class_docstr: LightGBM (F)eature (Int)erpreter
code: def __init__(self):
      self.model = None
  
file_path: qlib/qlib/model/interpret/base.py
imports: import pandas
  from abc import abstractmethod
label_desc: Use image node_id 1 to create a new LightGBMFInt object from inherited base classes: FeatureInt with example: obj = LightGBMFInt()