[SOLVED] Condtion Based Process Execution

rowan_g

Hi,

I'm not sure if this is possible with RapidMiner but I'll ask anyway - RapidMiner continues to surprise me with it's limitless capabilities.

I want to execute an existing process using the "Execute Process" operator but only under 1 condition.
For example, If att1 contains X then execute process.

Thanks again!

Cheers,

Skirzynski

Hey,

RapidMiner has a "Branch"-operator which you can use for this purpose. Inside this operator you will see two subprocesses "then" and "else". Depending on the condition either the "then"- or the "else"-subprocess will be executed. So in the "then"-case you can execute your process.

Regarding your condition you have to hack a little bit, since the "attribute_value_filter" tests all values for a value, so you can not check if it contains a value directly. But with the help of the "Filter Example" operator you can filter out all example with this value and use the "min_examples" condition. See the example process and replace the log-operators inside the branch operator accordingly.

Best
  Marcin

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<process version="5.3.009">
  <context>
    <input/>
    <output/>
    <macros/>
  </context>
  <operator activated="true" class="process" compatibility="5.3.009" expanded="true" name="Process">
    <process expanded="true">
      <operator activated="true" class="generate_nominal_data" compatibility="5.3.009" expanded="true" height="60" name="Generate Nominal Data" width="90" x="45" y="75">
        <parameter key="number_examples" value="10"/>
        <parameter key="number_of_attributes" value="1"/>
      </operator>
      <operator activated="true" class="filter_examples" compatibility="5.3.009" expanded="true" height="76" name="Filter Examples" width="90" x="179" y="75">
        <parameter key="condition_class" value="attribute_value_filter"/>
        <parameter key="parameter_string" value="att1=value0"/>
      </operator>
      <operator activated="true" class="branch" compatibility="5.3.009" expanded="true" height="94" name="Branch" width="90" x="313" y="75">
        <parameter key="condition_type" value="min_examples"/>
        <parameter key="condition_value" value="0"/>
        <process expanded="true">
          <operator activated="true" class="print_to_console" compatibility="5.3.009" expanded="true" height="76" name="Execute" width="90" x="45" y="30">
            <parameter key="log_value" value="Execute process"/>
          </operator>
          <connect from_port="condition" to_op="Execute" to_port="through 1"/>
          <connect from_op="Execute" from_port="through 1" to_port="input 1"/>
          <portSpacing port="source_condition" spacing="0"/>
          <portSpacing port="source_input 1" spacing="0"/>
          <portSpacing port="source_input 2" spacing="0"/>
          <portSpacing port="sink_input 1" spacing="0"/>
          <portSpacing port="sink_input 2" spacing="0"/>
        </process>
        <process expanded="true">
          <operator activated="true" class="print_to_console" compatibility="5.3.009" expanded="true" height="76" name="Idle" width="90" x="45" y="30">
            <parameter key="log_value" value="Do nothing"/>
          </operator>
          <connect from_port="condition" to_op="Idle" to_port="through 1"/>
          <connect from_op="Idle" from_port="through 1" to_port="input 1"/>
          <portSpacing port="source_condition" spacing="0"/>
          <portSpacing port="source_input 1" spacing="0"/>
          <portSpacing port="source_input 2" spacing="0"/>
          <portSpacing port="sink_input 1" spacing="0"/>
          <portSpacing port="sink_input 2" spacing="0"/>
        </process>
      </operator>
      <connect from_op="Generate Nominal Data" from_port="output" to_op="Filter Examples" to_port="example set input"/>
      <connect from_op="Filter Examples" from_port="example set output" to_op="Branch" to_port="condition"/>
      <connect from_op="Filter Examples" from_port="original" to_op="Branch" to_port="input 1"/>
      <connect from_op="Branch" from_port="input 1" to_port="result 1"/>
      <portSpacing port="source_input 1" spacing="0"/>
      <portSpacing port="sink_result 1" spacing="0"/>
      <portSpacing port="sink_result 2" spacing="0"/>
    </process>
  </operator>
</process>

rowan_g

Hi Marcin,

Thanks for that. I also figured out another way to do it using the "Select Subprocess" Operator. I used some macros to generate the "1" or "2" value required to execute the different processes. I think your solution is probably more robust though.

Cheers,
Rowan