code: def _run(self, data, pads=None, mode=None, value=None):  # type: ignore
      if value is None:
          value = 0
      return (_pad_impl(data, pads, mode=mode, constant_values=value),)
  
file_path: onnx/onnx/reference/ops/op_pad.py
imports: import numpy
  from onnx.reference.op_run import OpRun
label_desc: Use image node_id 1 for calling the Pad_2 obj's underlying member method code with example usage: obj._run(data, pads, mode, value) and returns: _pad_impl