Download - Apriori.rb - LA Ruby Presentation
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AprioriA Ruby wrapper for
Christian Borgelt’s implementationof Agrawal et al.’s algorithm
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what does it do?
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picture of a grocery store
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overview
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overview
• Find regularities in shopping behavior
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overview
• Find regularities in shopping behavior
• Market Basket Analysis
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overview
• Find regularities in shopping behavior
• Market Basket Analysis
• Sets of products
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suggest items to a customer
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association rules
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association rules
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association rules
“A customer who buys apples buys cheese with 30% certainty”
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association rules
“A customer who buys apples buys cheese with 30% certainty”
Confidence
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why would we want to do this?
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picture of “buy this too”
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Example
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✓ ✓✓ ✓✓ ✓ ✓✓ ✓
✓ ✓
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✓ ✓✓ ✓✓ ✓ ✓✓ ✓
✓ ✓
Item
s
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✓ ✓✓ ✓✓ ✓ ✓✓ ✓
✓ ✓
Customers
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✓ ✓✓ ✓✓ ✓ ✓✓ ✓
✓ ✓
purchased
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✓ ✓✓ ✓✓ ✓ ✓✓ ✓
✓ ✓
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problem:
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too many possible rules
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solution:
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Don’t look at all the rules(which is how Apriori works)
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term:
Itemset:a combination of one or more items
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examples of itemsets
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examples of itemsets
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examples of itemsets
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examples of itemsets
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examples of itemsets
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Step 1) Build a prefix tree
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prefix
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prefix
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prefix
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prefix
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prefix
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prefix
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Step 2) Prune statistically insignificant rules
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statistically significant
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term:
Support:the percentage of transactions that a rule/itemset can be applied to
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✓ ✓✓ ✓✓ ✓ ✓✓ ✓
✓ ✓
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✓ ✓✓ ✓✓ ✓ ✓✓ ✓
✓ ✓
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✓ ✓✓ ✓✓ ✓ ✓✓ ✓
✓ ✓
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✓ ✓✓ ✓✓ ✓ ✓✓ ✓
✓ ✓
3/5
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✓ ✓✓ ✓✓ ✓ ✓✓ ✓
✓ ✓
3/5 = 60%
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✓ ✓✓ ✓✓ ✓ ✓✓ ✓
✓ ✓
3/5 = 60%
Support
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✓ ✓✓ ✓✓ ✓ ✓✓ ✓
✓ ✓
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✓ ✓✓ ✓✓ ✓ ✓✓ ✓
✓ ✓
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✓ ✓✓ ✓✓ ✓ ✓✓ ✓
✓ ✓
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✓ ✓✓ ✓✓ ✓ ✓✓ ✓
✓ ✓
2/5
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✓ ✓✓ ✓✓ ✓ ✓✓ ✓
✓ ✓
2/5 = 40%
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✓ ✓✓ ✓✓ ✓ ✓✓ ✓
✓ ✓
2/5 = 40%
Support
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support of:
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= 40% support of:
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The key optimization:
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= 40% support of:
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= 40% support of:
support of:
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= 40% support of:
support of:
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= 40% support of:
support of:
+
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= 40% support of:
support of:
+
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= 40% support of:
support of:
+ <= 40%
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Step 3) Find “good” rules
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✓ ✓✓ ✓✓ ✓ ✓✓ ✓
✓ ✓
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need a way to calculate “goodness”
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term:
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term:
Confidence:number of cases in which the rule is correct relative to the number of cases in which it is applicable
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✓ ✓✓ ✓✓ ✓ ✓✓ ✓
✓ ✓
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✓ ✓✓ ✓✓ ✓ ✓✓ ✓
✓ ✓
->
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✓ ✓✓ ✓✓ ✓ ✓✓ ✓
✓ ✓
->
2/2
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✓ ✓✓ ✓✓ ✓ ✓✓ ✓
✓ ✓
->
2/2 = 100%
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✓ ✓✓ ✓✓ ✓ ✓✓ ✓
✓ ✓
->
2/2 = 100%
Confidence
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✓ ✓✓ ✓✓ ✓ ✓✓ ✓
✓ ✓
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✓ ✓✓ ✓✓ ✓ ✓✓ ✓
✓ ✓
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✓ ✓✓ ✓✓ ✓ ✓✓ ✓
✓ ✓
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✓ ✓✓ ✓✓ ✓ ✓✓ ✓
✓ ✓
->
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✓ ✓✓ ✓✓ ✓ ✓✓ ✓
✓ ✓
->
1/3
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✓ ✓✓ ✓✓ ✓ ✓✓ ✓
✓ ✓
->
1/3 = 33%
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intermission
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Apriori(in ruby)
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code example
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available today
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gem install apriori
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requires: rubygems >= 1.2.0
gem update --system
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AprioriA Ruby wrapper for
Christian Borgelt’s implementationof Agrawal et al.’s algorithm
![Page 109: Apriori.rb - LA Ruby Presentation](https://reader034.vdocument.in/reader034/viewer/2022042814/553951724a79591c7b8b495f/html5/thumbnails/109.jpg)
AprioriA Ruby wrapper for
Christian Borgelt’s implementationof Agrawal et al.’s algorithm