code: def forward(self, *x):
      y = super(MyModel, self).forward(*x)
      return y[0]
  
file_path: singa/examples/onnx/ro_bert_a/ro_bert_a.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, check_exist_or_download
  import logging
  from transformers import RobertaTokenizer
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