Toward Unified Graphical Models of Information Extraction and Data Mining Andrew McCallum Computer...

Toward Unified Graphical Models ofInformation Extraction and Data Mining

Andrew McCallum

Computer Science Department

University of Massachusetts Amherst

Joint work with

Charles Sutton, Aron Culotta, Ben Wellner, Khashayar Rohanimanesh,

Wei Li, Andres Corrada, Xuerui Wang

Mine actionable knowledgefrom unstructured text.

Extracting Job Openings from the Web

foodscience.com-Job2

JobTitle: Ice Cream Guru

Employer: foodscience.com

JobCategory: Travel/Hospitality

JobFunction: Food Services

JobLocation: Upper Midwest

Contact Phone: 800-488-2611

DateExtracted: January 8, 2001

Source: www.foodscience.com/jobs_midwest.html

OtherCompanyJobs: foodscience.com-Job1

IE fromChinese Documents regarding Weather

Department of Terrestrial System, Chinese Academy of Sciences

200k+ documentsseveral millennia old

- Qing Dynasty Archives- memos- newspaper articles- diaries

IE from Research Papers[McCallum et al ‘99]

IE from Research Papers

Mining Research Papers

QuickTime™ and aTIFF (LZW) decompressor

are needed to see this picture.

[Giles et al]

[Rosen-Zvi, Griffiths, Steyvers, Smyth, 2004]

What is “Information Extraction”

Information Extraction = segmentation + classification + clustering + association

As a familyof techniques:

October 14, 2002, 4:00 a.m. PT

For years, Microsoft Corporation CEO Bill Gates railed against the economic philosophy of open-source software with Orwellian fervor, denouncing its communal licensing as a "cancer" that stifled technological innovation.

Today, Microsoft claims to "love" the open-source concept, by which software code is made public to encourage improvement and development by outside programmers. Gates himself says Microsoft will gladly disclose its crown jewels--the coveted code behind the Windows operating system--to select customers.

"We can be open source. We love the concept of shared source," said Bill Veghte, a Microsoft VP. "That's a super-important shift for us in terms of code access.“

Richard Stallman, founder of the Free Software Foundation, countered saying…

Microsoft CorporationCEOBill GatesMicrosoftGatesMicrosoftBill VeghteMicrosoftVPRichard StallmanfounderFree Software Foundation

Information Extraction = segmentation + classification + association + clustering

October 14, 2002, 4:00 a.m. PT

TITLE ORGANIZATION

Bill Gates

Microsoft

Bill Veghte

Microsoft

Richard Stallman

founder

Free Soft..

Larger Context

SegmentClassifyAssociateCluster

Filter

Prediction Outlier detection Decision support

Documentcollection

Database

Discover patterns - entity types - links / relations - events

DataMining

Spider

Actionableknowledge

Outline

• Examples of IE and Data Mining.

• Brief review of Conditional Random Fields

• Joint inference: Motivation and examples

– Joint Labeling of Cascaded Sequences (Belief Propagation)

– Joint Labeling of Distant Entities (BP by Tree Reparameterization)

– Joint Co-reference Resolution (Graph Partitioning)

– Joint Segmentation and Co-ref (Iterated Conditional Samples)

• Piecewise Training for large multi-component models

• Two example projects

– Email, contact management, and Social Network Analysis

– Research Paper search and analysis

Hidden Markov Models

St - 1

Finite state model Graphical model

Parameters: for all states S={s1,s2,…} Start state probabilities: P(st ) Transition probabilities: P(st|st-1 ) Observation (emission) probabilities: P(ot|st )Training: Maximize probability of training observations (w/ prior)

−∝||

11 )|()|(),(

ttttt soPssPosP

HMMs are the standard sequence modeling tool in genomics, music, speech, NLP, …

...transitions

observations

o1 o2 o3 o4 o5 o6 o7 o8

Generates:

State sequenceObservation sequence

Usually a multinomial over atomic, fixed alphabet

IE with Hidden Markov Models

Yesterday Rich Caruana spoke this example sentence.

