MDS Projection

This Node Is Deprecated — This version of the node has been replaced with a new and improved version. The old version is kept for backwards-compatibility, but for all new workflows we suggest to use the version linked below.
Go to Suggested ReplacementMDS Projection

This node maps data of a high dimensional space onto a lower (usually 2 or 3) dimensional space with respect to a set of fixed data points. Therefore modified Sammons mapping is applied, which iteratively decreases the difference of the distances of high and low dimensional data. When adjusting the position a low dimensional data point by default not its neighbors (or all other data points) are taken into account but a specified set of fixed data points which are not modified. Additionally the data points (and not only the fixed points) can be taken into account when adjusting its positions, therefore the setting "Project only" has to be unchecked. If the setting is checked the data points will be mapped only with respect to the fixed data, which we call a projection. The algorithm converges like a common mds algorithm due to a decreasing learning rate.


Number of rows to use
Specifies the number of rows to apply the MDS on.
Output dimension
Specifies the dimension of the mapped output data.
Specifies the number of epochs to train.
Learn rate
Specifies the learning rate to use. The learning rate is decreased automatically over the trained epochs.
Random seed
Specifies the random seed to use, which allows to reproduce a mapping even if the initialization is done randomly.
Distance metric
The distance metric to use Euclidean or Manhattan. The Euclidean distance metric is used by default.
Project only
If checked the input data is mapped only with respect to the specified fixed data points (see tab 'Fixed data'). If unchecked, the other (not fixed) data points are taken into account too, when adjusting the position of each single data point.
Input data
Specifies the columns to use by the mapping.
Fixed data
Specifies the columns to use as fixed data. Be aware that the chosen columns represent the lower dimensional data which is used to project the input data at. The number of columns to choose has to be equal to the value set for output dimension.

Input Ports

Data table containing the fixed data points.
Data table containing the data to map.

Output Ports

The input data and the mapped data.

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