class_docstr: Produces inputs and answer spans for Squad.
class_docstr_tok: ["Produces","inputs","and","answer","spans","for","Squad","."]
code: def sort_key(self, row):
      raise NotImplementedError(
          "SquadTensorizer.sort_key() should not be called."
      )
  
imports: from typing import List
  import torch
  from pytext.common.constants import SpecialTokens
  from pytext.config.component import ComponentType, create_component
  from pytext.data.tensorizers import TokenTensorizer
  from pytext.data.tokenizers import Tokenizer, WordPieceTokenizer
  from pytext.data.utils import pad_and_tensorize, VocabBuilder, Vocabulary
label_desc: Use image node_id 7 for calling the SquadTensorizer obj's underlying member method code with example usage: obj.sort_key(row) without return types