code: def _load_feature(self, instrument, start_index, end_index, cur_time):
      return self.feature.load(
          instrument, start_index, end_index, cur_time
      )
  
file_path: qlib/qlib/data/pit.py
imports: import numpy
  import pandas
  from qlib.data.ops import ElemOperator
  from qlib.log import get_module_logger
  from .data import Cal
label_desc: Use image node_id 2 for calling the P obj's underlying member method code with example usage: obj._load_feature(instrument, start_index, end_index, cur_time) and returns: self