code: def shape_reference_impl(x, start=None, end=None):  # type: ignore
      dims = x.shape[start:end]
      return np.array(dims).astype(np.int64)
  
file_path: onnx/onnx/backend/test/case/node/shape.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 a global function with example usage: shape_reference_impl(x, start, end) and returns: np