class_docstr: A callback that you can pass to the `GradientDescentTrainer` to change the frequency of
  validation during training. If `validation_start` is not `None`, validation will not occur until
  `validation_start` epochs have elapsed. If `validation_interval` is not `None`, validation will
  run every `validation_interval` number of epochs epochs.
code: def _should_validate(self, epoch: int) -> bool:
      should_validate = True
      if (
          self._validation_start is not None
          and epoch < self._validation_start
      ):
          should_validate = False
      elif (
          self._validation_interval is not None
          and epoch % self._validation_interval != 0
      ):
          should_validate = False
      return should_validate
  
file_path: allennlp/allennlp/training/callbacks/should_validate.py
imports: from typing import Dict, Any, TYPE_CHECKING, Optional
  from allennlp.training.callbacks.callback import TrainerCallback
label_desc: Use image node_id 5 for calling the ShouldValidateCallback obj's underlying member method code with example usage: obj._should_validate(epoch) and returns: should_validate