Apologies, I mistaken apache-math as mahout-math and didn't know what
I'm talking about :)
On 13-08-12 07:08 PM, Ted Dunning wrote:
Yes. Apache Math linear algebra is very difficult for us to use because
their matrices are non-extensible.
But there is actually quite a lot of code to do with random distributions,
optimization and quadrature. Those are much more likely to be useful to us.
On Mon, Aug 12, 2013 at 3:26 PM, Dmitriy Lyubimov <[email protected]> wrote:
Larger part of mahout-math is linear algebra, which is currently broken for
sparse part of the equation and which we don't use at all.
One part of the problem is that our use for that library is always a fringe
case, and as far as i can tell, will always continue to be such.
Another part of the problem is that keeping dependency will invite
bypassing Mahout's solvers and, as a result, architecture inconsistency.
That said, I guess Ted's argument (which is mainly cost, as i gathered),
trumps the two above.
On Mon, Aug 12, 2013 at 3:20 PM, Peng Cheng <[email protected]> wrote:
seriously, I would prefer the dependency as a good architectural pattern.
It encourages other people to use/contribute to it to avoid repetitive
work.
On 13-08-12 06:16 PM, Ted Dunning wrote:
I am fine with it staying.
On Mon, Aug 12, 2013 at 3:14 PM, Dmitriy Lyubimov <[email protected]>
wrote:
So you are ok with apache-math dependency to stay?
On Mon, Aug 12, 2013 at 3:09 PM, Ted Dunning <[email protected]>
wrote:
So I checked on these. The non-trivial issues with replacing Commons
Math
include:
- Poisson and negative binomial distributions. This would be several
hours
work to write and test (we have Colt-inherited negative binomial
distribution, but it takes no longer to write a new one than to test
an
old
one).
- random number generators. This is about and hour or two of work to
pull
the MersenneTwister implementation into our code.
- next prime number finder. Not a big deal to replicate, but it would
take
a few hours to do.
- quadrature. We use an adaptive integration routine to check
distribution
properties. This, again, would take a few hours to replace.
I really don't see the benefit to this work.
On Mon, Aug 12, 2013 at 2:53 PM, Ted Dunning <[email protected]>
wrote:
2 distribution.**PoissonDistribution;
2 distribution.**PascalDistribution;
2 distribution.**NormalDistribution;
1 util.FastMath;
1 random.RandomGenerator;
1 random.MersenneTwister;
1 primes.Primes;
1 linear.RealMatrix;
1 linear.EigenDecomposition;
1 linear.Array2DRowRealMatrix;
1 distribution.RealDistribution;
1 distribution.**IntegerDistribution;
1 analysis.integration.**UnivariateIntegrator;
1 analysis.integration.**RombergIntegrator;
1 analysis.UnivariateFunction;
