code: def labels(self) -> np.array([str]):
      current_file_path = os.path.dirname(os.path.realpath(__file__))
      pkl_file_path = os.path.join(
          current_file_path, "asl_20_actions_map.pkl"
      )
      with open(pkl_file_path, "rb") as f:
          action_to_index_map = pkl.load(f)
      actions_arr = [""] * len(action_to_index_map)
      for action, index in action_to_index_map.items():
          actions_arr[index] = action
      return np.asarray(actions_arr)
  
file_path: evadb/evadb/functions/asl_action_recognition.py
imports: import os
  import pickle
  import numpy
  import pandas
  from evadb.functions.abstract.pytorch_abstract_function import PytorchAbstractClassifierFunction
  from evadb.utils.generic_utils import try_to_import_torch, try_to_import_torchvision
label_desc: Use image node_id 4 for calling the ASLActionRecognition obj's underlying member method code with example usage: obj.labels() and returns: np