Person name: Rich Caruana

Given a sequence of observations:

and a trained HMM:

Find the most likely state sequence: (Viterbi)

Any words said to be generated by the designated “person name”state extract as a person name:

person name

location name

background

(Linear Chain) Conditional Random Fields

yt - 1

Finite state model Graphical model

Undirected graphical model,

trained to maximize conditional probability of outputs given inputs

FSM states

observations

said Veght a Microsoft VP …

p(y | x) =1

Z(x)Φy (y t ,y t−1)Φxy (x t ,y t )

Φ(⋅) = exp λ k fk (⋅)k

∑ ⎛

⎝ ⎜

⎠ ⎟where

OTHER PERSON OTHER ORG TITLE …

output seq

input seq

Asian word segmentation [COLING’04], [ACL’04]IE from Research papers [HTL’04]Object classification in images [CVPR ‘04]

Fast-growing, wide-spread interest, many positive experimental results.

Noun phrase, Named entity [HLT’03], [CoNLL’03]Protein structure prediction [ICML’04]IE from Bioinformatics text [Bioinformatics ‘04],…

[Lafferty, McCallum, Pereira 2001]

Table Extraction from Government ReportsCash receipts from marketings of milk during 1995 at $19.9 billion dollars, was slightly below 1994. Producer returns averaged $12.93 per hundredweight, $0.19 per hundredweight below 1994. Marketings totaled 154 billion pounds, 1 percent above 1994. Marketings include whole milk sold to plants and dealers as well as milk sold directly to consumers. An estimated 1.56 billion pounds of milk were used on farms where produced, 8 percent less than 1994. Calves were fed 78 percent of this milk with the remainder consumed in producer households. Milk Cows and Production of Milk and Milkfat: United States, 1993-95 -------------------------------------------------------------------------------- : : Production of Milk and Milkfat 2/ : Number :------------------------------------------------------- Year : of : Per Milk Cow : Percentage : Total :Milk Cows 1/:-------------------: of Fat in All :------------------ : : Milk : Milkfat : Milk Produced : Milk : Milkfat -------------------------------------------------------------------------------- : 1,000 Head --- Pounds --- Percent Million Pounds : 1993 : 9,589 15,704 575 3.66 150,582 5,514.4 1994 : 9,500 16,175 592 3.66 153,664 5,623.7 1995 : 9,461 16,451 602 3.66 155,644 5,694.3 --------------------------------------------------------------------------------1/ Average number during year, excluding heifers not yet fresh. 2/ Excludes milk sucked by calves.

Table Extraction from Government Reports

Cash receipts from marketings of milk during 1995 at $19.9 billion dollars, was

slightly below 1994. Producer returns averaged $12.93 per hundredweight,

$0.19 per hundredweight below 1994. Marketings totaled 154 billion pounds,

1 percent above 1994. Marketings include whole milk sold to plants and dealers

as well as milk sold directly to consumers.

An estimated 1.56 billion pounds of milk were used on farms where produced,

8 percent less than 1994. Calves were fed 78 percent of this milk with the

remainder consumed in producer households.

Milk Cows and Production of Milk and Milkfat:

United States, 1993-95

--------------------------------------------------------------------------------

: : Production of Milk and Milkfat 2/

: Number :-------------------------------------------------------

Year : of : Per Milk Cow : Percentage : Total

:Milk Cows 1/:-------------------: of Fat in All :------------------

: : Milk : Milkfat : Milk Produced : Milk : Milkfat

--------------------------------------------------------------------------------

: 1,000 Head --- Pounds --- Percent Million Pounds

1993 : 9,589 15,704 575 3.66 150,582 5,514.4

1994 : 9,500 16,175 592 3.66 153,664 5,623.7

1995 : 9,461 16,451 602 3.66 155,644 5,694.3

--------------------------------------------------------------------------------

1/ Average number during year, excluding heifers not yet fresh.

