docstr: initialize qlib
docstr_tok: ["initialize","qlib"]
code: def _init_qlib(self):
      """initialize qlib"""
      provider_uri = "~/.qlib/qlib_data/cn_data"  # target_dir
      GetData().qlib_data(
          target_dir=provider_uri, region=REG_CN, exists_skip=True
      )
      qlib.init(provider_uri=provider_uri, region=REG_CN)
  
file_path: qlib/examples/rolling_process_data/workflow.py
imports: import qlib
  import fire
  import pickle
  from datetime import datetime
  from qlib.constant import REG_CN
  from qlib.data.dataset.handler import DataHandlerLP
  from qlib.utils import init_instance_by_config
  from qlib.tests.data import GetData
label_desc: Use image node_id 1 for calling the RollingDataWorkflow obj's underlying member method code with example usage: obj._init_qlib() without return types