code: def forward(self, batch, tokenizer, compute_loss: bool = False):
      raise NotImplementedError
  
imports: import abc
  import torch
  import torch.nn
  from typing import Callable
  import jiant.proj.main.modeling.heads
  from jiant.proj.main.components.outputs import LogitsAndLossOutput
  from jiant.proj.main.components.outputs import LogitsOutput
  from jiant.utils.python.datastructures import take_one
  from jiant.tasks.core import TaskTypes
label_desc: Use image node_id 2 for calling the Taskmodel obj's underlying member method code with example usage: obj.forward(batch, tokenizer, compute_loss) without return types