code: def postprocess(out):
      text = tokenizer.decode(out)
      return text
  
file_path: singa/examples/onnx/gpt2/gpt2.py
imports: import os
  import numpy
  from singa import device
  from singa import tensor
  from singa import sonnx
  from singa import autograd
  import onnx
  import sys
  from utils import download_model
  import logging
  from transformers import GPT2Tokenizer
label_desc: Use image node_id 2 for calling a global function with example usage: postprocess(out) and returns: text