code: def convert_PowVarVar(
      func, opset_version, input_names, output_names, context
  ):
      if opset_version == 1 or opset_version == 7:
          return (
              onnx_helper.make_node("Pow", input_names, output_names),
          )
  
imports: import numpy
  from onnx.mapping import NP_TYPE_TO_TENSOR_TYPE
  from onnx_chainer.functions.opset_version import support
  from onnx_chainer import onnx_helper
label_desc: Use image node_id 16 for calling a global function with example usage: convert_PowVarVar(func, opset_version, input_names, output_names, context) and returns: onnx_helper