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Fuzzy c-Means

KNIME Base Nodes version 4.3.0.v202012031743 by KNIME AG, Zurich, Switzerland

The fuzzy c-means algorithm is a well-known unsupervised learning technique that can be used to reveal the underlying structure of the data. Fuzzy clustering allows each data point to belong to several clusters, with a degree of membership to each one.
Make sure that the input data is normalized to obtain better clustering results.
The list of attributes to use can be set in the second tab of the dialog.
The first output datatable provides the original datatable with the cluster memberships to each cluster. The second datatable provides the values of the cluster prototypes.
Additionally, it is possible to induce a noise cluster, to detect noise in the dataset, based on the approach from R. N. Dave: 'Characterization and detection of noise in clustering'.

Options

Number of clusters: Number of clusters to use for the algorithm.
Maximum number of iterations: This is the maximum number of iterations to be performed.
Fuzzifier: Indicates how much the clusters are allowed to overlap.
Use seed for random initialization: If this checkbox is set, a seed can be set for initializing the cluster prototypes.
Induce noise cluster: Whether to induce a noise cluster or not.
Set delta: Delta is the fixed distance from every datapoint to the noise cluster.
Set delta automatically, specify lambda: Delta is updated in each iteration, based on the average interpoint distances. However, a lambda paramater has to be set, according to the shape of the clusters.
Perform the clustering in memory: If this option is selected, the clustering is performed in the memory, which speeds up the process.
Compute cluster quality measures: Whether to calculate quality measures for the clustering. This can be time and memory consuming with large datasets.

Input Ports

: Datatable with training data. Make sure that the data are normalized!

Output Ports

: Input table extended by cluster membership
: Cluster centers

Views

Statistics View: Shows the WithinClusterVariation and the BetweenClusterVariation, which are indicators for 'good' clustering.

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Workflows

Extract Fuzzy Clusters (KNIME Hub)
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Installation

To use this node in KNIME, install KNIME Base nodes from the following update site:

KNIME 4.3

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

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