How do extract optimal value of a parameter (so I can log it)

CarlosQCarlosQ Member, University Professor Posts: 7 University Professor
edited December 2018 in Help

I have a simple process that looks remarkably similar to the one I'm posting below.

 

Basically, I want to find the optimal cut-off point for each variable and then log its name, its performance AND the cutoff point. I was successful in the first two but not in the last one. 

 

How can I get the optimal parameter from "Optimize Parameters (Grid)" so I can log it?

 

Process Below:

<?xml version="1.0" encoding="UTF-8"?><process version="7.5.001">
<context>
<input/>
<output/>
<macros/>
</context>
<operator activated="true" class="process" compatibility="7.5.001" expanded="true" name="Process">
<process expanded="true">
<operator activated="true" class="retrieve" compatibility="7.5.001" expanded="true" height="68" name="Retrieve Iris" width="90" x="112" y="238">
<parameter key="repository_entry" value="//Samples/data/Iris"/>
</operator>
<operator activated="true" class="filter_examples" compatibility="7.5.001" expanded="true" height="103" name="Filter Examples" width="90" x="313" y="238">
<parameter key="invert_filter" value="true"/>
<list key="filters_list">
<parameter key="filters_entry_key" value="label.equals.Iris-setosa"/>
</list>
</operator>
<operator activated="true" class="concurrency:loop_attributes" compatibility="7.5.001" expanded="true" height="103" name="Loop Attributes" width="90" x="514" y="238">
<process expanded="true">
<operator activated="true" class="select_attributes" compatibility="7.5.001" expanded="true" height="82" name="Select Attributes" width="90" x="112" y="34">
<parameter key="attribute_filter_type" value="single"/>
<parameter key="attribute" value="%{loop_attribute}"/>
</operator>
<operator activated="true" class="optimize_parameters_grid" compatibility="7.5.001" expanded="true" height="103" name="Optimize Parameters (Grid)" width="90" x="380" y="34">
<list key="parameters">
<parameter key="Set Macro.value" value="[0.0;8;8;linear]"/>
</list>
<process expanded="true">
<operator activated="true" class="set_macro" compatibility="7.5.001" expanded="true" height="82" name="Set Macro" width="90" x="179" y="85">
<parameter key="macro" value="cutoff"/>
<parameter key="value" value="5"/>
</operator>
<operator activated="true" class="generate_attributes" compatibility="7.5.001" expanded="true" height="82" name="Generate Attributes" width="90" x="380" y="85">
<list key="function_descriptions">
<parameter key="prediction" value="if(eval(%{loop_attribute}) &gt; eval(%{cutoff}),&quot;Iris-virginica&quot;,&quot;Iris-versicolor&quot;)"/>
</list>
</operator>
<operator activated="true" class="set_role" compatibility="7.5.001" expanded="true" height="82" name="Set Role" width="90" x="581" y="85">
<parameter key="attribute_name" value="prediction"/>
<parameter key="target_role" value="prediction"/>
<list key="set_additional_roles"/>
</operator>
<operator activated="true" class="performance" compatibility="7.5.001" expanded="true" height="82" name="Performance" width="90" x="782" y="85"/>
<connect from_port="input 1" to_op="Set Macro" to_port="through 1"/>
<connect from_op="Set Macro" from_port="through 1" to_op="Generate Attributes" to_port="example set input"/>
<connect from_op="Generate Attributes" from_port="example set output" to_op="Set Role" to_port="example set input"/>
<connect from_op="Set Role" from_port="example set output" to_op="Performance" to_port="labelled data"/>
<connect from_op="Performance" from_port="performance" to_port="performance"/>
<portSpacing port="source_input 1" spacing="0"/>
<portSpacing port="source_input 2" spacing="0"/>
<portSpacing port="sink_performance" spacing="0"/>
<portSpacing port="sink_result 1" spacing="0"/>
</process>
</operator>
<operator activated="true" class="log" compatibility="7.5.001" expanded="true" height="103" name="Log" width="90" x="715" y="34">
<list key="log">
<parameter key="variable" value="operator.Loop Attributes.value.attribute_name"/>
<parameter key="performance" value="operator.Optimize Parameters (Grid).value.performance"/>
<parameter key="cutoff" value="operator.Optimize Parameters (Grid).parameter.parameters"/>
</list>
</operator>
<connect from_port="input 1" to_op="Select Attributes" to_port="example set input"/>
<connect from_op="Select Attributes" from_port="example set output" to_op="Optimize Parameters (Grid)" to_port="input 1"/>
<connect from_op="Optimize Parameters (Grid)" from_port="performance" to_op="Log" to_port="through 1"/>
<connect from_op="Optimize Parameters (Grid)" from_port="parameter" to_op="Log" to_port="through 2"/>
<connect from_op="Log" from_port="through 1" to_port="output 1"/>
<connect from_op="Log" from_port="through 2" to_port="output 2"/>
<portSpacing port="source_input 1" spacing="0"/>
<portSpacing port="source_input 2" spacing="0"/>
<portSpacing port="sink_output 1" spacing="0"/>
<portSpacing port="sink_output 2" spacing="0"/>
<portSpacing port="sink_output 3" spacing="0"/>
</process>
</operator>
<connect from_op="Retrieve Iris" from_port="output" to_op="Filter Examples" to_port="example set input"/>
<connect from_op="Filter Examples" from_port="example set output" to_op="Loop Attributes" to_port="input 1"/>
<connect from_op="Loop Attributes" from_port="output 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>

