Knowledge Discovery 25.1
Knowledge Discovery Expert

# Troubleshoot Clusters from Snapshots

Consider the following factors when you have poor results, or when clusters are not produced.

- Clustering uses document `Suggest` actions. Ensure that the documents in the initial snapshot query contain source fields, which are used to suggest related documents.

- If your log files indicate that the snapshot did not produce enough seeds, try reducing the `SeedSize` and `SeedBindLevel` configuration parameters to create more seeds.

- If the Category component does not extract any clusters, or extracts fewer clusters than expected, try reducing the `BindLevel` and `Equivalence` configuration parameters, which determine how seeds are merged. In addition, you can improve the snapshot by reducing the `SeedSize` and `SeedBindLevel` parameters. This produces more seeds, and then hopefully more clusters. OpenText recommends that if you experience any problems with cluster extraction, you should focus on improving the snapshot.

- The `MinClusterDocs` parameter determines the minimum number of documents that a cluster must have; clusters with fewer documents are discarded. If your log files show that enough seeds have been generated, but clustering does not produce enough clusters, try reducing this parameter, either in the `ClusterCluster` action or the configuration file.

- Avoid setting clustering parameters to zero. This can result in unusual or unexpected behavior. To switch off certain settings (for example `Equivalence` and `BindLevel`), set the parameter to `-1`, to use internal defaults.

- Ensure that the initial query is not too restrictive. If the snapshot query only returns a few results, clustering might not work properly. By default, the query selects 5,000 documents at random from the index, which is usually sufficient to detect trends.

- Category uses the `RandomSeed` configuration parameter to select documents at random from the query result set. During troubleshooting, set a value for this parameter to ensure that Category uses the same documents from the query set each time.

Copyright 2024 Open Text
Version 25.1 | Last updated January 2025

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Product: Knowledge Discovery 25.1

Topic Title: Troubleshoot Clusters from Snapshots