code: def _run(self, a, b):  # type: ignore
      with catch_warnings():
          simplefilter("ignore")
          return (np.power(a, b).astype(a.dtype),)
  
imports: from warnings import catch_warnings, simplefilter
  import numpy
  from onnx.reference.op_run import OpRun
label_desc: Use image node_id 1 for calling the Pow obj's underlying member method code with example usage: obj._run(a, b) and returns: np