code: def n_tokens_mlm(c: Configs):
      """
      Number of tokens including `[PAD]` and `[MASK]`
      """
      return c.text.n_tokens + 2
  
imports: from typing import List
  import torch
  from torch import nn
  from labml import experiment, tracker, logger
  from labml.configs import option
  from labml.logger import Text
  from labml_helpers.metrics.accuracy import Accuracy
  from labml_helpers.module import Module
  from labml_helpers.train_valid import BatchIndex
  from labml_nn.experiments.nlp_autoregression import NLPAutoRegressionConfigs
  from labml_nn.transformers import Encoder, Generator
  from labml_nn.transformers import TransformerConfigs
  from labml_nn.transformers.mlm import MLM
label_desc: Use image node_id 1 for calling a global function with example usage: n_tokens_mlm(c) and returns: unknown