[eigen] Re: [Bf-committers] How about adding boost uBLAS library to blender/extern?

[Keir Mierle <mierle@xxxxxxxxx>]

On Tue, Jan 27, 2009 at 7:02 AM, Shaul Kedem <shaul.kedem@xxxxxxxxx> wrote:
> Thank you for the info benoit.
>
> Can you please ask him how he debug the template on each platform?

Usually GDB. However, as a user of Eigen for libmv, I find the
debugger / eigen issue is irrelevant because the bugs are all in my
code, not Eigen. If anything, your code is more likely to work with
Eigen after compiling (compared to C matrix libraries) because the
types have much more information about the computations and will
refuse to compile nonsensical expressions.

Switching to Eigen decreased the rate at which I add bugs to libmv.

> what is his main dev platform?

Linux.

Keir

>
>
>
> On Tue, Jan 27, 2009 at 4:09 AM, Benoit Bolsee <benoit.bolsee@xxxxxxxxx> wrote:
>> Regarding Eigen2, I received additional explanations from the main
>> developper Benoit Jacob. It shows a nice commitment to future
>> improvements:
>>
>>> it has automatic SIMD and cache friendly optimization
>>
>> Yup indeed :)
>>
>>> it provides out of the box SVD decomposition
>>
>> Indeed. The current SVD code, in Eigen 2.0, is taken from the public
>> domain JAMA. It's decent but not a killer. My top priority right now is
>> to get a much more SVD, written from scratch, in Eigen 2.1. In
>> particular it will be extremely stable numerically, it should have
>> efficient fixed-size specializations, and it should of course take full
>> advantage of the Eigen framework. My motivation is that this is one of
>> the most asked-for features.
>>
>> Eigen 2.0 will be released next week. Eigen 2.1 will be used heavily by
>> KDE 4.3 so has to be released around June or July.
>>
>>>MSVC 2005 and up (MSVC 2008 for SSE
>>>optimization), gcc 3.3 and up (gcc 4 for SIMD optimization), recent ICC
>>
>>>(9? 10?, 11?).
>>
>> GCC 4.2 for SIMD. For ICC, I don't know exactly because it's not me who
>> tested it. There were at least successful reports with ICC 10.
>>
>>> However, current version is beta6,
>>
>> Yep, final release next week.
>>
>>>API is stable for dense matrices
>>
>> Mostly. In Eigen 2.0 we marked many parts as experimental to retain some
>> freedom, although we will ensure 99.9% compatibility for our important
>> users. If Blender uses Eigen we will work with you to minimize trouble.
>> Our goal is to shed the experimentalness and extend the API stability
>> guarantee to much more of Eigen for the 2.1 release around June.
>>
>>>it is already used by many projects
>>
>> Indeed new projects switch every week.
>>
>>> and available as a package in various
>>>Linux distributions.
>>
>> Indeed, mostly thanks to KDE and KOffice depending on it.
>>
>>
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