code: def expand_filepaths(base_dir, rel_paths):
      
      return [os.path.join(base_dir, os.path.normpath(rp)) for rp in rel_paths]
docs: Expand a list of relative paths to a give base directory.
  
      Parameters
      ----------
      base_dir : str
          The target base directory
  
      rel_paths : list (or list-like)
          Collection of relative path strings
  
      Returns
      -------
      expanded_paths : list
          `rel_paths` rooted at `base_dir`
  
      Examples
      --------
      >>> jams.util.expand_filepaths('/data', ['audio', 'beat', 'seglab'])
      ['/data/audio', '/data/beat', '/data/seglab']