Dependency Parsing CMSC 723 / LING 723 / INST 725 M ARINE C ARPUAT - PowerPoint PPT Presentation

Nov 04, 2022 •485 likes •755 views

Dependency Parsing CMSC 723 / LING 723 / INST 725 M ARINE C ARPUAT marine@cs.umd.edu Slides credit: Joakim Nivre & Ryan McDonald T odays Agenda Formalizing dependency graphs Formalizing transition-based parsing most material

Dependency Parsing CMSC 723 / LING 723 / INST 725 M ARINE C ARPUAT marine@cs.umd.edu Slides credit: Joakim Nivre & Ryan McDonald
T oday’s Agenda • Formalizing dependency graphs • Formalizing transition-based parsing most material based on Kubler, McDonald & Nivre
Dependencies Typed: Label indicating relationship between words ● prep pobj dobj nsubj det det I saw a girl with a telescope Untyped: Only which words depend ● I saw a girl with a telescope
Data-driven dependency parsing Goal: learn a good predictor of dependency graphs Input: x Output: dependency graph/tree G Can be framed as a structured prediction task - very large output space - with interdependent labels
INT NTUITIO TION: N: SHI HIFT-RED REDUCE UCE PAR ARSE SER + C + CLASS ASSIFIER IFIER
Shift-Reduce ● Process words one-by-one left-to-right ● Two data structures ● Queue of unprocessed words ● Stack of partially processed words ● At each point choose one action ● shift: move one word from queue to stack ● reduce left: top word on stack is head of second word ● reduce right: second word on stack is head of top word ● Learn how to choose each action with a classifier
Shift Reduce Example Stack Queue Stack Queue I saw a girl saw a girl shift I I saw a girl r left shift saw girl I saw a girl shift I a r left r right saw a girl saw I I girl shift saw a girl a I
Classification for Shift-Reduce Given a state: ● Stack Queue saw a girl I Which action do we choose? ● ? r left ? r right ? shift saw a girl a girl saw girl saw a I I I Correct actions → correct tree ●
FOR ORMA MALIZ IZING ING DE DEPE PENDENC NDENCY Y REPRE PRESENT SENTATIO TIONS NS
Dependency Graphs
Dependency Graph Notation
Properties of Dependency Trees
Non-Projectivity • Most theoretical frameworks do not assume projectivity • Non-projective structures are needed to represent – Long-distance dependencies – Free word order
TR TRAN ANSITIO ITION-BASED BASED DE DEPE PENDENC NDENCY Y PAR ARSER SER
Dependency relations: Formal representation
Transition-based parsing
Transition-based parsing
Deterministic parsing with an oracle
Stack-based transition system
Transitions & Preconditions
Let’s try it out…
A few steps illustrated…
A few steps illustrated…
Answer: Full sequence of transitions 1. Shift: economy1 9. Shift: on6 2. Left-Arc: news2 -> economy1 10. Shift: financial7 3. Shift: news2 11. Left-Arc: markets8->financial7 4. Left-arc: had3->news2 12. Right-Arc: on6->markets8 5. Shift: had3 13. Right-Arc: on6->effect5 6. Shift: little4 14. Right-Arc: had3-> effect5 7. Left-arc: effect5->little4 15. Right-Arc: root->add3 8. Shift: effects5 16. Left-arc: period->root 17. Shift
Theoretical Results • Time & Space Complexity - O(n), where n = input sentence length! - Assuming oracle & transition functions can be computed in constant time

Recommend

Statistical Parsing Dependency parsing ar ltekin University of Tbingen Seminar fr

Statistical Parsing Dependency parsing ar ltekin University of Tbingen Seminar fr Sprachwissenschaft November 2016 Recap/background Dependency grammar Dependency parsing Evaluation Summary Ingredients of a parser

1.44k views • 89 slides

Dependency Parsing & Feature-based Parsing Ling571 Deep Processing Techniques for NLP

Dependency Parsing & Feature-based Parsing Ling571 Deep Processing Techniques for NLP February 2, 2015 Roadmap Dependency parsing Graph-based dependency parsing Maximum spanning tree CLE Algorithm Learning

899 views • 87 slides

Dependency Parsing CMSC 723 / LING 723 / INST 725 Marine Carpuat Fig credits: Joakim Nivre, Dan

