )
      x = np.array([1.0, 2.0, 3.0, 4.0, 5.0]).astype(np.float64)
      axis = np.int32(0)
      y = np.array([1.0, 3.0, 6.0, 10.0, 15.0]).astype(np.float64)
      expect(node, inputs=[x, axis], outputs=[y], name="test_cumsum_1d")
  
file_path: onnx/onnx/backend/test/case/node/cumsum.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 CumSum obj's underlying member method code with example usage: obj.export_cumsum_1d() without return types