code: def ratio_to_db(ratio, val2=None, using_amplitude=True):
      """
      Converts the input float to db, which represents the equivalent
      to the ratio in power represented by the multiplier passed in.
      """
      ratio = float(ratio)
  
      # accept 2 values and use the ratio of val1 to val2
      if val2 is not None:
          ratio = ratio / val2
  
      # special case for multiply-by-zero (convert to silence)
      if ratio == 0:
          return -float("inf")
  
      if using_amplitude:
          return 20 * log(ratio, 10)
      else:  # using power
          return 10 * log(ratio, 10)
  
imports: from __future__ import division
  from io import BufferedReader
  import json
  import os
  import re
  import sys
  from subprocess import Popen, PIPE
  from math import log, ceil
  from tempfile import TemporaryFile
  from warnings import warn
  from functools import wraps
label_desc: Use image node_id 6 for calling a global function with example usage: ratio_to_db(ratio, val2, using_amplitude) and returns: unknown, unknown, unknown