class_docstr: Tacotron 2 Model that is used to generate mel spectrograms from text
code: def parser(self):
      if self._parser is not None:
          return self._parser
  
      ds_class_name = self._cfg.train_ds.dataset._target_.split(".")[-1]
      if ds_class_name == "TTSDataset":
          self._parser = None
      elif hasattr(self._cfg, "labels"):
          self._parser = parsers.make_parser(
              labels=self._cfg.labels,
              name="en",
              unk_id=-1,
              blank_id=-1,
              do_normalize=True,
              abbreviation_version="fastpitch",
              make_table=False,
          )
      else:
          raise ValueError(
              "Wanted to setup parser, but model does not have necessary paramaters"
          )
  
      return self._parser
  
imports: import contextlib
  from dataclasses import dataclass, field
  from typing import Any, Dict, List, Optional
  import torch
  from hydra.utils import instantiate
  from omegaconf import MISSING, DictConfig, OmegaConf, open_dict
  from omegaconf.errors import ConfigAttributeError
  from pytorch_lightning.loggers import TensorBoardLogger, WandbLogger
  from torch import nn
  from nemo.collections.common.parts.preprocessing import parsers
  from nemo.collections.tts.losses.tacotron2loss import Tacotron2Loss
  from nemo.collections.tts.models.base import SpectrogramGenerator
  from nemo.collections.tts.parts.utils.helpers import g2p_backward_compatible_support, get_mask_from_lengths, tacotron2_log_to_tb_func, tacotron2_log_to_wandb_func
  from nemo.core.classes.common import PretrainedModelInfo, typecheck
  from nemo.core.neural_types.elements import AudioSignal, EmbeddedTextType, LengthsType, LogitsType, MelSpectrogramType, SequenceToSequenceAlignmentType
  from nemo.core.neural_types.neural_type import NeuralType
  from nemo.utils import logging, model_utils
label_desc: Use image node_id 2 for calling the Tacotron2Model obj's underlying member method code with example usage: obj.parser() and returns: self, self