Package nltk :: Package parse :: Module nonprojectivedependencyparser :: Class NaiveBayesDependencyScorer

type NaiveBayesDependencyScorer

       object --+    
                |    
DependencyScorerI --+
                    |
                   NaiveBayesDependencyScorer

A dependency scorer built around a MaxEnt classifier. In this particular class that classifier is a NaiveBayesClassifier. It uses head-word, head-tag, child-word, and child-tag features for classification.

Instance Methods

[hide private]

__init__(self)

source code

train(self, graphs)
Trains a NaiveBayesClassifier using the edges present in graphs list as positive examples, the edges not present as negative examples. source code

3 dimensional list

score(self, graph)
Converts the graph into a feature-based representation of each edge, and then assigns a score to each based on the confidence of the classifier in assigning it to the positive label.

source code

Inherited from DependencyScorerI: __cmp__, __hash__

Method Details

[hide private]

init(self)
(Constructor)

source code

Overrides: DependencyScorerI.__init__

train(self, graphs)

source code

Trains a NaiveBayesClassifier using the edges present in graphs list as positive examples, the edges not present as negative examples. Uses a feature vector of head-word, head-tag, child-word, and child-tag.

Parameters:

graphs (A list of DependencyGraph) - A list of dependency graphs to train the scorer.

Overrides: DependencyScorerI.train

score(self, graph)

source code

Converts the graph into a feature-based representation of each edge, and then assigns a score to each based on the confidence of the classifier in assigning it to the positive label. Scores are returned in a multidimensional list.

Parameters:

graph (DependencyGraph) - A dependency graph to score.

Returns: 3 dimensional list

Edge scores for the graph parameter.

Overrides: DependencyScorerI.score

type NaiveBayesDependencyScorer

__init__(self) (Constructor)

train(self, graphs)

score(self, graph)

init(self)
(Constructor)