code: def forward(self, *x):
      y = super(MyModel, self).forward(*x)
      return y[0]
  
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 the MyModel obj's underlying member method code with example usage: obj.forward() and returns: y