Character tokenization addresses the limitations of word tokenization by breaking down text into individual characters. For instance, a sentence like “What is tokenization?” would be tokenized into individual characters: ‘w’, ‘h’, ‘a’, ‘t’, ‘i’, ‘s’, ‘t’, ‘o’, ‘k’, ‘e’, ‘n’, ‘i’, ‘s’, ‘a’, ‘t’, ‘i’, ‘o’, ‘n’.
This method retains information about OOV words but introduces complications due to the increased number of tokens and the need to understand character relationships within words. Additionally, character tokenization adds an extra step: understanding the relationship between characters and the meaning of words, which moves away from the core purpose of NLP—interpreting meaning.
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