code: def test_pretrained_ambernet_logits(self, test_data_dir):
      model_name = "langid_ambernet"
      lang_model = EncDecSpeakerLabelModel.from_pretrained(model_name)
      assert isinstance(lang_model, EncDecSpeakerLabelModel)
      relative_filepath = (
          "an4_speaker/an4/wav/an4_clstk/fash/an255-fash-b.wav"
      )
      filename = os.path.join(test_data_dir, relative_filepath)
  
      label = lang_model.get_label(filename)
  
      assert label == "en"
  
file_path: NeMo/tests/collections/asr/test_speaker_label_models.py
imports: import json
  import os
  import tempfile
  from unittest import TestCase
  import pytest
  import torch
  from omegaconf import DictConfig
  from nemo.collections.asr.models import EncDecSpeakerLabelModel
label_desc: Use image node_id 2 for calling the TestEncDecSpeechLabelModel obj's underlying member method code with example usage: obj.test_pretrained_ambernet_logits(test_data_dir) without return types