code: def string_batch_perturb(inp: List[List[str]]) -> List[List[str]]:
      return [string_perturb(elem) for elem in inp]
  
imports: import collections
  from typing import List
  import torch
  from captum.robust import AttackComparator, FGSM
  from tests.helpers.basic import assertTensorAlmostEqual, BaseTest
  from tests.helpers.basic_models import BasicModel, BasicModel_MultiLayer
  from torch import Tensor
label_desc: Use image node_id 7 for calling a global function with example usage: string_batch_perturb(inp) and returns: unknown