code: def test_get_segment_start(self):
      random_seed = 42
      num_examples = 50
      num_samples = 2000
  
      _rng = np.random.default_rng(seed=random_seed)
  
      for n in range(num_examples):
          # Generate signal
          signal = _rng.normal(size=num_samples)
          # Random start in the first half
          start = _rng.integers(low=0, high=num_samples // 2)
          # Random length
          end = _rng.integers(low=start, high=num_samples)
          # Selected segment
          segment = signal[start:end]
  
          # UUT
          estimated_start = get_segment_start(
              signal=signal, segment=segment
          )
  
          assert (
              estimated_start == start
          ), f"Example {n}: estimated start ({estimated_start}) not matching the actual start ({start})"
  
imports: import os
  from collections import namedtuple
  from typing import List, Type, Union
  import librosa
  import matplotlib.pyplot
  import numpy
  import pytest
  import scipy
  import soundfile
  import torch
  from nemo.collections.asr.parts.preprocessing.segment import AudioSegment
  from nemo.collections.asr.parts.utils.audio_utils import SOUND_VELOCITY
  from nemo.collections.asr.parts.utils.audio_utils import calculate_sdr_numpy, convmtx_mc_numpy, db2mag, estimated_coherence, generate_approximate_noise_field, get_segment_start, mag2db, pow2db, rms, select_channels, theoretical_coherence, toeplitz
label_desc: Use image node_id 3 for calling the TestAudioUtilsElements obj's underlying member method code with example usage: obj.test_get_segment_start() without return types