Dependency Parsing CMSC 723 / LING 723 / INST 725 Marine Carpuat Fig credits: Joakim Nivre, Dan Jurafsky & James Martin Dependency Parsing Formalizing dependency trees Transition-based dependency parsing Shift-reduce parsing

676 views • 24 slides

Dependency Parsing 2 CMSC 723 / LING 723 / INST 725 Marine Carpuat Fig credits: Joakim Nivre,

Dependency Parsing 2 CMSC 723 / LING 723 / INST 725 Marine Carpuat Fig credits: Joakim Nivre, Dan Jurafsky & James Martin Dependency Parsing Formalizing dependency trees Transition-based dependency parsing Shift-reduce parsing

1.02k views • 52 slides

Natural Language Processing Other Syntactic Models Parsing IV Dan Klein UC Berkeley Dependency

Natural Language Processing Other Syntactic Models Parsing IV Dan Klein UC Berkeley Dependency Parsing Dependency Parsing Pure dependency parsing is only cubic [Eisner 99] Lexicalized parsers can be seen as producing dependency trees

314 views • 5 slides

Last class Dependency parsing and logistic regression Dependency parsing: a fully lexicalized

Last class Dependency parsing and logistic regression Dependency parsing: a fully lexicalized formalism; tree edges connect words in the Shay Cohen sentence based on head-dependent relationships. (based on slides by Sharon Goldwater) a

359 views • 11 slides

Robust Incremental Neural Semantic Graph Parsing Jan Buys and Phil Blunsom Dependency Parsing vs

Robust Incremental Neural Semantic Graph Parsing Jan Buys and Phil Blunsom Dependency Parsing vs Semantic Parsing Dependency parsing models the syntactic structure between words in a sentence. Dependency Parsing vs Semantic Parsing

637 views • 31 slides

Dependency Parsing II CMSC 470 Marine Carpuat Graph-based Dependency Parsing Slides credit:

Dependency Parsing II CMSC 470 Marine Carpuat Graph-based Dependency Parsing Slides credit: Joakim Nivre Directed Spanning Trees Dependency Parsing as Finding the Maximum Spanning Tree Views parsing as finding the best directed spanning

981 views • 61 slides

Dependency Grammars and Parsing CMSC 473/673 UMBC Outline Review: PCFGs and CKY Dependency

Dependency Grammars and Parsing CMSC 473/673 UMBC Outline Review: PCFGs and CKY Dependency Grammars Dependency Parsing (Shift-reduce) From syntax to semantics Probabilistic Context Free Grammar 1.0 S NP VP 1.0 PP P NP .4 NP Det

862 views • 75 slides

Algorithms for NLP CS 11-711 Fall 2020 Lecture 14: Graph-based dependency parsing Emma

Algorithms for NLP CS 11-711 Fall 2020 Lecture 14: Graph-based dependency parsing Emma Strubell Announcements No recitation on Friday (Tartan Community Day). 2 Dependency parsing 3 Dependency parsing Input buffer Transition-based

1.15k views • 77 slides

Thoughts on Learner Data and Motivation Learner Language Dependency Parsing and Dependency

Thoughts on Learner Data and Dependency Parsing Niels Ott, Ramon Ziai, Julia Krivanek, Detmar Meurers Introduction and Thoughts on Learner Data and Motivation Learner Language Dependency Parsing and Dependency Annotation Approximated

812 views • 53 slides

Marina Valeeva Outline 2 1. Introduction What is Dependency Parsing? What is a

GRAPH-BASED DEPENDENCY PARSING Marina Valeeva Outline 2 1. Introduction What is Dependency Parsing? What is a Dependency Tree? Projectivity vs. Non-Projectivity 2. Graph-Based Dependency Parsing 3. Models Edge Based Factorization

572 views • 40 slides

Statistical Dependency Parsing in Korean: From Corpus Generation To Automatic Parsing Workshop on

Statistical Dependency Parsing in Korean: From Corpus Generation To Automatic Parsing Workshop on Statistical Parsing of Morphologically-Rich Languages 12th International Conference on Parsing Technologies Jinho D. Choi & Martha Palmer

