code: def test_show_stdv(self):
      param = {
          "max_depth": 2,
          "eta": 1,
          "silent": 1,
          "objective": "binary:logistic",
      }
      num_round = 2
      xgb.cv(
          param,
          dtrain,
          num_round,
          nfold=5,
          metrics={"error"},
          seed=0,
          show_stdv=False,
      )
  
file_path: turicreate/src/external/xgboost/tests/python/test_models.py
imports: import numpy
  import xgboost
  import unittest
label_desc: Use image node_id 5 for calling the TestModels obj's underlying member method code with example usage: obj.test_show_stdv() without return types