old_contents: from .batch import Batch
  from .example import Example
  from .field import RawField, Field, ReversibleField, SubwordField, NestedField, LabelField
  from .iterator import (batch, BucketIterator, Iterator, BPTTIterator, pool)
  from .pipeline import Pipeline
  from .dataset import Dataset, TabularDataset
  # Those are not in the legacy folder.
  from ...data.metrics import bleu_score
  from ...data.utils import get_tokenizer, interleave_keys
  from ...data.functional import generate_sp_model, \
      load_sp_model, \
      sentencepiece_numericalizer, \
      sentencepiece_tokenizer, custom_replace, simple_space_split, \
      numericalize_tokens_from_iterator
  
  __all__ = ["Batch",
             "Example",
             "RawField", "Field", "ReversibleField", "SubwordField", "NestedField",
             "LabelField",
             "batch", "BucketIterator", "Iterator", "BPTTIterator", "pool",
             "Pipeline",
             "Dataset", "TabularDataset",
             "bleu_score",
             "get_tokenizer", "interleave_keys",
             "generate_sp_model", "load_sp_model",
             "sentencepiece_numericalizer", "sentencepiece_tokenizer",
             "custom_replace", "simple_space_split",
             "numericalize_tokens_from_iterator"]
  
new_contents: from .batch import Batch
  from .example import Example
  from .field import RawField, Field, ReversibleField, SubwordField, NestedField, LabelField
  from .iterator import (batch, BucketIterator, Iterator, BPTTIterator, pool)
  from .pipeline import Pipeline
  from .dataset import Dataset, TabularDataset
  # Those are not in the legacy folder.
  from ...data import metrics
  from ...data.metrics import bleu_score
  from ...data import utils
  from ...data.utils import get_tokenizer, interleave_keys
  from ...data import functional
  from ...data.functional import generate_sp_model, \
      load_sp_model, \
      sentencepiece_numericalizer, \
      sentencepiece_tokenizer, custom_replace, simple_space_split, \
      numericalize_tokens_from_iterator
  
  __all__ = ["Batch",
             "Example",
             "RawField", "Field", "ReversibleField", "SubwordField", "NestedField",
             "LabelField",
             "batch", "BucketIterator", "Iterator", "BPTTIterator", "pool",
             "Pipeline",
             "Dataset", "TabularDataset",
             "metrics",
             "bleu_score",
             "utils",
             "get_tokenizer", "interleave_keys",
             "functional",
             "generate_sp_model", "load_sp_model",
             "sentencepiece_numericalizer", "sentencepiece_tokenizer",
             "custom_replace", "simple_space_split",
             "numericalize_tokens_from_iterator"]
  
subject: Enable importing metrics/utils/functional from torchtext.legacy.data