2/ Excludes milk sucked by calves.

CRFLabels:• Non-Table• Table Title• Table Header• Table Data Row• Table Section Data Row• Table Footnote• ... (12 in all)

[Pinto, McCallum, Wei, Croft, 2003 SIGIR]

Features:• Percentage of digit chars• Percentage of alpha chars• Indented• Contains 5+ consecutive spaces• Whitespace in this line aligns with prev.• ...• Conjunctions of all previous features,

time offset: {0,0}, {-1,0}, {0,1}, {1,2}.

100+ documents from www.fedstats.gov

Table Extraction Experimental Results

Line labels,percent correct

Table segments,F1

95 % 92 %

65 % 64 %

85 % -

StatelessMaxEnt

[Pinto, McCallum, Wei, Croft, 2003 SIGIR]

IE from Research Papers[McCallum et al ‘99]

IE from Research Papers

Field-level F1

Hidden Markov Models (HMMs) 75.6[Seymore, McCallum, Rosenfeld, 1999]

Support Vector Machines (SVMs) 89.7[Han, Giles, et al, 2003]

Conditional Random Fields (CRFs) 93.9[Peng, McCallum, 2004]

error40%

Named Entity Recognition

CRICKET - MILLNS SIGNS FOR BOLAND

CAPE TOWN 1996-08-22

South African provincial side Boland said on Thursday they had signed Leicestershire fast bowler David Millns on a one year contract. Millns, who toured Australia with England A in 1992, replaces former England all-rounder Phillip DeFreitas as Boland's overseas professional.

Labels: Examples:

PER Yayuk BasukiInnocent Butare

ORG 3MKDPCleveland

LOC ClevelandNirmal HridayThe Oval

MISC JavaBasque1,000 Lakes Rally

Named Entity Extraction Results

Method F1

HMMs BBN's Identifinder 73%

CRFs w/out Feature Induction 83%

CRFs with Feature Induction 90%based on LikelihoodGain

[McCallum & Li, 2003, CoNLL]

Outline

Larger Context

Filter

Documentcollection

Database

DataMining

Spider

Actionableknowledge

Problem:

Combined in serial juxtaposition,IE and DM are unaware of each others’ weaknesses and opportunities.

1) DM begins from a populated DB, unaware of where the data came from, or its inherent uncertainties.

2) IE is unaware of emerging patterns and regularities in the DB.

The accuracy of both suffers, and significant mining of complex text sources is beyond reach.

Documentcollection

Database

KnowledgeDiscovery

Actionableknowledge

Filter

Documentcollection

Database

DataMining

Spider

Actionableknowledge

Uncertainty Info

Emerging Patterns

Solution:

Filter

Documentcollection

ProbabilisticModel

DataMining

Spider

Actionableknowledge

Solution:

Conditional Random Fields [Lafferty, McCallum, Pereira]

Conditional PRMs [Koller…], [Jensen…], [Geetor…], [Domingos…]

Discriminatively-trained undirected graphical models

Complex Inference and LearningJust what we researchers like to sink our teeth into!

Unified Model

Larger-scale Joint Inference for IE

• What model structures will capture salient dependencies?

• Will joint inference improve accuracy?

• How do to inference in these large graphical models?

• How to efficiently train these models,which are built from multiple large components?

1. Jointly labeling cascaded sequencesFactorial CRFs

Part-of-speech

Noun-phrase boundaries

Named-entity tag

English words

[Sutton, Khashayar, McCallum, ICML 2004]

Part-of-speech

Named-entity tag

English words

Part-of-speech

Named-entity tag

English words

But errors cascade--must be perfect at every stage to do well.

Part-of-speech

Named-entity tag

English words

Joint prediction of part-of-speech and noun-phrase in newswire,matching accuracy with only 50% of the training data.

