file_path: NeMo/tests/collections/asr/test_label_datasets.py
imports: import json
  import os
  import tempfile
  import numpy
  import pytest
  import soundfile
  import torch
  from nemo.collections.asr.data.audio_to_label import AudioToMultiLabelDataset, TarredAudioToClassificationLabelDataset
  from nemo.collections.asr.data.feature_to_label import FeatureToLabelDataset, FeatureToSeqSpeakerLabelDataset
  from nemo.collections.asr.parts.preprocessing.feature_loader import ExternalFeatureLoader
  from nemo.collections.asr.parts.preprocessing.features import WaveformFeaturizer
label_desc: Use image node_id 3 for calling the TestASRDatasets obj's underlying member method code with example usage: obj.test_feat_seqlabel_dataset(test_data_dir) without return types