Association Rules With a Particular Structure in Rapid Minner

moeinmohebbi

In Rapid Minner , I need to generate association rules with particular structure , such as :

[temp=cold, wind=slow] --> [rain=true] 
[temp=hot , wind=slow] --> [rain=false] 
[temp=cold, wind=fast] --> [rain=true]

That prediction of raining should be a part of the conclusion. I have studied Documentation of RapidMinner, it suggests to use Regular Expression in FP-Growth node (must contain a field). But it doesn't include any samples for using regular expression in association rules. I need a sample for using regular expressions (regex) in association rules.

haddock

Hi there,

Bear in mind that FPGrowth grows the Frequent Pattern tree, from which another operator creates the rules, so using the regex filter on FPGrowth will only ensure that the rules contain the term, it will not ensure that the rules contain the term as a conclusion, check this out...

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<process version="5.3.013">
  <context>
    <input/>
    <output/>
    <macros/>
  </context>
  <operator activated="true" class="process" compatibility="5.3.013" expanded="true" name="Process">
    <process expanded="true">
      <operator activated="true" class="retrieve" compatibility="5.3.013" expanded="true" height="60" name="Iris" width="90" x="45" y="120">
        <parameter key="repository_entry" value="//Samples/data/Iris"/>
      </operator>
      <operator activated="true" class="discretize_by_frequency" compatibility="5.3.013" expanded="true" height="94" name="Discretize by Frequency" width="90" x="179" y="120">
        <parameter key="number_of_bins" value="5"/>
        <parameter key="range_name_type" value="short"/>
      </operator>
      <operator activated="true" class="nominal_to_binominal" compatibility="5.3.013" expanded="true" height="94" name="Nominal to Binominal" width="90" x="313" y="120">
        <parameter key="transform_binominal" value="true"/>
        <parameter key="use_underscore_in_name" value="true"/>
      </operator>
      <operator activated="true" class="fp_growth" compatibility="5.3.013" expanded="true" height="76" name="FPGrowth" width="90" x="447" y="120">
        <parameter key="find_min_number_of_itemsets" value="false"/>
        <parameter key="min_number_of_itemsets" value="1"/>
        <parameter key="min_support" value="0.1"/>
        <parameter key="must_contain" value="&quot;a1*|a2*&quot;"/>
      </operator>
      <operator activated="true" class="create_association_rules" compatibility="5.3.013" expanded="true" height="76" name="Create Association Rules" width="90" x="581" y="120"/>
      <connect from_op="Iris" from_port="output" to_op="Discretize by Frequency" to_port="example set input"/>
      <connect from_op="Discretize by Frequency" from_port="example set output" to_op="Nominal to Binominal" to_port="example set input"/>
      <connect from_op="Nominal to Binominal" from_port="example set output" to_op="FPGrowth" to_port="example set"/>
      <connect from_op="FPGrowth" from_port="frequent sets" to_op="Create Association Rules" to_port="item sets"/>
      <connect from_op="Create Association Rules" from_port="rules" to_port="result 1"/>
      <portSpacing port="source_input 1" spacing="0"/>
      <portSpacing port="sink_result 1" spacing="108"/>
      <portSpacing port="sink_result 2" spacing="0"/>
    </process>
  </operator>
</process>

This means that you put the regex on the frequent itemset search, as a simple string i.e "REGEX", and the rules will contain matching terms, in my example that means " make me rules that contain a1, however it gets discretized". Don't forget the quotes!

Going on to only use the rules whose conclusion matches the regex is actually quite tricky, a while back I posted a Groovy script to convert association rules to examples, that could help.

Good luck!

Shameless plug, if you want to see association rules done on news 24/7 check my link!

H

PS This machine has 5.3 ~ I think the operators work the same on 6.x