Inference:Tree reparameterization BP

[Wainwright et al, 2002]

2. Jointly labeling distant mentionsSkip-chain CRFs

Senator Joe Green said today … . Green ran for …

[Sutton, McCallum, SRL 2004]

Dependency among similar, distant mentions ignored.

2. Jointly labeling distant mentionsSkip-chain CRFs

Senator Joe Green said today … . Green ran for …

[Sutton, McCallum, SRL 2004]

14% reduction in error on most repeated field in email seminar announcements.

Inference:Tree reparameterization BP

[Wainwright et al, 2002]

3. Joint co-reference among all pairsAffinity Matrix CRF

. . . Mr Powell . . .

. . . Powell . . .

. . . she . . .

[McCallum, Wellner, IJCAI WS 2003, NIPS 2004]

~25% reduction in error on co-reference ofproper nouns in newswire.

Inference:Correlational clusteringgraph partitioning

[Bansal, Blum, Chawla, 2002]

“Entity resolution”“Object correspondence”

Coreference Resolution

AKA "record linkage", "database record deduplication", "entity resolution", "object correspondence", "identity uncertainty"

Output

News article, with named-entity "mentions" tagged

Number of entities, N = 3

#1 Secretary of State Colin Powell he Mr. Powell Powell

#2 Condoleezza Rice she Rice

#3 President Bush Bush

Today Secretary of State Colin Powell met with . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . he . . . . . .. . . . . . . . . . . . . Condoleezza Rice . . . . .. . . . Mr Powell . . . . . . . . . .she . . . . . . . . . . . . . . . . . . . . . Powell . . . . . . . . . . . .. . . President Bush . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . Rice . . . . . . . . . . . . . . . . Bush . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . .

Inside the Traditional Solution

Mention (3) Mention (4)

. . . Mr Powell . . . . . . Powell . . .

N Two words in common 29Y One word in common 13Y "Normalized" mentions are string identical 39Y Capitalized word in common 17Y > 50% character tri-gram overlap 19N < 25% character tri-gram overlap -34Y In same sentence 9Y Within two sentences 8N Further than 3 sentences apart -1Y "Hobbs Distance" < 3 11N Number of entities in between two mentions = 0 12N Number of entities in between two mentions > 4 -3Y Font matches 1Y Default -19

OVERALL SCORE = 98 > threshold=0

Pair-wise Affinity Metric

The Problem

. . . Mr Powell . . .

. . . Powell . . .

. . . she . . .

affinity = 98

affinity = 11

affinity = 104

Pair-wise mergingdecisions are beingmade independentlyfrom each otherY

Affinity measures are noisy and imperfect.

They should be madein relational dependencewith each other.

A Markov Random Field for Co-reference

. . . Mr Powell . . .

. . . Powell . . .

. . . she . . .

[McCallum & Wellner, 2003, ICML](MRF)

Make pair-wise mergingdecisions in dependent relation to each other by- calculating a joint prob.- including all edge weights- adding dependence on consistent triangles.

P(v y |

v x ) =

exp λ l f l (x i, x j , y ij ) + λ ' f '(y ij , y jk,y ik )i, j,k

∑i, j

∑ ⎛

⎝ ⎜ ⎜

⎠ ⎟ ⎟

. . . Mr Powell . . .

. . . Powell . . .

. . . she . . .

[McCallum & Wellner, 2003](MRF)

Make pair-wise mergingdecisions in dependent relation to each other by- calculating a joint prob.- including all edge weights- adding dependence on consistent triangles.

11 ∞−

P(v y |

v x ) =

∑i, j

∑ ⎛

⎝ ⎜ ⎜

⎠ ⎟ ⎟

. . . Mr Powell . . .

. . . Powell . . .

. . . she . . .

[McCallum & Wellner, 2003]

P(v y |

v x ) =

∑i, j

∑ ⎛

⎝ ⎜ ⎜

⎠ ⎟ ⎟

. . . Mr Powell . . .

. . . Powell . . .

. . . she . . .