 

Thanks in advance for any help,

 

CarlosQ 

Best Answer

  • sgenzersgenzer Administrator, Moderator, Employee, RapidMiner Certified Analyst, Community Manager, Member, University Professor, PM Moderator Posts: 2,959 Community Manager
    Solution Accepted

    so maybe the new "Parameter Set to ExampleSet" operator may be handy here?

     

    <?xml version="1.0" encoding="UTF-8"?><process version="7.5.003">
    <context>
    <input/>
    <output/>
    <macros/>
    </context>
    <operator activated="true" class="process" compatibility="7.5.003" expanded="true" name="Process">
    <process expanded="true">
    <operator activated="true" class="retrieve" compatibility="7.5.003" expanded="true" height="68" name="Retrieve Iris" width="90" x="45" y="34">
    <parameter key="repository_entry" value="//Samples/data/Iris"/>
    </operator>
    <operator activated="true" class="filter_examples" compatibility="7.5.003" expanded="true" height="103" name="Filter Examples" width="90" x="179" y="34">
    <parameter key="invert_filter" value="true"/>
    <list key="filters_list">
    <parameter key="filters_entry_key" value="label.equals.Iris-setosa"/>
    </list>
    </operator>
    <operator activated="true" class="concurrency:loop_attributes" compatibility="7.5.003" expanded="true" height="103" name="Loop Attributes" width="90" x="313" y="34">
    <process expanded="true">
    <operator activated="true" class="select_attributes" compatibility="7.5.003" expanded="true" height="82" name="Select Attributes" width="90" x="112" y="34">
    <parameter key="attribute_filter_type" value="single"/>
    <parameter key="attribute" value="%{loop_attribute}"/>
    </operator>
    <operator activated="true" class="optimize_parameters_grid" compatibility="7.5.003" expanded="true" height="103" name="Optimize Parameters (Grid)" width="90" x="380" y="34">
    <list key="parameters">
    <parameter key="Set Macro.value" value="[0.0;8;8;linear]"/>
    </list>
    <process expanded="true">
    <operator activated="true" class="set_macro" compatibility="7.5.003" expanded="true" height="82" name="Set Macro" width="90" x="179" y="85">
    <parameter key="macro" value="cutoff"/>
    <parameter key="value" value="8.0"/>
    </operator>
    <operator activated="true" class="generate_attributes" compatibility="7.5.003" expanded="true" height="82" name="Generate Attributes" width="90" x="380" y="85">
    <list key="function_descriptions">
    <parameter key="prediction" value="if(eval(%{loop_attribute}) &gt; eval(%{cutoff}),&quot;Iris-virginica&quot;,&quot;Iris-versicolor&quot;)"/>
    </list>
    </operator>
    <operator activated="true" class="set_role" compatibility="7.5.003" expanded="true" height="82" name="Set Role" width="90" x="581" y="85">
    <parameter key="attribute_name" value="prediction"/>
    <parameter key="target_role" value="prediction"/>
    <list key="set_additional_roles"/>
    </operator>
    <operator activated="true" class="performance" compatibility="7.5.003" expanded="true" height="82" name="Performance" width="90" x="782" y="85"/>
    <connect from_port="input 1" to_op="Set Macro" to_port="through 1"/>
    <connect from_op="Set Macro" from_port="through 1" to_op="Generate Attributes" to_port="example set input"/>
    <connect from_op="Generate Attributes" from_port="example set output" to_op="Set Role" to_port="example set input"/>
    <connect from_op="Set Role" from_port="example set output" to_op="Performance" to_port="labelled data"/>
    <connect from_op="Performance" from_port="performance" to_port="performance"/>
