code: def _run(self, mat, split=None, axis=None):  # type: ignore
      return self.common_run(mat, split, axis=axis, num_outputs=None)
  
file_path: onnx/onnx/reference/ops/op_split.py
imports: from onnx.reference.op_run import OpRun
label_desc: Use image node_id 1 for calling the Split_13 obj's underlying member method code with example usage: obj._run(mat, split, axis) and returns: self