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Posted to issues@solr.apache.org by "Cassandra Targett (Jira)" <ji...@apache.org> on 2021/08/14 03:51:00 UTC
[jira] [Updated] (SOLR-10685) Add Fast Cosine Transform and Inverse
Fast Cosine Transform Stream Evaluators
[ https://issues.apache.org/jira/browse/SOLR-10685?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Cassandra Targett updated SOLR-10685:
-------------------------------------
Component/s: streaming expressions
> Add Fast Cosine Transform and Inverse Fast Cosine Transform Stream Evaluators
> -----------------------------------------------------------------------------
>
> Key: SOLR-10685
> URL: https://issues.apache.org/jira/browse/SOLR-10685
> Project: Solr
> Issue Type: New Feature
> Components: streaming expressions
> Reporter: Joel Bernstein
> Assignee: Joel Bernstein
> Priority: Major
> Fix For: 8.1, main (9.0)
>
> Attachments: SOLR-10685.patch
>
>
> The fast cosine transform Stream Evaluator can be used to smooth non-stationary time series data.
> Syntax:
> fast cosine transform:
> {code}
> a = fct(colA)
> {code}
> Inverse fast cosine transform:
> {code}
> a = fcti(colA)
> {code}
> FCT implementation provided by Apache Commons Math.
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