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Vector Creation TF-IDF

Hey all,

does the TF IDF vector creation have a certain number of records that MUST be present?

BR

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Accepted answers

hi @Flixport here's a rather lengthy explanation of TF-IDF that I wrote a while ago:

https://community.rapidminer.com/discussion/46333/term-frequencies-and-tf-idf-how-are-these-calculated

Scott

Your prune settings are incorrect, when using percentual ensure you use a range like 0 to 80 or so. Now you prune everything above 0.4% while I assume you want 40% instead.

All comments

hi @Flixport here's a rather lengthy explanation of TF-IDF that I wrote a while ago:

https://community.rapidminer.com/discussion/46333/term-frequencies-and-tf-idf-how-are-these-calculated

Scott

thanks for the answer. What surprises me here is that I use TF IDF but I don't get the words spit out as output of the records.

<?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="UTF-8"/>
    <process expanded="true">
      <operator activated="true" class="read_csv" compatibility="9.2.001" expanded="true" height="68" name="Read CSV" width="90" x="45" y="34">
        <parameter key="csv_file" value="C:\Users\Araz\Desktop\reut2-10N.csv"/>
        <parameter key="column_separators" value=";"/>
        <parameter key="trim_lines" value="false"/>
        <parameter key="use_quotes" value="true"/>
        <parameter key="quotes_character" value="""/>
        <parameter key="escape_character" value="\"/>
        <parameter key="skip_comments" value="true"/>
        <parameter key="comment_characters" value="#"/>
        <parameter key="starting_row" value="1"/>
        <parameter key="parse_numbers" value="true"/>
        <parameter key="decimal_character" value="."/>
        <parameter key="grouped_digits" value="false"/>
        <parameter key="grouping_character" value=","/>
        <parameter key="infinity_representation" value=""/>
        <parameter key="date_format" value=""/>
        <parameter key="first_row_as_names" value="true"/>
        <list key="annotations">
          <parameter key="0" value="Name"/>
        </list>
        <parameter key="time_zone" value="SYSTEM"/>
        <parameter key="locale" value="English (United States)"/>
        <parameter key="encoding" value="windows-1252"/>
        <parameter key="read_all_values_as_polynominal" value="false"/>
        <list key="data_set_meta_data_information">
          <parameter key="0" value="exchanges.true.polynominal.attribute"/>
          <parameter key="1" value="orgs.true.polynominal.attribute"/>
          <parameter key="2" value="people.true.polynominal.attribute"/>
          <parameter key="3" value="places.true.polynominal.attribute"/>
          <parameter key="4" value="text.true.polynominal.attribute"/>
          <parameter key="5" value="title.true.polynominal.attribute"/>
          <parameter key="6" value="topics.true.polynominal.attribute"/>
          <parameter key="7" value="Category.true.polynominal.attribute"/>
          <parameter key="8" value="zahlen.true.polynominal.attribute"/>
          <parameter key="9" value="text_orig.true.polynominal.attribute"/>
        </list>
        <parameter key="read_not_matching_values_as_missings" value="false"/>
        <parameter key="datamanagement" value="double_array"/>
        <parameter key="data_management" value="auto"/>
      </operator>
      <operator activated="true" class="nominal_to_text" compatibility="9.2.001" expanded="true" height="82" name="Nominal to Text" width="90" x="246" y="34">
        <parameter key="attribute_filter_type" value="subset"/>
        <parameter key="attribute" value=""/>
        <parameter key="attributes" value="text"/>
        <parameter key="use_except_expression" value="false"/>
        <parameter key="value_type" value="nominal"/>
        <parameter key="use_value_type_exception" value="false"/>
        <parameter key="except_value_type" value="file_path"/>
        <parameter key="block_type" value="single_value"/>
        <parameter key="use_block_type_exception" value="false"/>
        <parameter key="except_block_type" value="single_value"/>
        <parameter key="invert_selection" value="false"/>
        <parameter key="include_special_attributes" value="true"/>
      </operator>
      <operator activated="true" class="generate_tfidf" compatibility="9.2.001" expanded="true" height="82" name="Generate TFIDF" width="90" x="380" y="34">
        <parameter key="calculate_term_frequencies" value="true"/>
      </operator>
      <operator activated="true" class="text:process_document_from_data" compatibility="8.1.000" expanded="true" height="82" name="Textfeatures" width="90" x="514" y="34">
        <parameter key="create_word_vector" value="true"/>
        <parameter key="vector_creation" value="TF-IDF"/>
        <parameter key="add_meta_information" value="true"/>
        <parameter key="keep_text" value="false"/>
        <parameter key="prune_method" value="percentual"/>
        <parameter key="prune_below_percent" value="0.0"/>
        <parameter key="prune_above_percent" value="0.4"/>
        <parameter key="prune_below_rank" value="0.001"/>
        <parameter key="prune_above_rank" value="0.3"/>
        <parameter key="datamanagement" value="double_sparse_array"/>
        <parameter key="data_management" value="auto"/>
        <parameter key="select_attributes_and_weights" value="false"/>
        <list key="specify_weights">
          <parameter key="text" value="1.0"/>
        </list>
        <process expanded="true">
          <operator activated="true" class="text:transform_cases" compatibility="8.1.000" expanded="true" height="68" name="Transform Cases" width="90" x="45" y="34">
            <parameter key="transform_to" value="lower case"/>
          </operator>
          <operator activated="true" class="text:filter_stopwords_english" compatibility="8.1.000" expanded="true" height="68" name="Filter Stopwords (English)" width="90" x="179" y="34"/>
          <operator activated="true" class="text:tokenize" compatibility="8.1.000" expanded="true" height="68" name="Tokenize" width="90" x="313" y="34">
            <parameter key="mode" value="non letters"/>
            <parameter key="characters" value=".:"/>
            <parameter key="language" value="English"/>
            <parameter key="max_token_length" value="3"/>
          </operator>
          <operator activated="true" class="text:stem_snowball" compatibility="8.1.000" expanded="true" height="68" name="Stem (Snowball)" width="90" x="447" y="34">
            <parameter key="language" value="English"/>
          </operator>
          <operator activated="true" class="text:filter_by_length" compatibility="8.1.000" expanded="true" height="68" name="Filter Tokens (by Length)" width="90" x="581" y="34">
            <parameter key="min_chars" value="3"/>
            <parameter key="max_chars" value="100"/>
          </operator>
          <connect 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="Tokenize" to_port="document"/>
          <connect from_op="Tokenize" 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="store" compatibility="9.2.001" expanded="true" height="68" name="Store" width="90" x="715" y="34">
        <parameter key="repository_entry" value="reut2"/>
      </operator>
      <connect from_op="Read CSV" 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="Generate TFIDF" to_port="example set input"/>
      <connect from_op="Generate TFIDF" from_port="example set output" to_op="Textfeatures" to_port="example set"/>
      <connect from_op="Textfeatures" from_port="example set" to_op="Store" to_port="input"/>
      <connect from_op="Store" from_port="through" 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>

Your prune settings are incorrect, when using percentual ensure you use a range like 0 to 80 or so. Now you prune everything above 0.4% while I assume you want 40% instead.

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