Loading models in Java using RapidMiner 9.7

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  jczogalla Employee, Member Posts: 144 RM Engineering

  August 2020 Solution Accepted

  Hi Philipp!
  
  The ModelLoader was deprecated in 9.2 and is still available in the legacy extension, which is bundled with the RapidMiner installation, but not part of the open source core. Even with 5.3, that operator was pretty much old.
  Usually you would use the Retrieve operator instead (java class: RepositorySource), but as the name implies, this requires a repository location to read the model.
  Another thing that changed is that the file ending for models in repositories usually is ".ioo". With 9.7 we updated the repository to better support more file types and how they are stored.
  
  So I guess the "easy" way is to follow these steps:
  1) Copy the ".mod" file and rename it to end with ".ioo"
  2) Create and register a repository in code and use the Retrieve Operator
  

  <?xml version="1.0" encoding="UTF-8"?><process version="9.8.000-SNAPSHOT"></code>// create repository to load data
  Repository repo = new LocalRepository("modelRepo", pathToModelFolder<span>);
  </span>RepositoryManager.getInstance(null).addRepository(repo<span>);
  
  </span>// create retrieve operator instead of ModelLoader
  RepositorySource retrieveModel = OperatorService.createOperator(RepositorySource.class<span>);
  </span>retrieveModel.setParameter(RepositorySource.PARAMETER_REPOSITORY_ENTRY, nameOfModelWithoutFileEnding<span>);
  </span>process.getRootOperator().getSubprocess(0).addOperator(retrieveModel);</pre>Alternatively, you can just create the repo and process in RapidMiner Studio, looking something like this:<br><img alt=""><img alt=""><img alt="" src="https://us.v-cdn.net/6030995/uploads/editor/7j/o6eauqwkzzvk.png"><br>xml:<br><div class="Spoiler"><pre class="CodeBlock"><code>

    <context>
      <input/>
      <output/>
      <macros/>
    </context>
    <operator activated="true" class="process" expanded="true" name="Process">
      <parameter key="logverbosity" value="init"/>
      <parameter key="random_seed" value="2001"/>
      <parameter key="send_mail" value="never"/>
      <parameter key="process_duration_for_mail" value="30"/>
      <parameter key="encoding" value="SYSTEM"/>
      <process expanded="true">
        <operator activated="true" class="retrieve" compatibility="9.8.000-SNAPSHOT" expanded="true" height="68" name="Retrieve" width="90" x="45" y="34">
          <parameter key="repository_entry" value="modelRepo/model"/>
        </operator>
        <operator activated="true" class="apply_model" expanded="true" height="82" name="Apply Model" width="90" x="313" y="34">
          <list key="application_parameters"/>
          <parameter key="create_view" value="false"/>
        </operator>
        <connect from_port="input 1" to_op="Apply Model" to_port="unlabelled data"/>
        <connect from_op="Retrieve" from_port="output" to_op="Apply Model" to_port="model"/>
        <connect from_op="Apply Model" from_port="labelled data" to_port="result 1"/>
        <portSpacing port="source_input 1" spacing="50"/>
        <portSpacing port="source_input 2" spacing="0"/>
        <portSpacing port="sink_result 1" spacing="0"/>
        <portSpacing port="sink_result 2" spacing="0"/>
      </process>
    </operator>
  </process>

  
  Then you can store the process somewhere and create the Process instance from the xml. You still might need to setup the repo programmatically, but you don't need to build the process programmatically.
  
  I hope this helps!
  Cheers
  Jan
  
  

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