code: def silent(input_filepath, threshold=0.001):
      '''
      Determine if an input file is silent.
  
      Parameters
      ----------
      input_filepath : str
          The input filepath.
      threshold : float
          Threshold for determining silence
  
      Returns
      -------
      is_silent : bool
          True if file is determined silent.
      '''
      validate_input_file(input_filepath)
      stat_dictionary = stat(input_filepath)
      mean_norm = stat_dictionary['Mean    norm']
      if mean_norm is not float('nan'):
          if mean_norm >= threshold:
              return False
          else:
              return True
      else:
          return Truf silent(input_filepath, threshold=0.001):
      '''
      Determine if an input file is silent.
  
      Parameters
      ----------
      input_filepath : str
          The input filepath.
      threshold : float
          Threshold for determining silence
  
      Returns
      -------
      is_silent : bool
          True if file is determined silent.
      '''
      validate_input_file(input_filepath)
      stat_dictionary = stat(input_filepath)
      mean_norm = stat_dictionary['Mean    norm']
      if mean_norm is not float('nan'):
          if mean_norm >= threshold:
              return False
          else:
              return True
      else:
          return True
docs: Determine if an input file is silent.
  
      Parameters
      ----------
      input_filepath : str
          The input filepath.
      threshold : float
          Threshold for determining silence
  
      Returns
      -------
      is_silent : bool
          True if file is determined silent.