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object --+ | api.TaggerI --+ | SequentialBackoffTagger --+ | object --+ | | | api.TaggerI --+ | | | api.FeaturesetTaggerI --+ | ClassifierBasedTagger
A sequential tagger that uses a classifier to choose the tag for each token in a sentence. The featureset input for the classifier is generated by a feature detector function:
feature_detector(tokens, index, history) -> featureset
Where tokens
is the list of unlabeled tokens in the
sentence; index
is the index of the token for which feature
detection should be performed; and history
is list of the
tags for all tokens before index
.
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_feature_detector The feature detector function, used to generate a featureset for each token: |
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_cutoff_prob Cutoff probability for tagging -- if the probability of the most likely tag is less than this, then use backoff. |
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_classifier The classifier used to choose a tag for each token. |
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Construct a new classifier-based sequential tagger.
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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
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repr(x)
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Return the feature detector that this tagger uses to generate featuresets for its classifier. The feature detector is a function with the signature: feature_detector(tokens, index, history) -> featureset See Also: classifier() |
Return the classifier that this tagger uses to choose a tag for each word in a sentence. The input for this classifier is generated using this tagger's feature detector. See Also: feature_detector() |
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_feature_detectorThe feature detector function, used to generate a featureset for each token: feature_detector(tokens, index, history) -> featureset |
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