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"Can I break the loop attributes prematurely?"

wessel

Dear all,

Can I break the loop attributes prematurely?
Alternatively, can I use some other loop operator that builds the resulting dataset in a similar way to loop attributes?

E.g.
Loop over all attributes, unless a certain amount of time has passed, then stop the loop and continue the process.

Best regards,

Wessel

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Loops + Branches

Accepted answers

All comments

Andrew2

Hello

The Loop operator has a "limit time" option. You'd have to work at it but I suppose it would be possible.

regards

Andrew

bkriever

You could put loop attributes inside a handle exceptions operator and essentially make it fail, then recall your dataset outside of the handle exceptions operator.
To make it fail you can use a branch operator to send an empty data set into the example output so nothing will come back through for the loop.
In my example my criteria was just "%{loop_attribute}"=="att5". Hope that helps!

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<process version="6.1.000">
<context>
<input/>
<output/>
<macros/>
</context>
<operator activated="true" class="process" compatibility="6.1.000" expanded="true" name="Process">
<process expanded="true">
<operator activated="true" class="generate_data_user_specification" compatibility="6.1.000" expanded="true" height="60" name="Generate Data by User Specification" width="90" x="45" y="30">
<list key="attribute_values">
<parameter key="att1" value="1"/>
<parameter key="att2" value="1"/>
<parameter key="att3" value="1"/>
<parameter key="att4" value="1"/>
<parameter key="att5" value="1"/>
<parameter key="att6" value="1"/>
<parameter key="att7" value="1"/>
</list>
<list key="set_additional_roles"/>
</operator>
<operator activated="true" class="handle_exception" compatibility="6.1.000" expanded="true" height="76" name="Handle Exception" width="90" x="179" y="30">
<process expanded="true">
<operator activated="true" class="loop_attributes" compatibility="6.1.000" expanded="true" height="94" name="Loop Attributes" width="90" x="112" y="30">
<process expanded="true">
<operator activated="true" class="select_attributes" compatibility="6.1.000" expanded="true" height="76" name="Select Attributes" width="90" x="112" y="30">
<parameter key="attribute_filter_type" value="single"/>
<parameter key="attribute" value="%{loop_attribute}"/>
</operator>
<operator activated="true" class="branch" compatibility="6.1.000" expanded="true" height="94" name="Branch (2)" width="90" x="313" y="30">
<parameter key="condition_type" value="expression"/>
<parameter key="condition_value" value=""%{loop_attribute}"=="att5""/>
<process expanded="true">
<operator activated="true" class="remember" compatibility="6.1.000" expanded="true" height="60" name="Remember" width="90" x="112" y="30">
<parameter key="name" value="Test"/>
</operator>
<connect from_port="condition" to_op="Remember" to_port="store"/>
<connect from_op="Remember" from_port="stored" to_port="input 2"/>
<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"/>
<portSpacing port="sink_input 3" spacing="0"/>
</process>
<process expanded="true">
<connect from_port="input 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"/>
<portSpacing port="sink_input 3" spacing="0"/>
</process>
</operator>
<connect from_port="example set" to_op="Select Attributes" to_port="example set input"/>
<connect from_op="Select Attributes" from_port="example set output" to_op="Branch (2)" to_port="condition"/>
<connect from_op="Select Attributes" from_port="original" to_op="Branch (2)" to_port="input 1"/>
<connect from_op="Branch (2)" from_port="input 1" to_port="example set"/>
<connect from_op="Branch (2)" from_port="input 2" 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_port="in 1" to_op="Loop Attributes" to_port="example set"/>
<connect from_op="Loop Attributes" from_port="example set" to_port="out 1"/>
<portSpacing port="source_in 1" spacing="0"/>
<portSpacing port="source_in 2" spacing="0"/>
<portSpacing port="sink_out 1" spacing="0"/>
<portSpacing port="sink_out 2" spacing="0"/>
</process>
<process expanded="true">
<connect from_port="in 1" to_port="out 1"/>
<portSpacing port="source_in 1" spacing="0"/>
<portSpacing port="source_in 2" spacing="0"/>
<portSpacing port="sink_out 1" spacing="0"/>
<portSpacing port="sink_out 2" spacing="0"/>
</process>
</operator>
<operator activated="true" class="recall" compatibility="6.1.000" expanded="true" height="60" name="Recall" width="90" x="313" y="30">
<parameter key="name" value="Test"/>
</operator>
<connect from_op="Generate Data by User Specification" from_port="output" to_op="Handle Exception" to_port="in 1"/>
<connect from_op="Recall" from_port="result" 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>

wessel

Thanks for your reply!

