code: def add_char_batch(
      inp: List[List[str]], ind: int, char_val: int
  ) -> List[List[str]]:
      return [add_char(elem, ind, char_val) for elem in inp]
  
file_path: captum/tests/robust/test_min_param_perturbation.py
imports: from typing import cast, List
  import torch
  from captum.robust import MinParamPerturbation
  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 3 for calling a global function with example usage: add_char_batch(inp, ind, char_val) and returns: unknown