class_docstr: This processor is designed for Alpha158. And will be replaced by simple processors in the future
code: def __call__(self, df):
      return self._transform(df)
  
file_path: qlib/qlib/contrib/data/processor.py
imports: import numpy
  from ...log import TimeInspector
  from ...data.dataset.processor import Processor, get_group_columns
label_desc: Use image node_id 2 for calling the ConfigSectionProcessor obj's underlying member method code with example usage: obj.__call__(df) and returns: self