    <portSpacing port="source_input 1" spacing="0"/>
    <portSpacing port="source_input 2" spacing="0"/>
    <portSpacing port="sink_performance" spacing="0"/>
    <portSpacing port="sink_result 1" spacing="0"/>
    </process>
    </operator>
    <operator activated="true" class="converters:parameter_set_2_example_set" compatibility="0.3.001" expanded="true" height="103" name="Parameter Set to ExampleSet" width="90" x="514" y="187">
    <parameter key="Try to estimate type of parameters" value="true"/>
    </operator>
    <operator activated="true" class="log" compatibility="7.5.003" expanded="true" height="82" name="Log" width="90" x="715" y="34">
    <list key="log">
    <parameter key="variable" value="operator.Loop Attributes.value.attribute_name"/>
    <parameter key="performance" value="operator.Optimize Parameters (Grid).value.performance"/>
    <parameter key="cutoff" value="operator.Optimize Parameters (Grid).parameter.parameters"/>
    </list>
    </operator>
    <connect from_port="input 1" to_op="Select Attributes" to_port="example set input"/>
    <connect from_op="Select Attributes" from_port="example set output" to_op="Optimize Parameters (Grid)" to_port="input 1"/>
    <connect from_op="Optimize Parameters (Grid)" from_port="performance" to_op="Log" to_port="through 1"/>
    <connect from_op="Optimize Parameters (Grid)" from_port="parameter" to_op="Parameter Set to ExampleSet" to_port="parameters"/>
    <connect from_op="Parameter Set to ExampleSet" from_port="exampleSet" to_port="output 2"/>
    <connect from_op="Log" from_port="through 1" to_port="output 1"/>
    <portSpacing port="source_input 1" spacing="0"/>
    <portSpacing port="source_input 2" spacing="0"/>
    <portSpacing port="sink_output 1" spacing="0"/>
    <portSpacing port="sink_output 2" spacing="126"/>
    <portSpacing port="sink_output 3" spacing="21"/>
    </process>
    </operator>
    <operator activated="true" class="append" compatibility="7.5.003" expanded="true" height="82" name="Append" width="90" x="514" y="136"/>
    <connect from_op="Retrieve Iris" from_port="output" to_op="Filter Examples" to_port="example set input"/>
    <connect from_op="Filter Examples" from_port="example set output" to_op="Loop Attributes" to_port="input 1"/>
    <connect from_op="Loop Attributes" from_port="output 1" to_port="result 1"/>
    <connect from_op="Loop Attributes" from_port="output 2" to_op="Append" to_port="example set 1"/>
    <connect from_op="Append" from_port="merged set" to_port="result 2"/>
    <portSpacing port="source_input 1" spacing="0"/>
    <portSpacing port="sink_result 1" spacing="0"/>
    <portSpacing port="sink_result 2" spacing="0"/>
    <portSpacing port="sink_result 3" spacing="0"/>
    </process>
    </operator>
    </process>

    Scott

Answers

  • Telcontar120Telcontar120 Moderator, RapidMiner Certified Analyst, RapidMiner Certified Expert, Member Posts: 1,635 Unicorn

    If you are using the Optimize operator, then the output port labeled "parameter" delivers the actual parameter values that are optimized via a text output panel.

     

    Brian T.
    Lindon Ventures 
    Data Science Consulting from Certified RapidMiner Experts
  • CarlosQCarlosQ Member, University Professor Posts: 7 University Professor

    Thank you Brian. That's what I thought, but it does not work. When I log the parameter port, I don't get the optimal value of the macro I'm optimizing. I get the last column of the table below. I would like the values of 6, 3, 5 and 2 (the optimal values).

