class_docstr: Internal log evaluation callable class.
class_docstr_tok: ["Internal","log","evaluation","callable","class","."]
code: def __init__(self, period: int = 1, show_stdv: bool = True) -> None:
      self.order = 10
      self.before_iteration = False
  
      self.period = period
      self.show_stdv = show_stdv
  
imports: from collections import OrderedDict
  from dataclasses import dataclass
  from functools import partial
  from typing import TYPE_CHECKING, Any, Callable, Dict, List, Optional, Union
  from .basic import Booster, _ConfigAliases, _LGBM_BoosterEvalMethodResultType, _LGBM_BoosterEvalMethodResultWithStandardDeviationType, _log_info, _log_warning
label_desc: Use image node_id 1 to create a new _LogEvaluationCallback object  with example: obj = _LogEvaluationCallback(period, show_stdv)