code: def get_texts_by_index(
      self, texts: Optional[List[List[str]]], index: int
  ) -> Optional[List[str]]:
      if texts is None:
          return None
      return texts[index]
  
imports: from typing import List, Optional, Tuple
  import torch
  from pytext.torchscript.utils import pad_2d_float, pad_3d_float, validate_padding_control
  from pytext.torchscript.vocab import ScriptVocabulary
  from pytorch.text.fb.utils.transform_utils import pad_2d
label_desc: Use image node_id 9 for calling the ScriptTensorizer obj's underlying member method code with example usage: obj.get_texts_by_index(texts, index) and returns: texts, None