     

    Screen Shot 2017-08-10 at 10.05.36 AM.png

  • Thomas_OttThomas_Ott RapidMiner Certified Analyst, RapidMiner Certified Expert, Member Posts: 1,761 Unicorn

    Your log for the macro is not set correctly.

     

    Something like this perhaps?

     

    <?xml version="1.0" encoding="UTF-8"?><process version="7.5.003">
    <context>
    <input/>
    <output/>
    <macros/>
    </context>
    <operator activated="true" class="process" compatibility="7.5.003" expanded="true" name="Process">
    <process expanded="true">
    <operator activated="true" class="retrieve" compatibility="7.5.003" expanded="true" height="68" name="Retrieve Iris" width="90" x="45" y="34">
    <parameter key="repository_entry" value="//Samples/data/Iris"/>
    </operator>
    <operator activated="true" class="filter_examples" compatibility="7.5.003" expanded="true" height="103" name="Filter Examples" width="90" x="179" y="34">
    <parameter key="invert_filter" value="true"/>
    <list key="filters_list">
    <parameter key="filters_entry_key" value="label.equals.Iris-setosa"/>
    </list>
    </operator>
    <operator activated="true" class="concurrency:loop_attributes" compatibility="7.5.003" expanded="true" height="103" name="Loop Attributes" width="90" x="313" y="34">
    <process expanded="true">
    <operator activated="true" class="select_attributes" compatibility="7.5.003" expanded="true" height="82" name="Select Attributes" width="90" x="112" y="34">
    <parameter key="attribute_filter_type" value="single"/>
    <parameter key="attribute" value="%{loop_attribute}"/>
    </operator>
    <operator activated="true" class="optimize_parameters_grid" compatibility="7.5.003" expanded="true" height="103" name="Optimize Parameters (Grid)" width="90" x="246" y="34">
    <list key="parameters">
    <parameter key="Set Macro.value" value="[0.0;8;8;linear]"/>
    </list>
    <process expanded="true">
    <operator activated="true" class="set_macro" compatibility="7.5.003" expanded="true" height="82" name="Set Macro" width="90" x="45" y="34">
    <parameter key="macro" value="cutoff"/>
    <parameter key="value" value="8.0"/>
    </operator>
    <operator activated="true" class="generate_attributes" compatibility="7.5.003" expanded="true" height="82" name="Generate Attributes" width="90" x="179" y="34">
    <list key="function_descriptions">
    <parameter key="prediction" value="if(eval(%{loop_attribute}) &gt; eval(%{cutoff}),&quot;Iris-virginica&quot;,&quot;Iris-versicolor&quot;)"/>
    </list>
    </operator>
    <operator activated="true" class="set_role" compatibility="7.5.003" expanded="true" height="82" name="Set Role" width="90" x="313" y="34">
    <parameter key="attribute_name" value="prediction"/>
    <parameter key="target_role" value="prediction"/>
    <list key="set_additional_roles"/>
    </operator>
    <operator activated="true" class="performance" compatibility="7.5.003" expanded="true" height="82" name="Performance" width="90" x="447" y="34"/>
    <connect from_port="input 1" to_op="Set Macro" to_port="through 1"/>
    <connect from_op="Set Macro" from_port="through 1" to_op="Generate Attributes" to_port="example set input"/>
    <connect from_op="Generate Attributes" from_port="example set output" to_op="Set Role" to_port="example set input"/>
    <connect from_op="Set Role" from_port="example set output" to_op="Performance" to_port="labelled data"/>
    <connect from_op="Performance" from_port="performance" to_port="performance"/>
    <portSpacing port="source_input 1" spacing="0"/>
    <portSpacing port="source_input 2" spacing="0"/>
    <portSpacing port="sink_performance" spacing="0"/>
    <portSpacing port="sink_result 1" spacing="0"/>
    <description align="center" color="yellow" colored="false" height="105" resized="false" width="180" x="274" y="126">Type your comment</description>
    </process>
    </operator>
    <operator activated="true" class="log" compatibility="7.5.003" expanded="true" height="103" name="Log" width="90" x="380" y="34">
    <list key="log">
    <parameter key="variable" value="operator.Loop Attributes.value.attribute_name"/>
    <parameter key="performance" value="operator.Optimize Parameters (Grid).value.performance"/>
    <parameter key="cutoff" value="operator.Set Macro.value.macro_value"/>
    </list>
    </operator>
    <connect from_port="input 1" to_op="Select Attributes" to_port="example set input"/>
    <connect from_op="Select Attributes" from_port="example set output" to_op="Optimize Parameters (Grid)" to_port="input 1"/>
    <connect from_op="Optimize Parameters (Grid)" from_port="performance" to_op="Log" to_port="through 1"/>
    <connect from_op="Optimize Parameters (Grid)" from_port="parameter" to_op="Log" to_port="through 2"/>
    <connect from_op="Log" from_port="through 1" to_port="output 1"/>
    <connect from_op="Log" from_port="through 2" to_port="output 2"/>
    <portSpacing port="source_input 1" spacing="0"/>
    <portSpacing port="source_input 2" spacing="0"/>
    <portSpacing port="sink_output 1" spacing="0"/>
    <portSpacing port="sink_output 2" spacing="0"/>
    <portSpacing port="sink_output 3" spacing="0"/>
    </process>
    </operator>
    <connect from_op="Retrieve Iris" from_port="output" to_op="Filter Examples" to_port="example set input"/>
    <connect from_op="Filter Examples" from_port="example set output" to_op="Loop Attributes" to_port="input 1"/>
    <connect from_op="Loop Attributes" from_port="output 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>
  • CarlosQCarlosQ Member, University Professor Posts: 7 University Professor

