Package nltk :: Package parse :: Module featurechart

Module featurechart

Extension of chart parsing implementation to handle grammars with feature structures as nodes.

Classes

FeatureTreeEdge
A specialized tree edge that allows shared variable bindings between nonterminals on the left-hand side and right-hand side.

FeatureChart
A Chart for feature grammars.

FeatureFundamentalRule
A specialized version of the fundamental rule that operates on nonterminals whose symbols are FeatStructNonterminals.

FeatureSingleEdgeFundamentalRule
A specialized version of the completer / single edge fundamental rule that operates on nonterminals whose symbols are FeatStructNonterminals.

FeatureTopDownInitRule

FeatureTopDownPredictRule
A specialized version of the (cached) top down predict rule that operates on nonterminals whose symbols are FeatStructNonterminals.

FeatureBottomUpPredictRule

FeatureBottomUpPredictCombineRule

FeatureEmptyPredictRule

FeatureChartParser

FeatureTopDownChartParser

FeatureBottomUpChartParser

FeatureBottomUpLeftCornerChartParser

InstantiateVarsChart
A specialized chart that 'instantiates' variables whose names start with '@', by replacing them with unique new variables.

Functions

[hide private]

demo_grammar()

source code

demo(should_print_times=True, should_print_grammar=True, should_print_trees=True, should_print_sentence=True, trace=1, parser=<class 'nltk.parse.featurechart.FeatureChartParser'>, sent='I saw John with a dog with my cookie') source code

run_profile()

source code

Variables

[hide private]

TD_FEATURE_STRATEGY = [LeafInitRule(), FeatureTopDownInitRule(...

BU_FEATURE_STRATEGY = [LeafInitRule(), FeatureEmptyPredictRule...

BU_LC_FEATURE_STRATEGY = [LeafInitRule(), FeatureEmptyPredictR...

Variables Details

[hide private]

TD_FEATURE_STRATEGY

Value:

[LeafInitRule(), FeatureTopDownInitRule(), FeatureTopDownPredictRule()
, FeatureSingleEdgeFundamentalRule()]

BU_FEATURE_STRATEGY

Value:

[LeafInitRule(), FeatureEmptyPredictRule(), FeatureBottomUpPredictRule
(), FeatureSingleEdgeFundamentalRule()]

BU_LC_FEATURE_STRATEGY

Value:

[LeafInitRule(), FeatureEmptyPredictRule(), FeatureBottomUpPredictComb
ineRule(), FeatureSingleEdgeFundamentalRule()]