I was aware of this option.
But the output from "Loop Attributes" is special.
It doesn't create a collection of "resulting example sets".
Instead it continuously keeps adding columns.
In my result I really need 1 dataset to be the result, not a collection of datasets.

edit:
Currently playing around with the handle exception, as suggested by bkriever, I'll update later.

Any suggestions?

Best regards,

Wessel

Andrew2

You could use Recall and Remember inside the loop and have nothing explicitly output by the loop itself. After the loop do a final Recall. This has the side effect that much less memory is used.

wessel

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<process version="5.3.015">
<context>
<input/>
<output/>
<macros/>
</context>
<operator activated="true" class="process" compatibility="5.3.015" expanded="true" name="Process">
<process expanded="true">
<operator activated="true" class="generate_data" compatibility="5.3.015" expanded="true" height="60" name="Generate Data" width="90" x="45" y="30"/>
<operator activated="true" class="remember" compatibility="5.3.015" expanded="true" height="60" name="Remember" width="90" x="180" y="30">
<parameter key="name" value="A"/>
<parameter key="io_object" value="ExampleSet"/>
</operator>
<operator activated="true" class="loop" compatibility="5.3.015" expanded="true" height="76" name="Loop" width="90" x="313" y="30">
<parameter key="set_iteration_macro" value="true"/>
<parameter key="macro_name" value="Q"/>
<parameter key="macro_start_value" value="10"/>
<parameter key="iterations" value="12"/>
<process expanded="true">
<operator activated="true" class="recall" compatibility="5.3.015" expanded="true" height="60" name="Recall" width="90" x="179" y="75">
<parameter key="name" value="A"/>
<parameter key="io_object" value="ExampleSet"/>
</operator>
<operator activated="true" class="generate_attributes" compatibility="5.3.015" expanded="true" height="76" name="Generate Attributes" width="90" x="313" y="75">
<list key="function_descriptions">
<parameter key="att1 * %{Q}" value="att1 * %{Q}"/>
</list>
</operator>
<operator activated="true" class="remember" compatibility="5.3.015" expanded="true" height="60" name="Remember (2)" width="90" x="447" y="75">
<parameter key="name" value="A"/>
<parameter key="io_object" value="ExampleSet"/>
</operator>
<connect from_op="Recall" from_port="result" to_op="Generate Attributes" to_port="example set input"/>
<connect from_op="Generate Attributes" from_port="example set output" to_op="Remember (2)" to_port="store"/>
<portSpacing port="source_input 1" spacing="0"/>
<portSpacing port="source_input 2" spacing="0"/>
<portSpacing port="sink_output 1" spacing="0"/>
</process>
</operator>
<operator activated="true" class="recall" compatibility="5.3.015" expanded="true" height="60" name="Recall (2)" width="90" x="450" y="30">
<parameter key="name" value="A"/>
<parameter key="io_object" value="ExampleSet"/>
</operator>
<connect from_op="Generate Data" from_port="output" to_op="Remember" to_port="store"/>
<connect from_op="Remember" from_port="stored" to_op="Loop" to_port="input 1"/>
<connect from_op="Recall (2)" from_port="result" 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>

wessel

In my post above I managed to implement the remember and recall procedure as suggested by awchisholm.

What I really dislike about this way of doing things, is that the recall block does not have an import port.
So I need to be really careful not to get bugs from a incorrect execution order.

Having said this, big thanks awchisholm.
Never knew this could be used to remedy memory issues!

Best regards,

Wessel

Andrew2

To force the execution order, a trick is to use a "Subprocess" operator containing the "Recall" operator.

Here's an example http://rapidminernotes.blogspot.co.uk/2012/11/using-subprocess-operator-to-stop.html

regards

Andrew

wessel

Awesome, thanks!