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Posted to issues@commons.apache.org by "Gilles Sadowski (Jira)" <ji...@apache.org> on 2021/06/12 22:55:00 UTC
[jira] [Updated] (MATH-1370) Increase efficiency of
EnumeratedDistribution#probability
[ https://issues.apache.org/jira/browse/MATH-1370?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Gilles Sadowski updated MATH-1370:
----------------------------------
Fix Version/s: (was: 4.0)
4.X
> Increase efficiency of EnumeratedDistribution#probability
> ---------------------------------------------------------
>
> Key: MATH-1370
> URL: https://issues.apache.org/jira/browse/MATH-1370
> Project: Commons Math
> Issue Type: Improvement
> Reporter: Ryan Gaffney
> Priority: Minor
> Labels: patch, performance
> Fix For: 4.X
>
> Attachments: enum-distribution-perf-patch, enum-distribution-perf-patch.2
>
>
> There are lots of other low hanging fruit in the distribution package but unfortunately this is the only one I got to that day.
> In the EnumeratedDistribution case, the probability() method is currently O(N) where N denotes number of random variables, even though the random variables are fixed / known. This change makes probability() O(1). The unlikely worst case scenario now consumes slightly more than 2x the memory, but I do not think this would be an issue in the vast majority of cases.
> Original PR (incorrectly against master) [here|https://github.com/apache/commons-math/pull/34].
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