class_docstr: Recorder Model Dataset Loader
class_docstr_tok: ["Recorder","Model","Dataset","Loader"]
code: def __init__(self, rec: Recorder):
      self.rec = rec
  
imports: from abc import ABCMeta, abstractmethod
  from typing import Optional
  import pandas
  from qlib import get_module_logger
  from qlib.data import D
  from qlib.data.dataset import Dataset, DatasetH, TSDatasetH
  from qlib.data.dataset.handler import DataHandlerLP
  from qlib.model import Model
  from qlib.utils import get_date_by_shift
  from qlib.workflow.recorder import Recorder
  from qlib.workflow.record_temp import SignalRecord
label_desc: Use image node_id 1 to create a new RMDLoader object  with example: obj = RMDLoader(rec)