WEKA 3.1.8

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WEKA 3.1.8
Waikato Environment for Knowledge
Analysis http//www.cs.waikato.ac.nz/ml/weka/
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Program

• A quick overview of WEKA functionality
• WEKA demonstration
• Visualization and EG2000

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WEKA

• Command line interface
• Explorer
• Filters
• Learning (clustering, classification, assoc.
  Rules)
• Attribute selection
• Basic visualization
• Experimenter
• Testing a particular method on a set of data
• Various criteria for comparison of results

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Classification

• Meta-methods
• Another classifier is one of the parameters.
• Boosting, bagging, logitboost, metacost,
  stacking, etc.
• Methods
• SMO, k-NN, LWR, logistic...
• C4.5, m5...
• Associative rules.

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Filters

• Adding/removing attributes
• Attribute value substitution
• Discretization (MDL, Kononenko, etc.)
• Time series filters (delta, shift)
• Sampling, randomization
• Missing value management
• Normalization and other numeric transformations

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Attribute Selection

• Search methods
• Best-first.
• Genetic.
• Ranking...
• Measures
• ReliefF.
• information gain.
• Gain ratio

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Other Features

• Probability estimators
• Method evaluators
• Margin curve (difference between the predicted
  class probability and max probability of other
  classes)
• Threshold curve (varying class proportions)
• Statistics for binary class domains
• Precision correct p/total predicted P
• F-measure 2TPprecision/(TPprecision)

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My Humble Opinion

• Good
• Simplicity
• Features
• GUI
• Bad
• Kitchen sink syndrome
• Strange object hierarchy
• Incomplete documentation

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Eurographics

• Kake uporabne ideje?

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Vizualizacija

• Pristop
• Za nek tip podatkov
• najdemo dober nacin prikaza.
• Pozor
• Dobra vizualizacija namesto pravil ali
  odlocitvenih dreves.
• Dober vmesnik namesto avtomatske analize
  podatkov.
• K sreci
• Za vizualizacijo predvsem uporabljajo
  vecdimenzionalne prostorske podatke.

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Deleži
Mozaicni diagram
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Deleži 2
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Raztreseni diagram

• tudi planetni ali mehurcni diagram
• William Playfair (1759-1823)
• The Commercial and Political Atlas, 1786, uvedel
  tudi
• crtni diagram (line)
• stolpcni diagram (bar)
• tortni diagram (pie)

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Interaktivnost
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Interaktivnost 2
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Dimenzije

• figura (glyph)
• 5 dimenzij
• prostor
• barva
• velikost

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Priprava vizualizacije
dataflow
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Osnovni elementi

• Obseg
• Pozicija
• Velikost
• Sivina
• Razlika
• Smer
• Barva
• Oblika
• Vzorec

Neurejeni Urejeni Kolicinski
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Iskanje povezanosti
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