code: def get_min_samples_leaf(self) -> (int, float):
      default_value = 20
      return self.booster.params.get("min_data_in_leaf", default_value)
  
imports: from collections import defaultdict
  from typing import List, Mapping
  import numpy
  import pandas
  from lightgbm.basic import Booster
  from dtreeviz.models.shadow_decision_tree import ShadowDecTree, VisualisationNotYetSupportedError
  from dtreeviz import utils
label_desc: Use image node_id 28 for calling the ShadowLightGBMTree obj's underlying member method code with example usage: obj.get_min_samples_leaf() and returns: self