P(v y |

v x ) =

∑i, j

∑ ⎛

⎝ ⎜ ⎜

⎠ ⎟ ⎟

infinity

. . . Mr Powell . . .

. . . Powell . . .

. . . she . . .

P(v y |

v x ) =

∑i, j

∑ ⎛

⎝ ⎜ ⎜

⎠ ⎟ ⎟

Inference in these MRFs = Graph Partitioning[Boykov, Vekler, Zabih, 1999], [Kolmogorov & Zabih, 2002], [Yu, Cross, Shi, 2002]

. . . Mr Powell . . .

. . . Powell . . .

. . . she . . .

. . . Condoleezza Rice . . .

log P(v y |

v x )( )∝ λ l f l (x i,x j , y ij )

∑i, j

∑ = w ij

i, j w/inparitions

∑ − w ij

i, j acrossparitions

. . . Mr Powell . . .

. . . Powell . . .

. . . she . . . . . . Condoleezza Rice . . .

log P(v y |

v x )( )∝ λ l f l (x i,x j , y ij )

∑i, j

∑ = w ij

i, j w/inparitions

∑ − w ij

i, j acrossparitions

. . . Mr Powell . . .

. . . Powell . . .

. . . she . . . . . . Condoleezza Rice . . .

log P(v y |

v x )( )∝ λ l f l (x i, x j , y ij )

∑i, j

∑ = w ij

i, j w/inparitions

∑ + w'iji, j acrossparitions

∑ = 314

Co-reference Experimental Results

Proper noun co-reference

DARPA ACE broadcast news transcripts, 117 stories

Partition F1 Pair F1Single-link threshold 16 % 18 %Best prev match [Morton] 83 % 89 %MRFs 88 % 92 %

error=30% error=28%

DARPA MUC-6 newswire article corpus, 30 stories

Partition F1 Pair F1Single-link threshold 11% 7 %Best prev match [Morton] 70 % 76 %MRFs 74 % 80 %

error=13% error=17%

Joint Co-reference of Multiple Fields

X. LiPredicting the Stock Market

International Conference onKnowledge Discovery and Data Mining

[Culotta & McCallum 2005]

Xuerui LiPredict the Stock Market

Citations Venues

Joint Co-reference Experimental Results

CiteSeer Dataset1500 citations, 900 unique papers, 350 unique venues

Paper Venueindep joint indep joint

constraint 88.9 91.0 79.4 94.1reinforce 92.2 92.2 56.5 60.1face 88.2 93.7 80.9 82.8reason 97.4 97.0 75.6 79.5Micro Average 91.7 93.4 73.1 79.1

error=20% error=22%

[Culotta & McCallum 2005]

Joint co-reference among all pairsAffinity Matrix CRF

. . . Mr Powell . . .

. . . Powell . . .

. . . she . . .

[McCallum, Wellner, IJCAI WS 2003, NIPS 2004]

~25% reduction in error on co-reference ofproper nouns in newswire.

Inference:Correlational clusteringgraph partitioning

[Bansal, Blum, Chawla, 2002]

Databasefield values

4. Joint segmentation and co-reference

Citation attributes

Segmentation

[Wellner, McCallum, Peng, Hay, UAI 2004]Inference:Variant of Iterated Conditional Modes

Co-reference decisions

Laurel, B. Interface Agents: Metaphors with Character, in The Art of Human-Computer Interface Design, B. Laurel (ed), Addison-Wesley, 1990.

Brenda Laurel. Interface Agents: Metaphors with Character, in Laurel, The Art of Human-Computer Interface Design, 355-366, 1990.

[Besag, 1986]

World Knowledge

35% reduction in co-reference error by using segmentation uncertainty.

6-14% reduction in segmentation error by using co-reference.

