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From "Gilles (JIRA)" <>
Subject [jira] [Commented] (MATH-817) Multivariate Normal Mixture Model Fitting by Expectation Maximization
Date Thu, 21 Mar 2013 16:17:16 GMT


Gilles commented on MATH-817:


Please never mix formatting changes of existing source files together with code modifications.
This is what you patch does for the file
"MixtureMultivariateRealDistribution". Moreover, in this case, the formatting changes were
for the worse.
I've manually corrected a lot of the formatting strangeness (but I've not run it through Checkstyle

More importantly, you've added "equals" and "hashCode" to "MixtureMultivariateRealDistribution",
but "equals" defer further checks to a List<T> which itself will defer to the elements;
but those elements (distribution instances) are not required to define "equals": thus the
top-level "equals" is redefined to allow different instances to be equal but relies on a low-level
"equals" that require instance equality.
However it seems only required to perform comparisons in some of the unit tests. If so, it
would be much better to explicitly check what is required for the test to pass.
I'm going to commit the code but without "equals"; thus I'm setting the now failing test to
"@Ignore". Please check out the test file and see whether what I've outlined is workable.

> Multivariate Normal Mixture Model Fitting by Expectation Maximization
> ---------------------------------------------------------------------
>                 Key: MATH-817
>                 URL:
>             Project: Commons Math
>          Issue Type: New Feature
>            Reporter: Jared Becksfort
>            Priority: Minor
>         Attachments: math_817.patch,,
>   Original Estimate: 1m
>  Remaining Estimate: 1m
> I will submit a class for fitting Multivariate Normal Mixture Models using Expectation
> > Hello,
> >
> > I have implemented some classes for multivariate Normal distributions, multivariate
normal mixture models, and an expectation maximization fitting class for the mixture model.
 I would like to submit it to Apache Commons Math.  I still have some touching up to do so
that they fit the style guidelines and implement the correct interfaces.  Before I do so,
I thought I would at least ask if the developers of the project are interested in me submitting
> >
> > Thanks,
> > Jared Becksfort
> Dear Jared,
> Yes, that would be very nice to have such an addition! Remember to also include unit
tests (refer to the current ones for examples). The best would be to split a submission up
into multiple minor ones, each covering a natural submission (e.g. multivariate Normal distribution
in one submission), and create an issue as described at
> If you run into any problems, please do not hesitate to ask on this mailing list.
> Cheers, Mikkel.

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