199 views • 19 slides

Graph-based Dependency Parsing (Chu-Liu-Edmonds algorithm) Sam Thomson (with thanks to Swabha

Graph-based Dependency Parsing (Chu-Liu-Edmonds algorithm) Sam Thomson (with thanks to Swabha Swayamdipta) University of Washington, CSE 490u February 22, 2017 Outline Dependency trees Three main approaches to parsing

648 views • 54 slides

Lecture 19: Dependency Grammars and Dependency Parsing Julia Hockenmaier juliahmr@illinois.edu

CS447: Natural Language Processing http://courses.engr.illinois.edu/cs447 Lecture 19: Dependency Grammars and Dependency Parsing Julia Hockenmaier juliahmr@illinois.edu 3324 Siebel Center Todays lecture Dependency Grammars Dependency

792 views • 54 slides

Dependency Parsing Joakim Nivre Uppsala University Department of Linguistics and Philology

Dependency Parsing Joakim Nivre Uppsala University Department of Linguistics and Philology joakim.nivre@lingfil.uu.se Dependency Parsing 1(14) 1. Dependency Trees 2. Arc-Factored Models 3. Online Learning 4. Eisners Algorithm 5.

726 views • 14 slides

Dependency Parsing CMSC 470 Marine Carpuat Dependency Grammars Syntactic structure = lexical

Dependency Parsing CMSC 470 Marine Carpuat Dependency Grammars Syntactic structure = lexical items linked by binary asymmetrical relations called dependencies Example Dependency Parse Dependencies (usually) form a tree: - Connected -

593 views • 23 slides

Dependency Parsing and Feature-based Parsing Ling 571 Deep Processing Techniques for

Dependency Parsing and Feature-based Parsing Ling 571 Deep Processing Techniques for NLP October 21, 2019 Shane Steinert-Threlkeld 1 Announcements Thanks for the feedback! HW3: mean 92 Handling ungrammaticality:

1.3k views • 70 slides

Soft Cross lingual Syntax Projection for Dependency Parsing Zhenghua Li, Min Zhang, Wenliang

Soft Cross lingual Syntax Projection for Dependency Parsing Zhenghua Li, Min Zhang, Wenliang Chen {zhli13, minzhang, wlchen}@suda.edu.cn Soochow University, China Dependency parsing A bilingual example pmod root obj obj det subj

437 views • 41 slides

Advanced Dependency Parsing Joakim Nivre Uppsala University Linguistics and Philology Based on

Advanced Dependency Parsing Joakim Nivre Uppsala University Linguistics and Philology Based on tutorials with Ryan McDonald Advanced Dependency Parsing 1(36) Introduction Plan for the Lecture 1. Graph-based vs. transition-based dependency

1.61k views • 109 slides

A Fast and Accurate Dependency Parser using Neural Networks Danqi Chen & Christopher D.

A Fast and Accurate Dependency Parser using Neural Networks Danqi Chen & Christopher D. Manning Qiming Chen qc2195 Apr. 8. 2015 Dependency Parsing Parsing: He has good control . Dependency Parsing Parsing: He has good control .

743 views • 35 slides

NLP Programming Tutorial 12 - Dependency Parsing Graham Neubig Nara Institute of Science and

NLP Programming Tutorial 12 Dependency Parsing NLP Programming Tutorial 12 - Dependency Parsing Graham Neubig Nara Institute of Science and Technology (NAIST) 1 NLP Programming Tutorial 12 Dependency Parsing Interpreting Language is

244 views • 23 slides

Dependency parsing and logistic regression Shay Cohen (based on slides by Sharon Goldwater) 21

Dependency parsing and logistic regression Shay Cohen (based on slides by Sharon Goldwater) 21 October 2019 Last class Dependency parsing: a fully lexicalized formalism; tree edges connect words in the sentence based on head-dependent

764 views • 43 slides

Dependency Parsing Lecture 2 Overview Nivre's Arc-Eager / Arc-Standard Algorithm

Dependency Parsing Lecture 2 Overview Nivre's Arc-Eager / Arc-Standard Algorithm Covington's Parsing Strategy Pseudo-projective Parsing Java ML Libraries - OpenNLP MaxEnt - Mallet - Liblinear Arc-Standard Algorithm Two

1.21k views • 92 slides