Candidate Elimination - CEDAR

More documents

Recommendations

Info

CANDIDATE-ELIMINATION Algorithm Initialize G to the set of maximally general hypotheses in H Initialize S to the set of maximally specific hypotheses in H For each training example d, do • If d is a positive example 18 • Remove from G any hypothesis inconsistent with d • For each hypothesis s in S that is not consistent with d • Remove s from S • Add to S all minimal generalizations h of s such that • h is consistent with d, and some member of G is more general than h • Remove from S any hypothesis that is more general than another hypothesis in S • If d is a negative example • Remove from S any hypothesis inconsistent with d • For each hypothesis g in G that is not consistent with d • Remove g from G • Add to G all minimal specializations of h of g such that • h is consistent with d, and some member of S is more specific than h • Remove from G any hypothesis that is less general than another hypothesis in G
An Illustrative Example • We will trace the CANDIDATE-ELIMINATION algorithm with training examples below. Example Sky AirTemp Humidity Wind Water Forecast EnjoySport 1 Sunny Warm Normal Strong Warm Same Yes 2 Sunny Warm High Strong Warm Same Yes 3 Rainy Cold High Strong Warm Change No 4 Sunny Warm High Strong Cool Change Yes 19
Page 1 and 2: Concept Learning Space of Versions
Page 3 and 4: FIND-S Algorithm : Finding a Maxima
Page 5 and 6: Hypothesis Space Search Performed b
Page 7 and 8: Representation • The CANDIDATE-EL
Page 9 and 10: Version Space: Definition • The s
Page 11 and 12: The LIST-THEN-ELIMINATE Algorithm
Page 13 and 14: Version Space with General (G) and
Page 15 and 16: Specific Boundary Definition: The s
Page 17: The CANDIDATE-ELIMINATION Algorithm
Page 21 and 22: CANDIDATE-ELIMINATION Trace (Sample
Page 23 and 24: Final Version Space for EnjoySport
Page 25 and 26: 25 Remarks on Version Spaces and CA
Page 27 and 28: What Training Example Should the Le
Page 29 and 30: Optimal query strategy • The opti
Page 31 and 32: New Instances To Be Classified Inst
Page 33 and 34: A Biased Hypothesis Space Example S
Page 35 and 36: An Unbiased Learner • EnjoySport
Page 37 and 38: Conjunctive concepts for 3 binary v
Page 39 and 40: An Unbiased Learner • New hypothe
Page 41 and 42: The Futility of Bias-Free Learning
Page 43 and 44: Inductive Bias Definition 43 •Con
Page 45 and 46: Modeling Inductive Systems by Equiv
Page 47 and 48: Summary • Concept learning can be
Page 49: Summary, continued • If the hypot

Candidate Elimination - CEDAR

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?