Package nltk :: Package parse :: Module chart :: Class CachedTopDownExpandRule

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Class CachedTopDownExpandRule

       object --+        
                |        
AbstractChartRule --+    
                    |    
    TopDownExpandRule --+
                        |
                       CachedTopDownExpandRule

Known Subclasses:

PredictorRule

A cached version of TopDownExpandRule. After the first time this rule is applied to an edge with a given end and next, it will not generate any more edges for edges with that end and next.

If chart or grammar are changed, then the cache is flushed.

Instance Methods

__init__(self)
x.__init__(...) initializes x; see x.__class__.__doc__ for signature

source code

apply_iter(self, chart, grammar, edge)

source code

__str__(self)
str(x)

source code

Inherited from AbstractChartRule: apply, apply_everywhere, apply_everywhere_iter

Inherited from object: __delattr__, __getattribute__, __hash__, __new__, __reduce__, __reduce_ex__, __repr__, __setattr__

Class Variables

Inherited from TopDownExpandRule: NUM_EDGES

Properties

Inherited from object: __class__

Method Details

init(self)
(Constructor)

x.__init__(...) initializes x; see x.__class__.__doc__ for signature

Overrides: object.__init__: (inherited documentation)

apply_iter(self, chart, grammar, edge)

Overrides: TopDownExpandRule.apply_iter

str(self)
(Informal representation operator)

str(x)

Overrides: AbstractChartRule.__str__