code: def truncate(f, n=TREE_DECIMAL_ROUND):
      return np.floor(f * 10**n) / 10**n
  
imports: import torch
  import numpy
  import logging
  from fate.arch.dataframe import DataFrame
  from fate.arch import Context
  from fate.arch.histogram import DistributedHistogram
label_desc: Use image node_id 3 for calling the SBTSplitter obj's underlying member method code with example usage: obj.truncate(f, n) and returns: unknown