code: def calculate_desired_noise_rms(clean_rms, snr):
      """
      Given the Root Mean Square (RMS) of a clean sound and a desired signal-to-noise ratio (SNR),
      calculate the desired RMS of a noise sound to be mixed in.
      Based on https://github.com/Sato-Kunihiko/audio-SNR/blob/8d2c933b6c0afe6f1203251f4877e7a1068a6130/create_mixed_audio_file.py#L20
      :param clean_rms: Root Mean Square (RMS) - a value between 0.0 and 1.0
      :param snr: Signal-to-Noise (SNR) Ratio in dB - typically somewhere between -20 and 60
      :return:
      """
      a = float(snr) / 20
      noise_rms = clean_rms / (10**a)
      return noise_rms
  
file_path: audiomentations/audiomentations/core/utils.py
imports: import os
  from functools import lru_cache
  from pathlib import Path
  from typing import List, Union, Tuple
  import math
  import numpy
  from numpy.typing import NDArray
label_desc: Use image node_id 5 for calling a global function with example usage: calculate_desired_noise_rms(clean_rms, snr) and returns: noise_rms