code: def _load_internal(
      self, instrument, start_index, end_index, cur_time, period=None
  ):
      from .data import PITD  # pylint: disable=C0415
  
      return PITD.period_feature(
          instrument,
          str(self),
          start_index,
          end_index,
          cur_time,
          period,
      )
  
imports: from __future__ import division
  from __future__ import print_function
  import abc
  import pandas
  from ..log import get_module_logger
label_desc: Use image node_id 2 for calling the PFeature obj's underlying member method code with example usage: obj._load_internal(instrument, start_index, end_index, cur_time, period) and returns: PITD