text mining pdf articles omitting references

Marek_Lubicz

In a previous post https://community.rapidminer.com/discussion/53107/text-mining-of-multiple-pdf-files-with-separate-key-word-counts an approach for mining multiple pdf files was described.

If the pdfs are articles, is there a way to exclude References section from being mined. The section often starts with the same term (i.e. 'References'), so I tried to define some Split or a specific Tokenize option but I failed.

I would be grateful for any suggestion.

kayman

Yeah, an option to filter documents based on content would be nice, but as far as I know it's not available.

A workaround could be as follows : use the documents to data operator, and filter on the reference keyword. Next convert back to documents (or deal with it as data)

Attached a very simplified example, might get you started.

<?xml version="1.0" encoding="UTF-8"?><process version="9.2.001">
  <context>
    <input/>
    <output/>
    <macros/>
  </context>
  <operator activated="true" class="process" compatibility="9.2.001" expanded="true" name="Process">
    <parameter key="logverbosity" value="init"/>
    <parameter key="random_seed" value="2001"/>
    <parameter key="send_mail" value="never"/>
    <parameter key="notification_email" value=""/>
    <parameter key="process_duration_for_mail" value="30"/>
    <parameter key="encoding" value="SYSTEM"/>
    <process expanded="true">
      <operator activated="true" class="text:create_document" compatibility="8.1.000" expanded="true" height="68" name="Create Document" width="90" x="112" y="34">
        <parameter key="text" value="this one contains reference"/>
        <parameter key="add label" value="false"/>
        <parameter key="label_type" value="nominal"/>
      </operator>
      <operator activated="true" class="text:create_document" compatibility="8.1.000" expanded="true" height="68" name="Create Document (2)" width="90" x="112" y="136">
        <parameter key="text" value="this one doesn't"/>
        <parameter key="add label" value="false"/>
        <parameter key="label_type" value="nominal"/>
      </operator>
      <operator activated="true" class="text:create_document" compatibility="8.1.000" expanded="true" height="68" name="Create Document (3)" width="90" x="112" y="238">
        <parameter key="text" value="this one doesn't either"/>
        <parameter key="add label" value="false"/>
        <parameter key="label_type" value="nominal"/>
      </operator>
      <operator activated="true" class="text:documents_to_data" compatibility="8.1.000" expanded="true" height="124" name="Documents to Data" width="90" x="246" y="34">
        <parameter key="text_attribute" value="myDoc"/>
        <parameter key="add_meta_information" value="true"/>
        <parameter key="datamanagement" value="double_sparse_array"/>
        <parameter key="data_management" value="auto"/>
      </operator>
      <operator activated="true" class="filter_examples" compatibility="9.2.001" expanded="true" height="103" name="Filter Examples" width="90" x="380" y="34">
        <parameter key="parameter_expression" value=""/>
        <parameter key="condition_class" value="custom_filters"/>
        <parameter key="invert_filter" value="false"/>
        <list key="filters_list">
          <parameter key="filters_entry_key" value="myDoc.does_not_contain.reference"/>
        </list>
        <parameter key="filters_logic_and" value="true"/>
        <parameter key="filters_check_metadata" value="true"/>
      </operator>
      <operator activated="true" class="text:data_to_documents" compatibility="8.1.000" expanded="true" height="68" name="Data to Documents" width="90" x="514" y="34">
        <parameter key="select_attributes_and_weights" value="false"/>
        <list key="specify_weights"/>
      </operator>
      <connect from_op="Create Document" from_port="output" to_op="Documents to Data" to_port="documents 1"/>
      <connect from_op="Create Document (2)" from_port="output" to_op="Documents to Data" to_port="documents 2"/>
      <connect from_op="Create Document (3)" from_port="output" to_op="Documents to Data" to_port="documents 3"/>
      <connect from_op="Documents to Data" from_port="example set" to_op="Filter Examples" to_port="example set input"/>
      <connect from_op="Filter Examples" from_port="example set output" to_op="Data to Documents" to_port="example set"/>
      <connect from_op="Data to Documents" from_port="documents" 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>