Extraction from and matching of research paper citations.

see also [Marthi, Milch, Russell, 2003]

Joint IE and Coreference from Research Paper Citations

Textual citation mentions(noisy, with duplicates)

Paper database, with fields,clean, duplicates collapsed

AUTHORS TITLE VENUECowell, Dawid… Probab… SpringerMontemerlo, Thrun…FastSLAM… AAAI…Kjaerulff Approxi… Technic…

4. Joint segmentation and co-reference

Laurel, B. Interface Agents: Metaphors with Character , in

The Art of Human-Computer Interface Design , T. Smith (ed) ,

Addison-Wesley , 1990 .

Brenda Laurel . Interface Agents: Metaphors with Character , in

Smith , The Art of Human-Computr Interface Design , 355-366 , 1990 .

Citation Segmentation and Coreference

1) Segment citation fields

2) Resolve coreferent citations

3) Form canonical database record

AUTHOR = Brenda Laurel TITLE = Interface Agents: Metaphors with CharacterPAGES = 355-366BOOKTITLE = The Art of Human-Computer Interface DesignEDITOR = T. SmithPUBLISHER = Addison-WesleyYEAR = 1990

Resolving conflicts

3) Form canonical database record

AUTHOR = Brenda Laurel TITLE = Interface Agents: Metaphors with CharacterPAGES = 355-366BOOKTITLE = The Art of Human-Computer Interface DesignEDITOR = T. SmithPUBLISHER = Addison-WesleyYEAR = 1990

Perform jointly.

Observed citation

CRF Segmentation

IE + Coreference Model

J Besag 1986 On the…

AUT AUT YR TITL TITL

Observed citation

CRF Segmentation

Citation mention attributes

J Besag 1986 On the…

AUTHOR = “J Besag”YEAR = “1986”TITLE = “On the…”

J Besag 1986 On the…Smyth . 2001 Data Mining…

Smyth , P Data mining…

Structure for each citation mention

Binary coreference variablesfor each pair of mentions

Research paper entity attribute nodes

AUTHOR = “P Smyth”YEAR = “2001”TITLE = “Data Mining…”...

Such a highly connected graph makes exact inference intractable…

Parameter Estimation

Coref graph edge weightsMAP on individual edges

Separately for different regions

IE Linear-chainExact MAP

Entity attribute potentialsMAP, pseudo-likelihood

In all cases:Climb MAP gradient with

quasi-Newton method

Outline

Piecewise Training

Piecewise Training with NOTA

Experimental Results

Named entity tagging (CoNLL-2003)Training set = 15k newswire sentences9 labels

Test F1 Training time

CRF 89.87 9 hours

MEMM 88.90 1 hour

CRF-PT 5.3 hours90.50stat. sig. improvement atp = 0.001

Experimental Results 2

Part-of-speech tagging (Penn Treebank, small subset)Training set = 1154 newswire sentences45 labels

Test F1 Training time

CRF 88.1 14 hours

MEMM 88.1 2 hours

CRF-PT 2.5 hours88.8stat. sig. improvement atp = 0.001

“Parameter Independence Diagrams”

Graphical models = formalism for representing independence assumptions among variables.

Here we representindependence assumptions among parameters (in factor graph)

Piecewise Training Research Questions

• How to select the boundaries of “pieces”?• What choices of limited interaction are best?• How to sample sparse subsets of NOTA instances?

• Application to simpler models (classifiers)• Application to more complex models (parsing)

Piecewise Training in Factorial CRFsfor Transfer Learning

Emailed seminar ann’mt entities

Email English words

[Sutton, McCallum, 2005]

Too little labeled training data.

60k words training. GRAND CHALLENGES FOR MACHINE LEARNING

Jaime Carbonell School of Computer Science Carnegie Mellon University

3:30 pm 7500 Wean Hall

Machine learning has evolved from obscurity in the 1970s into a vibrant and popular discipline in artificial intelligence during the 1980s and 1990s. As a result of its success and growth, machine learning is evolving into a collection of related disciplines: inductive concept acquisition, analytic learning in problem solving (e.g. analogy, explanation-based learning), learning theory (e.g. PAC learning), genetic algorithms, connectionist learning, hybrid systems, and so on.

