code: def _get_pack_en_hist_schema(self, pk, evaluator, dtypes):
      return {
          "gh": {
              "type": "ciphertext",
              "stride": 1,
              "pk": pk,
              "evaluator": evaluator,
              "dtype": dtypes["gh"],
          },
          "cnt": {
              "type": "plaintext",
              "stride": 1,
              "dtype": dtypes["cnt"],
          },
      }
  
imports: import typing
  import torch
  from typing import Dict
  from fate.arch.histogram import HistogramBuilder, DistributedHistogram
  from fate.ml.ensemble.learner.decision_tree.tree_core.decision_tree import Node
  from typing import List
  import numpy
  from fate.arch.dataframe import DataFrame
  from fate.arch import Context
  import logging
label_desc: Use image node_id 4 for calling the SBTHistogramBuilder obj's underlying member method code with example usage: obj._get_pack_en_hist_schema(pk, evaluator, dtypes) and returns: dict