Document Vector

This node creates a document vector for each document representing it in the terms space. The values of the feature vectors can be specified as boolean values or as values of a specified column i.e. an tf*idf column. The dimension of the vectors will be the number of distinct terms in the BoW.

Options

Document column
The column containing the documents to use.
Ignore tags
If checked tags are ignored when comparing terms.
Bitvector
If checked a bitvector will be created indicating whether a certain term is contained in a document or not.
Vector value
If Bitvector setting is not checked it is possible to specify the column to use as feature vector values. The column can i.e. contain tf*idf values which are than used as values of the feature vector. Be aware that you have to compute these values before using this node. To do so i.e. the frequency calculation nodes can be used.
As collection cell
If checked all vector entries will be stored in a collection cell consisting of double cells. The cells are ordered, the ordering is specified in the data table spec. If not checked all double cells will be stored in corresponding columns. The advantage of the column representation is that most of the regular algorithms in KNIME can be applied. The disadvantage is (which is on the other hand the advantage of the collection representation) that processing of subsequent nodes will be slowed down, due to the many columns that will be created (dependent on the input data of course).

Input Ports

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The input table containing the bag of words.

Output Ports

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An output table containing the documents with the related document vectors.
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A model containing node settings as well as column names of the term feature space.

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Installation

To use this node in KNIME, install the extension KNIME Textprocessing from the below update site following our NodePit Product and Node Installation Guide:

v5.4

A zipped version of the software site can be downloaded here.

Plugin provider: KNIME AG, Zurich, Switzerland
Plugin version: 5.4.0.v202409110759
On NodePit since: 2024-12-06
Last update: 2024-12-17
KNIME versions: Since v3.6

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