code: def setup(app):
      app.add_css_file("custom.css")
  
file_path: xgboost/doc/conf.py
imports: import os
  import re
  import shutil
  import subprocess
  import sys
  import tarfile
  import urllib.request
  import warnings
  from urllib.error import HTTPError
  from sh.contrib import git
  import xgboost
label_desc: Use image node_id 3 for calling a global function with example usage: setup(app) without return types