code: def __init__(
      self, task, encoder, head: heads.SpanComparisonHead, **kwargs
  ):
      super().__init__(task=task, encoder=encoder, head=head)
  
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 1 to create a new SpanComparisonModel object from inherited base classes: Taskmodel with example: obj = SpanComparisonModel(task, encoder, head)