nltk.tag.SequentialBackoffTagger.choose_tag¶
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SequentialBackoffTagger.
choose_tag
(tokens, index, history)[source]¶ Decide which tag should be used for the specified token, and return that tag. If this tagger is unable to determine a tag for the specified token, return None – do not consult the backoff tagger. This method should be overridden by subclasses of SequentialBackoffTagger.
Return type: str
Parameters: - tokens (list) – The list of words that are being tagged.
- index (int) – The index of the word whose tag should be returned.
- history (list(str)) – A list of the tags for all words before index.