"[Solved] Loop function"

Hi,

I have recently just started looking at this software and it looks really interesting. I am currently looking at the K-NN part of it.

First of all I was trying to process quite a lot of data, but have made it a lot smaller to try and get it to work, but I still have not managed it so I hope someone on here might be able to help me or point me in the right direction.

On the example I have pasted below, I bring in two names (the attribute is called NAME) where I want to predict a rating using the K-NN, it does not have any of my other data in it.

I then produce a loop, the attribute filter type is single, attribute is NAME and have used the default loop_attributes as the iteration macro.

In the loop I then retrieve the full data set that has lots of attributes in it, I link that to the filter and use parameter string NAME=%{loop_attributes} and then link to the K-NN, Apply Model and Performance. I am pretty sure it is ok from and including K-NN as if I put one of the NAME's instead of %{loop_attributes} it works. But if I leave it as NAME=%{loop_attributes} I get an error saying "The example has no examples".

I have tried quite a lot of things and looked at other peoples code, but I can not see what I am doing wrong, any help would be much appreciated.

Thanks,

Oli

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<process version="5.3.008">
  <context>
    <input/>
    <output/>
    <macros/>
  </context>
  <operator activated="true" class="process" compatibility="5.3.008" expanded="true" name="">
    <process expanded="true">
      <operator activated="true" class="retrieve" compatibility="5.3.008" expanded="true" height="60" name="Retrieve Names3 (2)" width="90" x="45" y="120">
        <parameter key="repository_entry" value="data/Names3"/>
      </operator>
      <operator activated="true" class="loop_attributes" compatibility="5.3.008" expanded="true" height="94" name="Loop Attributes" width="90" x="179" y="30">
        <parameter key="attribute_filter_type" value="single"/>
        <parameter key="attribute" value="NAME"/>
        <parameter key="iteration_macro" value="loop_attributes"/>
        <process expanded="true">
          <operator activated="true" class="retrieve" compatibility="5.3.008" expanded="true" height="60" name="Retrieve data aw" width="90" x="45" y="300">
            <parameter key="repository_entry" value="data/data aw"/>
          </operator>
          <operator activated="true" class="filter_examples" compatibility="5.3.008" expanded="true" height="76" name="Filter Examples" width="90" x="45" y="165">
            <parameter key="condition_class" value="attribute_value_filter"/>
            <parameter key="parameter_string" value="NAME=%{loop_attributes}"/>
          </operator>
          <operator activated="true" class="k_nn" compatibility="5.3.008" expanded="true" height="76" name="k-NN (3)" width="90" x="313" y="75"/>
          <operator activated="true" class="apply_model" compatibility="5.3.008" expanded="true" height="76" name="Apply Model (3)" width="90" x="447" y="75">
            <list key="application_parameters"/>
          </operator>
          <operator activated="true" class="performance" compatibility="5.3.008" expanded="true" height="76" name="Performance (3)" width="90" x="581" y="75"/>
          <connect from_op="Retrieve data aw" from_port="output" to_op="Filter Examples" to_port="example set input"/>
          <connect from_op="Filter Examples" from_port="example set output" to_op="k-NN (3)" to_port="training set"/>
          <connect from_op="k-NN (3)" from_port="model" to_op="Apply Model (3)" to_port="model"/>
          <connect from_op="k-NN (3)" from_port="exampleSet" to_op="Apply Model (3)" to_port="unlabelled data"/>
          <connect from_op="Apply Model (3)" from_port="labelled data" to_op="Performance (3)" to_port="labelled data"/>
          <connect from_op="Performance (3)" from_port="example set" to_port="result 1"/>
          <portSpacing port="source_example set" spacing="0"/>
          <portSpacing port="sink_example set" spacing="0"/>
          <portSpacing port="sink_result 1" spacing="0"/>
          <portSpacing port="sink_result 2" spacing="0"/>
        </process>
      </operator>
      <connect from_op="Retrieve Names3 (2)" from_port="output" to_op="Loop Attributes" to_port="example set"/>
      <connect from_op="Loop Attributes" from_port="result 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>