code: def forward(self):
      pass
  
file_path: transformers/src/transformers/models/longformer/convert_longformer_original_pytorch_lightning_to_pytorch.py
imports: import argparse
  import pytorch_lightning
  import torch
  from torch import nn
  from transformers import LongformerForQuestionAnswering, LongformerModel
label_desc: Use image node_id 2 for calling the LightningModel obj's underlying member method code with example usage: obj.forward() without return types