"Expectation Mazimization Clustering very, very slow."

Nick595

Hi all, 

I'm learning more about Expectation Maximization Clustering, which I believe could be very helpful for my thesis. I have a dataset that contains a few hundred of reviews. I want to discover hidden topics within these reviews, and see the probability that a review belongs to cluster 1, cluster 2, etc. However, when trying to stem and tokenize the data, and then clustering, the process is taking hours. I have 8GB available, but after 3 hours there is still no result. 

My process is below

 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
<process version="6.5.001">
  <context>
    <input/>
    <output/>
    <macros/>
  </context>
  <operator activated="true" class="process" compatibility="6.5.001" expanded="true" name="Process">
    <process expanded="true">
      <operator activated="true" class="read_excel" compatibility="6.5.001" expanded="true" height="60" name="Read Excel" width="90" x="45" y="30">
        <parameter key="excel_file" value="C:\Users\Nick\Documents\Thesis DataSets\AudioSentenceReview2.xlsx"/>
        <parameter key="imported_cell_range" value="B1:B1337"/>
        <parameter key="first_row_as_names" value="false"/>
        <list key="annotations">
          <parameter key="0" value="Name"/>
        </list>
        <list key="data_set_meta_data_information">
          <parameter key="0" value="Sentence .true.text.attribute"/>
        </list>
      </operator>
      <operator activated="true" class="nominal_to_text" compatibility="6.5.001" expanded="true" height="76" name="Nominal to Text" width="90" x="112" y="120"/>
      <operator activated="true" class="text:process_document_from_data" compatibility="6.5.000" expanded="true" height="76" name="Process Documents from Data" width="90" x="246" y="210">
        <parameter key="keep_text" value="true"/>
        <parameter key="prune_method" value="absolute"/>
        <parameter key="prune_below_absolute" value="2"/>
        <parameter key="prune_above_absolute" value="999"/>
        <list key="specify_weights"/>
        <process expanded="true">
          <operator activated="true" class="text:tokenize" compatibility="6.5.000" expanded="true" height="60" name="Tokenize" width="90" x="112" y="30"/>
          <operator activated="true" class="text:transform_cases" compatibility="6.5.000" expanded="true" height="60" name="Transform Cases" width="90" x="246" y="30"/>
          <operator activated="true" class="text:filter_stopwords_english" compatibility="6.5.000" expanded="true" height="60" name="Filter Stopwords (English)" width="90" x="447" y="120"/>
          <operator activated="true" class="text:stem_snowball" compatibility="6.5.000" expanded="true" height="60" name="Stem (Snowball)" width="90" x="447" y="255"/>
          <operator activated="true" class="text:filter_by_length" compatibility="6.5.000" expanded="true" height="60" name="Filter Tokens (by Length)" width="90" x="514" y="30">
            <parameter key="min_chars" value="3"/>
            <parameter key="max_chars" value="99"/>
          </operator>
          <connect from_port="document" to_op="Tokenize" to_port="document"/>
          <connect from_op="Tokenize" from_port="document" to_op="Transform Cases" to_port="document"/>
          <connect from_op="Transform Cases" from_port="document" to_op="Filter Stopwords (English)" to_port="document"/>
          <connect from_op="Filter Stopwords (English)" from_port="document" to_op="Stem (Snowball)" to_port="document"/>
          <connect from_op="Stem (Snowball)" from_port="document" to_op="Filter Tokens (by Length)" to_port="document"/>
          <connect from_op="Filter Tokens (by Length)" from_port="document" to_port="document 1"/>
          <portSpacing port="source_document" spacing="0"/>
          <portSpacing port="sink_document 1" spacing="0"/>
          <portSpacing port="sink_document 2" spacing="0"/>
        </process>
      </operator>
      <operator activated="true" class="expectation_maximization_clustering" compatibility="6.5.001" expanded="true" height="76" name="Clustering (2)" width="90" x="380" y="120"/>
      <operator activated="true" class="write_excel" compatibility="6.5.001" expanded="true" height="76" name="Write Excel" width="90" x="514" y="255">
        <parameter key="excel_file" value="C:\Users\Nick\Documents\excelbestand 1.xlsx"/>
      </operator>
      <connect from_op="Read Excel" from_port="output" to_op="Nominal to Text" to_port="example set input"/>
      <connect from_op="Nominal to Text" from_port="example set output" to_op="Process Documents from Data" to_port="example set"/>
      <connect from_op="Process Documents from Data" from_port="example set" to_op="Clustering (2)" to_port="example set"/>
      <connect from_op="Clustering (2)" from_port="cluster model" to_port="result 1"/>
      <connect from_op="Clustering (2)" from_port="clustered set" to_op="Write Excel" to_port="input"/>
      <connect from_op="Write Excel" from_port="through" 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>

Could anyone explain to me what im doing wrong here?