[
https://issues.apache.org/jira/browse/MAHOUT-165?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12745415#action_12745415
]
Grant Ingersoll edited comment on MAHOUT-165 at 8/20/09 5:05 AM:
-----------------------------------------------------------------
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.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
