code: def _run(self, *args, axis=None):  # type: ignore
      targs = tuple(self._preprocess(a, axis) for a in args)
      return (np.concatenate(targs, axis),)
  
imports: import numpy
  from onnx.reference.op_run import OpRun
label_desc: Use image node_id 2 for calling the Concat obj's underlying member method code with example usage: obj._run() and returns: np