docstr: initialize qlib
docstr_tok: ["initialize","qlib"]
code: def _init_qlib(self, qlib_conf):
      """initialize qlib"""
  
      qlib.init(
          region=REG_CN,
          auto_mount=False,
          custom_ops=[
              DayLast,
              FFillNan,
              BFillNan,
              Date,
              Select,
              IsNull,
              IsInf,
              Cut,
          ],
          expression_cache=None,
          **qlib_conf,
      )
  
imports: import os
  import time
  import datetime
  from typing import Optional
  import qlib
  from qlib import get_module_logger
  from qlib.data import D
  from qlib.config import REG_CN
  from qlib.utils import init_instance_by_config
  from qlib.data.dataset.handler import DataHandlerLP
  from qlib.data.data import Cal
  from qlib.contrib.ops.high_freq import get_calendar_day, DayLast, FFillNan, BFillNan, Date, Select, IsNull, IsInf, Cut
  import pickle
  from joblib import Parallel, delayed
label_desc: Use image node_id 4 for calling the HighFreqProvider obj's underlying member method code with example usage: obj._init_qlib(qlib_conf) without return types