    Thanks Thomas. I tried that too. The problem is that it returns the last value of the macro and not the optimal. The grid goes from 0 to 8 in steps of 1. It always returns 8. 

  • CarlosQCarlosQ Member, University Professor Posts: 7 University Professor

    Thanks  a million Scott. Your code does the trick. 

     

    I adapted your code and now I have the table I wanted. It's kind of convoluted (ParameterSet to Example Set + Extract Macro ) but it does the trick (good enough for me).

     

    The process I was asking about in this question was part of a larger process. In the first part I would try different values for a parameter (using Optimize Parameters with Grid) and after finding the optimal I would do a second part. For a while I thought the macro "cutoff" would store the optimal value and not the last one. Should this be the default behavior (optimal and not last)? It took me a while to discover that it does not. 

     

    Thanks to all of you (Bryan, Thomas, Scott) for your time and effort.

     

    My final code below:

     

    <?xml version="1.0" encoding="UTF-8"?><process version="7.5.003">
    <context>
    <input/>
    <output/>
    <macros/>
    </context>
    <operator activated="true" class="process" compatibility="7.5.003" expanded="true" name="Process">
    <process expanded="true">
    <operator activated="true" class="retrieve" compatibility="7.5.003" expanded="true" height="68" name="Retrieve Iris" width="90" x="45" y="34">
    <parameter key="repository_entry" value="//Samples/data/Iris"/>
    </operator>
    <operator activated="true" class="filter_examples" compatibility="7.5.003" expanded="true" height="103" name="Filter Examples" width="90" x="179" y="34">
    <parameter key="invert_filter" value="true"/>
    <list key="filters_list">
    <parameter key="filters_entry_key" value="label.equals.Iris-setosa"/>
    </list>
    </operator>
    <operator activated="true" class="concurrency:loop_attributes" compatibility="7.5.003" expanded="true" height="82" name="Loop Attributes" width="90" x="380" y="34">
    <process expanded="true">
    <operator activated="true" class="select_attributes" compatibility="7.5.003" expanded="true" height="82" name="Select Attributes" width="90" x="112" y="34">
    <parameter key="attribute_filter_type" value="single"/>
    <parameter key="attribute" value="%{loop_attribute}"/>
    </operator>
    <operator activated="true" class="optimize_parameters_grid" compatibility="7.5.003" expanded="true" height="103" name="Optimize Parameters (Grid)" width="90" x="380" y="34">
    <list key="parameters">
    <parameter key="Set Macro.value" value="[0.0;8;8;linear]"/>
    </list>
    <process expanded="true">
    <operator activated="true" class="set_macro" compatibility="7.5.003" expanded="true" height="82" name="Set Macro" width="90" x="179" y="85">
    <parameter key="macro" value="cutoff"/>
    <parameter key="value" value="8.0"/>
    </operator>
    <operator activated="true" class="generate_attributes" compatibility="7.5.003" expanded="true" height="82" name="Generate Attributes" width="90" x="380" y="85">
    <list key="function_descriptions">
    <parameter key="prediction" value="if(eval(%{loop_attribute}) &gt; eval(%{cutoff}),&quot;Iris-virginica&quot;,&quot;Iris-versicolor&quot;)"/>
    </list>
    </operator>
    <operator activated="true" class="set_role" compatibility="7.5.003" expanded="true" height="82" name="Set Role" width="90" x="581" y="85">
