code: def __init__(self, dtype: str = "bool"):
      self.dtype = dtype
  
file_path: qlib/qlib/contrib/data/highfreq_processor.py
imports: import os
  import numpy
  import pandas
  from qlib.data.dataset.processor import Processor
  from qlib.data.dataset.utils import fetch_df_by_index
  from typing import Dict
label_desc: Use image node_id 1 to create a new HighFreqTrans object from inherited base classes: Processor with example: obj = HighFreqTrans(dtype)