Unknown Word

An Unknown Word is a Linguistic Unit or Token which meaning is unknown during training.

• AKA: UNK Token, Unseen Word.
• Example(s):
  • an OOV Word.
  • …
• Counter-Example(s):
  • a Rare Word,
  • an In-Vocabulary Word.
• See: Word Embedding, Subword Unit, Vocabulary Word, Lexicon Word, Abbreviated Word, Lexical Normalization Task.

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