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https://issues.apache.org/jira/browse/MATH-1371?focusedWorklogId=714862&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-714862
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ASF GitHub Bot logged work on MATH-1371:
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Author: ASF GitHub Bot
Created on: 25/Jan/22 16:53
Start Date: 25/Jan/22 16:53
Worklog Time Spent: 10m
Work Description: asfgit closed pull request #35:
URL: https://github.com/apache/commons-math/pull/35
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Issue Time Tracking
-------------------
Worklog Id: (was: 714862)
Time Spent: 20m (was: 10m)
> Provide accelerated kmeans++ implementation
> -------------------------------------------
>
> Key: MATH-1371
> URL: https://issues.apache.org/jira/browse/MATH-1371
> Project: Commons Math
> Issue Type: Improvement
> Reporter: Artem Barger
> Assignee: Artem Barger
> Priority: Major
> Fix For: 4.X
>
> Attachments: ElkanKmeansPlusPlusClusterer.java,
> ElkanKmeansPlusPlusClustererTest.java
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> There is an updated version of kmeans++ algorithm available, which is
> published in: Elkan, Charles. "Using the triangle inequality to accelerate
> k-means." ICML. Vol. 3. 2003. paper.
> The main essence is to boost the kmeans iterations by avoiding computation of
> distances between centers and points when there is no need for that. For
> example after the update cluster center haven't moved too far from the point
> therefore no change in point assignment. The accelerated algorithm avoids
> unnecessary distance calculations by applying the triangle inequality in two
> different ways, and by keeping track of lower and upper bounds for distances
> between points and centers.
> Algorithm description is available in the paper.
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