«

nltk.parse.chart.LeafEdge

class documentation

class LeafEdge(EdgeI): (source)

Known subclasses: nltk.parse.pchart.ProbabilisticLeafEdge

Constructor: LeafEdge(leaf, index)

View In Hierarchy

An edge that records the fact that a leaf value is consistent with a word in the sentence. A leaf edge consists of:

  • An index, indicating the position of the word.
  • A leaf, specifying the word's content.

A leaf edge's left-hand side is its leaf value, and its right hand side is (). Its span is [index, index+1], and its dot position is 0.

Method __init__ Construct a new LeafEdge.
Method __repr__ Undocumented
Method __str__ Undocumented
Method dot Return this edge's dot position, which indicates how much of the hypothesized structure is consistent with the sentence. In particular, self.rhs[:dot] is consistent with tokens[self.start():self.end()]...
Method end Return the end index of this edge's span.
Method is_complete Return True if this edge's structure is fully consistent with the text.
Method is_incomplete Return True if this edge's structure is partially consistent with the text.
Method length Return the length of this edge's span.
Method lhs Return this edge's left-hand side, which specifies what kind of structure is hypothesized by this edge.
Method nextsym Return the element of this edge's right-hand side that immediately follows its dot.
Method rhs Return this edge's right-hand side, which specifies the content of the structure hypothesized by this edge.
Method span Return a tuple (s, e), where tokens[s:e] is the portion of the sentence that is consistent with this edge's structure.
Method start Return the start index of this edge's span.
Instance Variable _comparison_key Undocumented
Instance Variable _index Undocumented
Instance Variable _leaf Undocumented

Inherited from EdgeI:

Method __eq__ Undocumented
Method __hash__ Undocumented
Method __lt__ Undocumented
Method __ne__ Undocumented
Instance Variable _hash Undocumented
def __init__(self, leaf, index): (source)
overrides nltk.parse.chart.EdgeI.__init__

Construct a new LeafEdge.

Parameters
leafThe new edge's leaf value, specifying the word that is recorded by this edge.
indexThe new edge's index, specifying the position of the word that is recorded by this edge.
def __repr__(self): (source)

Undocumented

def __str__(self): (source)

Undocumented

def dot(self): (source)
overrides nltk.parse.chart.EdgeI.dot

Return this edge's dot position, which indicates how much of the hypothesized structure is consistent with the sentence. In particular, self.rhs[:dot] is consistent with tokens[self.start():self.end()].

Returns
intUndocumented
def end(self): (source)
overrides nltk.parse.chart.EdgeI.end

Return the end index of this edge's span.

Returns
intUndocumented
def is_complete(self): (source)
overrides nltk.parse.chart.EdgeI.is_complete

Return True if this edge's structure is fully consistent with the text.

Returns
boolUndocumented
def is_incomplete(self): (source)
overrides nltk.parse.chart.EdgeI.is_incomplete

Return True if this edge's structure is partially consistent with the text.

Returns
boolUndocumented
def length(self): (source)
overrides nltk.parse.chart.EdgeI.length

Return the length of this edge's span.

Returns
intUndocumented
def lhs(self): (source)
overrides nltk.parse.chart.EdgeI.lhs

Return this edge's left-hand side, which specifies what kind of structure is hypothesized by this edge.

See Also
TreeEdge and LeafEdge for a description of the left-hand side values for each edge type.
def nextsym(self): (source)
overrides nltk.parse.chart.EdgeI.nextsym

Return the element of this edge's right-hand side that immediately follows its dot.

Returns
Nonterminal or terminal or NoneUndocumented
def rhs(self): (source)
overrides nltk.parse.chart.EdgeI.rhs

Return this edge's right-hand side, which specifies the content of the structure hypothesized by this edge.

See Also
TreeEdge and LeafEdge for a description of the right-hand side values for each edge type.
def span(self): (source)
overrides nltk.parse.chart.EdgeI.span

Return a tuple (s, e), where tokens[s:e] is the portion of the sentence that is consistent with this edge's structure.

Returns
tuple(int, int)Undocumented
def start(self): (source)
overrides nltk.parse.chart.EdgeI.start

Return the start index of this edge's span.

Returns
intUndocumented
_comparison_key = (source)

Undocumented

_index = (source)

Undocumented

_leaf = (source)

Undocumented