Newswire named entities

Newswire English words

Train on “related” task with more data.

200k words training.

CRICKET - MILLNS SIGNS FOR BOLAND

CAPE TOWN 1996-08-22

South African provincial side Boland said on Thursday they had signed Leicestershire fast bowler David Millns on a one year contract. Millns, who toured Australia with England A in 1992, replaces former England all-rounder Phillip DeFreitas as Boland's overseas professional.

Email English words

At test time, label email with newswire NEs...

Emailed seminar ann’mt entities

Email English words

…then use these labels as features for final task

Seminar Announcement entities

English words

Piecewise training of a joint model.

CRF Transfer Experimental Results

Seminar Announcements Dataset [Freitag 1998]

CRF stime etime location speaker overall

No transfer 99.1 97.3 81.0 73.7 87.8

Cascaded transfer 99.2 96.0 84.3 74.2 88.4

Joint transfer 99.1 96.0 85.3 76.3 89.2

New “best published”accuracy on commondataset

Outline

Workplace effectiveness ~ Ability to leverage network of acquaintances

But filling Contacts DB by hand is tedious, and incomplete.

QuickTime™ and aTIFF (Uncompressed) decompressor

Email Inbox Contacts DB

QuickTime™ and aTIFF (Uncompressed) decompressorare needed to see this picture.

Automatically

Managing and UnderstandingConnections of People in our Email World

System Overview

ContactInfo andPerson Name

Extraction

Person Name

Extraction

NameCoreference

HomepageRetrieval

Social NetworkAnalysis

KeywordExtraction

CRFWWW

Email QuickTime™ and aTIFF (Uncompressed) decompressorare needed to see this picture.

An ExampleTo: “Andrew McCallum” mccallum@cs.umass.edu

Subject ...

First Name:

Andrew

Middle Name:

Kachites

Last Name:

McCallum

JobTitle: Associate Professor

Company: University of Massachusetts

Street Address:

140 Governor’s Dr.

City: Amherst

State: MA

Zip: 01003

Company Phone:

(413) 545-1323

Links: Fernando Pereira, Sam Roweis,…

Key Words:

Information extraction,

social network,…

Search for new people

Summary of Results

Recall

CRF 94.50 85.73 76.33 80.76

Person Keywords

William Cohen Logic programming

Text categorization

Data integration

Rule learning

Daphne Koller Bayesian networks

Relational models

Probabilistic models

Hidden variables

Deborah McGuiness

Semantic web

Description logics

Knowledge representation

Ontologies

Tom Mitchell Machine learning

Cognitive states

Learning apprentice

Artificial intelligence

Contact info and name extraction performance (25 fields)

Example keywords extracted

1. Expert Finding: When solving some task, find friends-of-friends with relevant expertise. Avoid “stove-piping” in large org’s by automatically suggesting collaborators. Given a task, automatically suggest the right team for the job. (Hiring aid!)

2. Social Network Analysis: Understand the social structure of your organization. Suggest structural changes for improved efficiency.

From LDA to Author-Recipient-Topic(ART)

Inference and Estimation

Gibbs Sampling:- Easy to implement- Reasonably fast

Enron Email Corpus

• 250k email messages• 23k people

Date: Wed, 11 Apr 2001 06:56:00 -0700 (PDT)From: debra.perlingiere@enron.comTo: steve.hooser@enron.comSubject: Enron/TransAltaContract dated Jan 1, 2001

Please see below. Katalin Kiss of TransAlta has requested an electronic copy of our final draft? Are you OK with this? If so, the only version I have is the original draft without revisions.

