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Machine Learning Chapter 3. Decision Tree Learning Tom M. Mitchell
Abstract ,[object Object],[object Object],[object Object],[object Object]
Decision Tree for  PlayTennis
A Tree to Predict C-Section Risk ,[object Object],[object Object]
Decision Trees ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
When to Consider Decision Trees ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Top-Down Induction of Decision Trees ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Entropy(1/2) ,[object Object],[object Object],[object Object],[object Object],[object Object]
Entropy(2/2) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Information Gain ,[object Object]
Training Examples
Selecting the Next Attribute(1/2) ,[object Object]
Selecting the Next Attribute(2/2) S sunny   = {D1,D2,D8,D9,D11} Gain (S sunny  , Humidity)  = .970 - (3/5) 0.0 - (2/5) 0.0 = .970 Gain (S sunny  , Temperature)  = .970 - (2/5) 0.0 - (2/5) 1.0 - (1/5) 0.0 = .570 Gain (S sunny , Wind)  = .970 - (2/5) 1.0 - (3/5) .918 = .019
Hypothesis Space Search by ID3(1/2)
Hypothesis Space Search by ID3(2/2) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Inductive Bias in ID3 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Occam’s Razor ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Overfitting in Decision Trees ,[object Object],[object Object],[object Object]
Overfitting ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Overfitting in Decision Tree Learning
Avoiding Overfitting ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Reduced-Error Pruning ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Effect of Reduced-Error Pruning
Rule Post-Pruning ,[object Object],[object Object],[object Object],[object Object]
Converting A Tree to Rules ,[object Object],[object Object],[object Object],[object Object],[object Object]
Continuous Valued Attributes ,[object Object],[object Object],[object Object]
Attributes with Many Values ,[object Object],[object Object],[object Object],[object Object],[object Object]
Attributes with Costs ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Unknown Attribute Values ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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Machine Learning 3 - Decision Tree Learning