code: def _get_samples_on_leaves(self, sample_pos: DataFrame):
      x = sample_pos < 0
      samples_on_leaves = sample_pos.iloc(x)
      return samples_on_leaves
  
imports: import numpy
  import pandas
  from fate.arch import Context
  from fate.arch.dataframe import DataFrame
  from fate.ml.ensemble.learner.decision_tree.tree_core.splitter import SplitInfo
  from typing import List
  import logging
label_desc: Use image node_id 12 for calling the DecisionTree obj's underlying member method code with example usage: obj._get_samples_on_leaves(sample_pos) and returns: samples_on_leaves