System and method for natural language generation
View Patent ↗A system, method and computer-readable medium for generating natural language utilizes a stochastic process to choose a derivation tree according to a predetermined grammar, such as tree-adjoined grammar (TAG). A word lattice is created from a single semi-specified derivation tree and the proper path (i.e., desired output string) is selected from the lattice using a least cost, or other appropriate algorithms.
1. A method for generating natural language output, the method comprising:
executing instructions in a computing device to create a semi-specified derivation tree by selecting tree-adjoining grammar trees for each node in an input dependency syntax tree;
executing instructions in a computing device to create a lattice of all possible linearizations of the selected tree-adjoining grammar trees; and
executing instructions in a computing device to generate natural language output by selecting a most likely traversal path through the created lattice.
2. The method of claim 1 , wherein the step of selecting tree-adjoining grammar trees utilizes a tree model database.
3. The method of claim 1 , wherein the lattice is created using a reference grammar.
4. The method of claim 3 , wherein the reference grammar is from a reference grammar database comprising an XTAG grammar database.
5. The method of claim 1 , wherein:
the step of selecting tree-adjoining grammar trees is performed by a tree choosing module;
the step of creating a lattice is performed by an unraveling module; and
the step of selecting a most likely traversal path is performed by a linear precedence chooser module.
6. The method of claim 1 , wherein selecting a most likely traversal path utilizes a Viterbi algorithm.
7. A tangible computer-readable medium storing instructions for controlling a computing device to generate natural language output, the instructions comprising:
creating a semi-specified derivation tree by selecting tree-adjoining grammar trees for each node in an input dependency syntax tree;
creating a lattice of all possible linearizations of the trees using a reference grammar; and
generating natural language output by selecting a most likely traversal path through the created lattice.
8. The tangible computer-readable medium of claim 7 , wherein the step of selecting tree-adjoining grammar trees utilizes a tree model database.
9. The tangible computer-readable medium of claim 7 , wherein the lattice is created using a reference grammar.
10. The tangible computer-readable medium of claim 9 , wherein the reference grammar is from a reference grammar database comprising an XTAG grammar database.
11. The tangible computer-readable medium of claim 7 , wherein:
the step of selecting tree-adjoining grammar trees is performed by a tree choosing module;
the step of creating a lattice is performed by an unraveling module; and
the step of selecting a most likely traversal path is performed by a linear precedence chooser module.
12. The tangible computer-readable medium of claim 7 , wherein selecting a most likely traversal path utilizes a Viterbi algorithm.
13. A computing device for generating a natural language output, the computing device comprising:
the processor;
a module configured to control the computer device to create a semi-specified derivation tree by selecting tree-adjoining grammar trees for each node in an input dependency syntax tree;
a module configured to control the computing device to create a lattice of all possible linearizations of the selected tree-adjoining grammar trees; and
a module configured to control the computing device to generate natural language output by selecting a most likely traversal path through the created lattice.
14. The computing device of claim 13 , wherein the module configured to control the computing device to select tree-adjoining grammar trees utilizes a tree model database.
15. The computing device of claim 13 , wherein the lattice is created using a reference grammar.
16. The computing device of claim 15 , wherein the reference grammar is from a reference grammar database comprising an XTAG grammar database.
17. The computing device of claim 13 , wherein:
the module configured to control the computing device to select tree-adjoining grammar trees is a tree choosing module;
the module configured to control the computing device to create a lattice is an unraveling module; and
the module configured to control the computing device to select a most likely traversal path is a linear precedence chooser module.
18. The computing device of claim 13 , wherein the module configured to control the computing device to select a most likely traversal path utilizes a Viterbi algorithm.