    <parameter key="attribute_name" value="prediction"/>
    <parameter key="target_role" value="prediction"/>
    <list key="set_additional_roles"/>
    </operator>
    <operator activated="true" class="performance" compatibility="7.5.003" expanded="true" height="82" name="Performance" width="90" x="782" y="85"/>
    <connect from_port="input 1" to_op="Set Macro" to_port="through 1"/>
    <connect from_op="Set Macro" from_port="through 1" to_op="Generate Attributes" to_port="example set input"/>
    <connect from_op="Generate Attributes" from_port="example set output" to_op="Set Role" to_port="example set input"/>
    <connect from_op="Set Role" from_port="example set output" to_op="Performance" to_port="labelled data"/>
    <connect from_op="Performance" from_port="performance" to_port="performance"/>
    <portSpacing port="source_input 1" spacing="0"/>
    <portSpacing port="source_input 2" spacing="0"/>
    <portSpacing port="sink_performance" spacing="0"/>
    <portSpacing port="sink_result 1" spacing="0"/>
    </process>
    </operator>
    <operator activated="true" class="converters:parameter_set_2_example_set" compatibility="0.3.001" expanded="true" height="103" name="Parameter Set to ExampleSet" width="90" x="447" y="187">
    <parameter key="Try to estimate type of parameters" value="true"/>
    </operator>
    <operator activated="true" class="extract_macro" compatibility="7.5.003" expanded="true" height="68" name="Extract Macro" width="90" x="581" y="136">
    <parameter key="macro" value="optimal_cutoff"/>
    <parameter key="macro_type" value="statistics"/>
    <parameter key="attribute_name" value="Set Macro.value"/>
    <list key="additional_macros"/>
    </operator>
    <operator activated="true" class="log" compatibility="7.5.003" expanded="true" height="103" name="Log" width="90" x="715" y="34">
    <list key="log">
    <parameter key="variable" value="operator.Loop Attributes.value.attribute_name"/>
    <parameter key="performance" value="operator.Optimize Parameters (Grid).value.performance"/>
    <parameter key="cutoff" value="operator.Extract Macro.value.macro_value"/>
    </list>
    </operator>
    <connect from_port="input 1" to_op="Select Attributes" to_port="example set input"/>
    <connect from_op="Select Attributes" from_port="example set output" to_op="Optimize Parameters (Grid)" to_port="input 1"/>
    <connect from_op="Optimize Parameters (Grid)" from_port="performance" to_op="Log" to_port="through 1"/>
    <connect from_op="Optimize Parameters (Grid)" from_port="parameter" to_op="Parameter Set to ExampleSet" to_port="parameters"/>
    <connect from_op="Parameter Set to ExampleSet" from_port="exampleSet" to_op="Extract Macro" to_port="example set"/>
    <connect from_op="Extract Macro" from_port="example set" to_op="Log" to_port="through 2"/>
    <connect from_op="Log" from_port="through 1" to_port="output 1"/>
    <portSpacing port="source_input 1" spacing="0"/>
    <portSpacing port="source_input 2" spacing="0"/>
    <portSpacing port="sink_output 1" spacing="0"/>
    <portSpacing port="sink_output 2" spacing="126"/>
    </process>
    </operator>
    <connect from_op="Retrieve Iris" from_port="output" to_op="Filter Examples" to_port="example set input"/>
    <connect from_op="Filter Examples" from_port="example set output" to_op="Loop Attributes" to_port="input 1"/>
    <connect from_op="Loop Attributes" from_port="output 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>
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