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https://issues.apache.org/jira/browse/IGNITE-7022?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16289311#comment-16289311
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Aleksey Zinoviev commented on IGNITE-7022:
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Please, see QuadTree usage in FlinkML
https://github.com/apache/flink/blob/master/flink-libraries/flink-ml/src/main/scala/org/apache/flink/ml/nn/KNN.scala
> Use QuadTree for kNN performance
> --------------------------------
>
> Key: IGNITE-7022
> URL: https://issues.apache.org/jira/browse/IGNITE-7022
> Project: Ignite
> Issue Type: Improvement
> Components: ml
> Reporter: Aleksey Zinoviev
> Assignee: Aleksey Zinoviev
> Priority: Minor
>
> Now, kNN implementation is not too fast. Its performance could be increased
> with [https://en.wikipedia.org/wiki/Quadtree]
> Also, benchmarks should be provided too
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