code: def xgboost_installed():
      
      try:
          import xgboost
      except ImportError:
          return False
      from xgboost.core import _LIB
      try:
          _LIB.XGBoosterDumpModelEx
      except AttributeError:
          # The version is not recent enough even though it is version 0.6.
          # You need to install xgboost from github and not from pypi.
          return False
      from xgboost import __version__
      vers = LooseVersion(__version__)
      allowed = LooseVersion('0.7')
      if vers < allowed:
          warnings.warn('The converter works for xgboost >= 0.7. Earlier versions might not.')
      return True
docs: Checks that *xgboost* is available.