code: def __init__(self, onnx_node, run_params):  # type: ignore
      OpRunUnaryNum.__init__(self, onnx_node, run_params)
      self._erf = np.vectorize(erf)
  
imports: from math import erf
  import numpy
  from onnx.reference.ops._op import OpRunUnaryNum
label_desc: Use image node_id 1 to create a new Erf object from inherited base classes: OpRunUnaryNum with example: obj = Erf(onnx_node, run_params)