Debra PerlingiereEnron North America Corp.Legal Department1400 Smith Street, EB 3885Houston, Texas 77002dperlin@enron.com

Topics, and prominent sender/receiversdiscovered by ART

Beck = “Chief Operations Officer”Dasovich = “Government Relations Executive”Shapiro = “Vice Presidence of Regulatory Affairs”Steffes = “Vice President of Government Affairs”

Comparing Role Discovery

connection strength (A,B) =

distribution overauthored topics

Traditional SNA

distribution overrecipients

distribution overauthored topics

Author-TopicART

Comparing Role Discovery Tracy Geaconne Dan McCarty

Traditional SNA Author-TopicART

Similar roles Different rolesDifferent roles

Geaconne = “Secretary”McCarty = “Vice President”

Different roles Very similarNot very similar

Geaconne = “Secretary”Hayslett = “Vice President & CTO”

Comparing Role Discovery Tracy Geaconne Rod Hayslett

Different roles Very differentVery similar

Blair = “Gas pipeline logistics”Watson = “Pipeline facilities planning”

Comparing Role Discovery Lynn Blair Kimberly Watson

McCallum Email Corpus 2004

• January - October 2004• 23k email messages• 825 people

From: kate@cs.umass.eduSubject: NIPS and ....Date: June 14, 2004 2:27:41 PM EDTTo: mccallum@cs.umass.edu

There is pertinent stuff on the first yellow folder that is completed either travel or other things, so please sign that first folder anyway. Then, here is the reminder of the things I'm still waiting for:

NIPS registration receipt.CALO registration receipt.

Thanks,Kate

McCallum Email Blockstructure

Four most prominent topicsin discussions with ____?

Two most prominent topicsin discussions with ____?

Words Problove 0.030514house 0.015402

0.013659time 0.012351great 0.011334hope 0.011043dinner 0.00959saturday 0.009154left 0.009154ll 0.009009

0.008282visit 0.008137evening 0.008137stay 0.007847bring 0.007701weekend 0.007411road 0.00712sunday 0.006829kids 0.006539flight 0.006539

Words Probtoday 0.051152tomorrow 0.045393time 0.041289ll 0.039145meeting 0.033877week 0.025484talk 0.024626meet 0.023279morning 0.022789monday 0.020767back 0.019358call 0.016418free 0.015621home 0.013967won 0.013783day 0.01311hope 0.012987leave 0.012987office 0.012742tuesday 0.012558

Topic 40

Words Prob Sender Recipient Probcode 0.060565 hough mccallum 0.067076mallet 0.042015 mccallum hough 0.041032files 0.029115 mikem mccallum 0.028501al 0.024201 culotta mccallum 0.026044file 0.023587 saunders mccallum 0.021376version 0.022113 mccallum saunders 0.019656java 0.021499 pereira mccallum 0.017813test 0.020025 casutton mccallum 0.017199problem 0.018305 mccallum ronb 0.013514run 0.015356 mccallum pereira 0.013145cvs 0.013391 hough melinda.gervasio 0.013022add 0.012776 mccallum casutton 0.013022directory 0.012408 fuchun mccallum 0.010811release 0.012285 mccallum culotta 0.009828output 0.011916 ronb mccallum 0.009705bug 0.011179 westy hough 0.009214source 0.010197 xuerui corrada 0.0086ps 0.009705 ghuang mccallum 0.008354log 0.008968 khash mccallum 0.008231created 0.0086 melinda.gervasiomccallum 0.008108

Role-Author-Recipient-Topic Models

Outline

Previous Systems

ResearchPaper

Previous Systems

ResearchPaper

Person

UniversityVenue

Groups

Expertise

More Entities and Relations

Summary

• Conditional Random Fields– Conditional probability models of structured data

• Data mining complex unstructured text suggests the need for joint inference IE + DM.

• Early examples– Factorial finite state models– Jointly labeling distant entities– Coreference analysis– Segmentation uncertainty aiding coreference

• Piecewise Training– Faster + higher accuracy

• Current projects– Email, contact management, expert-finding, SNA– Mining the scientific literature

End of Talk

Toward Unified Graphical Models of Information Extraction and Data Mining Andrew McCallum Computer...

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