class_docstr: Token Classification Model with BERT, applicable for tasks such as Named Entity Recognition
class_docstr_tok: ["Token","Classification","Model","with","BERT",",","applicable","for","tasks","such","as","Named","Entity","Recognition"]
code: def setup_validation_data(
      self, val_data_config: Optional[DictConfig] = None
  ):
      if val_data_config is None:
          val_data_config = self._cfg.validation_ds
  
      labels_file = os.path.join(
          self._cfg.dataset.data_dir, val_data_config.labels_file
      )
      get_label_ids(
          label_file=labels_file,
          is_training=False,
          pad_label=self._cfg.dataset.pad_label,
          label_ids_dict=self._cfg.label_ids,
          get_weights=False,
      )
  
      self._validation_dl = self._setup_dataloader_from_config(
          cfg=val_data_config
      )
  
imports: import os
  from typing import List, Optional, Union
  import torch
  from omegaconf import DictConfig, OmegaConf
  from pytorch_lightning import Trainer
  from torch.utils.data import DataLoader
  from nemo.collections.common.losses import CrossEntropyLoss
  from nemo.collections.nlp.data.data_utils.data_preprocessing import get_labels_to_labels_id_mapping
  from nemo.collections.nlp.data.token_classification.token_classification_dataset import BertTokenClassificationDataset, BertTokenClassificationInferDataset
  from nemo.collections.nlp.data.token_classification.token_classification_utils import get_label_ids
  from nemo.collections.nlp.metrics.classification_report import ClassificationReport
  from nemo.collections.nlp.models.nlp_model import NLPModel
  from nemo.collections.nlp.modules.common import TokenClassifier
  from nemo.collections.nlp.parts.utils_funcs import get_classification_report, plot_confusion_matrix, tensor2list
  from nemo.core.classes.common import PretrainedModelInfo, typecheck
  from nemo.utils import logging
label_desc: Use image node_id 11 for calling the TokenClassificationModel obj's underlying member method code with example usage: obj.setup_validation_data(val_data_config) without return types