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Grant Ingersoll edited comment on MAHOUT-165 at 8/20/09 5:05 AM:
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http://acs.lbl.gov/~hoschek/colt-download/releases/license.html
The clause for military use in HEP is unacceptable, unfortunately. There is no way we could
enforce that. If we could use Colt w/o HEP, then we could use Colt. Perhaps there is just
a class or two from Colt that is ASL licensed that we can copy over and properly attribute
and that doesn't have any dependencies on HEP?
was (Author: gsingers):
http://acs.lbl.gov/~hoschek/colt-download/releases/license.html
The clause for military use in HEP is unacceptable, unfortunately. There is no way we could
enforce that. If we could use Colt w/o HEP, then we could use Colt. Perhaps there is just
a class or two from Colt that is ASL licensed that we can copy over and properly attribute?
> Using better primitives hash for sparse vector for performance gains
> --------------------------------------------------------------------
>
> Key: MAHOUT-165
> URL: https://issues.apache.org/jira/browse/MAHOUT-165
> Project: Mahout
> Issue Type: Improvement
> Components: Matrix
> Affects Versions: 0.2
> Reporter: Shashikant Kore
> Fix For: 0.2
>
> Attachments: mahout-165.patch
>
>
> In SparseVector, we need primitives hash map for index and values. The present implementation
of this hash map is not as efficient as some of the other implementations in non-Apache projects.
> In an experiment, I found that, for get/set operations, the primitive hash of Colt performance
an order of magnitude better than OrderedIntDoubleMapping. For iteration it is 2x slower,
though.
> Using Colt in Sparsevector improved performance of canopy generation. For an experimental
dataset, the current implementation takes 50 minutes. Using Colt, reduces this duration to
19-20 minutes. That's 60% reduction in the delay.
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