[]O8ADC^ I1`aLcbLdCfe …dmr.cs.umn.edu/Papers/P1996_15.pdf · Selection of training data sample...

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Selection oftraining data

sample

Selection of mostinteresting models

Training datafor knowledgemodel learning

Models learnedfrom training

data

Verify &

Evaluate

Data

Warehouse

process

information

Legend

Scrub,

Verify,

Summarize

Data

Model usage +Population shiftmonitoring and

incrementallearning

algorithmModel derivation

+User guidance oflearning processOperational

DatabaseData Miner/Analyst

Interesting models

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computation

withassociated-event

ispartof

updated-by

created-by

animated-by

icon

text-segment

geometry

graph

point curve surface volume

external-eventinput-device

SQL query

discoveryalgorithm

windows/GUIprocedure

line-diagrams(xfig,pic, ...)

windows

internal-eventpredicate on DB

relativelocation

VR-atom

VR (visualrepresentation)

O

O

O

OO

1 1

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�l�

attrname

entropy

a1 0.6

a2 0.8

a3 0.5

ak 0.7

gain ... other attributes ...

bar length

Data attributeEntropy diagram has1 n

backgrnd color

x-scale y-scale

barstyle

attribute name

entropy value

entropy gain

entropy

a1 a2 a3 ak

Classification diagram-Entropy Gain

gain

y-label

x-label

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�D�

Data Attribute

Rule Id LHSRule

IdRHS Support

R1 A

R1 B

R2 A

R2 D

R1 C 2% 98%

A R D has

support

prevalence

Rules

LHS RHSNumber of rules

1 n

with size, color

GlyphLabels for

rows, columns

Association Rules Diagram - Group of Items vs Item

A B C D . . .E

. . .

. . .

AD

AB

3.3% 86%

Confidence

n 1

1 1

ER2

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�G�

acceptable

unacceptable

fromgenerated

consists-of

d

expandable

leaf non-leaf

d

d

overallerror-rate

error-rate

depth

rankingcriteria

bias

bias

searchalgorithm

traversalstrategy

model candidatecheck

Acceptable Error Rate: %6.0

non-expandable

user

modelcandidate

model atom

evaluatemodel atom

expandabilitycriteria

acceptabilitycriteria

Traversal Strategy:

Maximal Tree Size:

Design: Decision tree learning algorithm

error rateacceptable

tree sizemaximal

Breadth BestDepth

30

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PlayDont’ Play Play

Play

Play Dont’ Play Dont’ Play Play

Windy

sunnyovercast

rain

<= 75 > 75 true false

(c) Final Model Candidate

Play

Outlook

Humidity

expandable leaf model atom

non-leaf model atom

sunnyovercast rain

(b) Intermediate Model Candidate(a) Initial Model Candidate

Outlook

non-expandable leaf model atom

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Error Rate: C4.5, C4.5P, BF, CDP, CDP+

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Number of Nodes Generated: C4.5, C4.5P, BF, CDP, CDP+

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