code: def test_evaluation_monitor(self):
      D_train = xgb.DMatrix(self.X_train, self.y_train)
      D_valid = xgb.DMatrix(self.X_valid, self.y_valid)
      evals_result = {}
      rounds = 10
      xgb.train(
          {"objective": "binary:logistic", "eval_metric": "error"},
          D_train,
          evals=[(D_train, "Train"), (D_valid, "Valid")],
          num_boost_round=rounds,
          evals_result=evals_result,
          verbose_eval=True,
      )
      assert len(evals_result["Train"]["error"]) == rounds
      assert len(evals_result["Valid"]["error"]) == rounds
  
      self.run_evaluation_monitor(D_train, D_valid, rounds, True)
      self.run_evaluation_monitor(D_train, D_valid, rounds, 2)
      self.run_evaluation_monitor(D_train, D_valid, rounds, 4)
      self.run_evaluation_monitor(D_train, D_valid, rounds, rounds + 1)
  
imports: import json
  import os
  import tempfile
  from typing import Union
  import pytest
  import xgboost
  from xgboost import testing
label_desc: Use image node_id 3 for calling the TestCallbacks obj's underlying member method code with example usage: obj.test_evaluation_monitor() without return types