code: def update_user_library(library):
      """Update style library with user-defined rc files"""
      for stylelib_path in iter_user_libraries():
          styles = read_style_directory(stylelib_path)
          update_nested_dict(library, styles)
      return library
  
file_path: catboost/contrib/python/matplotlib/py2/matplotlib/style/core.py
imports: from __future__ import absolute_import, division, print_function
  import six
  import os
  import re
  import contextlib
  import warnings
  import matplotlib
  from matplotlib import rc_params_from_file, rcParamsDefault
label_desc: Use image node_id 8 for calling a global function with example usage: update_user_library(library) and returns: library