text: """Module defining models."""
  
  from opennmt.models.catalog import GPT2Small
  from opennmt.models.catalog import ListenAttendSpell
  from opennmt.models.catalog import LstmCnnCrfTagger
  from opennmt.models.catalog import LuongAttention
  from opennmt.models.catalog import TransformerBase
  from opennmt.models.catalog import TransformerBaseRelative
  from opennmt.models.catalog import TransformerBaseSharedEmbeddings
  from opennmt.models.catalog import TransformerBig
  from opennmt.models.catalog import TransformerBigRelative
  from opennmt.models.catalog import TransformerBigSharedEmbeddings
  from opennmt.models.catalog import TransformerTiny
  from opennmt.models.catalog import get_model_from_catalog
  from opennmt.models.catalog import register_model_in_catalog
  
  from opennmt.models.language_model import LanguageModel
  from opennmt.models.language_model import LanguageModelInputter
  
  from opennmt.models.model import Model
  from opennmt.models.model import SequenceGenerator
  
  from opennmt.models.sequence_classifier import ClassInputter
  from opennmt.models.sequence_classifier import SequenceClassifier
  
  from opennmt.models.sequence_tagger import SequenceTagger
  from opennmt.models.sequence_tagger import TagsInputter
  
  from opennmt.models.sequence_to_sequence import EmbeddingsSharingLevel
  from opennmt.models.sequence_to_sequence import SequenceToSequence
  from opennmt.models.sequence_to_sequence import SequenceToSequenceInputter
  
  from opennmt.models.transformer import Transformer
  