code: def contrast(
      waveform,
      sample_rate: int = 16000,
      enhancement_amount: float = 75.0,
  ):
      """Apply contrast effect to the input signal to make it sound louder.
  
      Args:
          waveform (torch.Tensor): audio signal (..., time)
          sample_rate (int): sampling rate in Hz (not used)
          enhancement_amount (float): controls the amount of the enhancement
              Allowed range of values for enhancement_amount : 0-100
              Note that enhancement_amount = 0 still gives a significant
              contrast enhancement.
  
      Returns:
          ret (torch.Tensor): filtered signal (..., time)
      """
      ret = torchaudio.functional.contrast(waveform, enhancement_amount)
      return ret
  
imports: import math
  import random
  from typing import Dict, List, Optional, Tuple, Union
  import numpy
  import torch
  import torchaudio
label_desc: Use image node_id 6 for calling a global function with example usage: contrast(waveform, sample_rate, enhancement_amount) and returns: ret