Document Vector Applier

This node creates a document vector for each document representing it in the terms space, exactly as the normal document vector node. The difference is that this node takes one data table and one Document Vector model as input:
1. Document Vector model containing names of feature space columns and node settings
2. Table containing the bag-of-words terms

The terms from the first input will be converted into document vectors using the vector from the second input as the reference. Features that appear in first table, but not in the model input will be filtered out, and features that appear in model input, but not in the first table will be added to the output vector and their values will be set to 0.

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.


Document column
The column containing the documents to use.
Use settings from model
If checked, settings contained in the input model will be used. Note: The settings contained in the input model will node change settings in the node dialog.
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).
Feature Column Selection
Selects all feature column names from the model input that should appear in the output document vector.

Input Ports

The input model containing the node settings and column names of the term feature space.
The input table containing the bag of words.

Output Ports

An output table containing the documents with the corresponding document vectors, whose terms are identical to the ones in the model.


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