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https://issues.apache.org/jira/browse/MAHOUT-300?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12836706#action_12836706
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Jake Mannix commented on MAHOUT-300:
------------------------------------
The sparse data is odd... (-vs 500000 -sp 5000) (running with 1000, 300 is
really not very sparse at all...)
I haven't applied any newer patches (just the one I submitted most recently),
but I have svn upped.
These results are counterintuitve.
{code}
BenchMarks DenseVector
RandomAccessSparseVector SequentialAccessSparseVector
Dense.dot(RandomAccess) Dense.dot(SequentialAccess)
RandomAcces.dot(Dense)
RandomAccess.dot(SequentialAccess)SequentialAccess.dot(Dense)
SequentialAccess.dot(RandomAccess)
DotProduct
nCalls = 2500; nCalls = 2500;
nCalls = 2500; nCalls = 2500; nCalls =
2500; nCalls = 2500; nCalls = 2500;
nCalls = 2500; nCalls = 2500;
sumTime = 3.660321s; sumTime =
1.481516s; sumTime = 0.448737s; sumTime = 2.098937s;
sumTime = 0.856259s; sumTime = 2.277742s; sumTime =
0.607507s; sumTime = 1.341608s; sumTime = 0.741622s;
minTime = 1.31ms; minTime = 0.459ms;
minTime = 0.102ms; minTime = 0.716ms; minTime =
0.24ms; minTime = 0.776ms; minTime = 0.18ms;
minTime = 0.442ms; minTime = 0.209ms;
maxTime = 10.149ms; maxTime = 36.691ms;
maxTime = 4.552ms; maxTime = 5.437ms; maxTime =
11.856ms; maxTime = 8.059ms; maxTime = 4.509ms;
maxTime = 2.136ms; maxTime = 2.031ms;
meanTime = 1.464128ms; meanTime =
0.592606ms; meanTime = 0.179494ms; meanTime = 0.839574ms;
meanTime = 0.342503ms; meanTime = 0.911096ms; meanTime =
0.243002ms; meanTime = 0.536643ms; meanTime = 0.296648ms;
stdDevTime = 0.329025ms; stdDevTime =
0.852156ms; stdDevTime = 0.234261ms; stdDevTime = 0.179854ms;
stdDevTime = 0.286798ms; stdDevTime = 0.268853ms; stdDevTime =
0.115022ms; stdDevTime = 0.171088ms; stdDevTime = 0.115263ms;
Speed = 683.0002 /sec Speed = 1687.4606
/sec Speed = 5571.192 /sec Speed = 1191.0791 /sec Speed =
2919.6772 /sec Speed = 1097.5781 /sec Speed = 4115.1787 /sec
Speed = 1863.4355 /sec Speed = 3370.9895 /sec
Rate = 4098.001 MB/s Rate = 10124.764
MB/s Rate = 33427.152 MB/s Rate = 7146.4746 MB/s Rate =
17518.062 MB/s Rate = 6585.4688 MB/s Rate = 24691.072 MB/s
Rate = 11180.613 MB/s Rate = 20225.936 MB/s
{code}
> Solve performance issues with Vector Implementations
> ----------------------------------------------------
>
> Key: MAHOUT-300
> URL: https://issues.apache.org/jira/browse/MAHOUT-300
> Project: Mahout
> Issue Type: Improvement
> Affects Versions: 0.3
> Reporter: Robin Anil
> Fix For: 0.3
>
> Attachments: MAHOUT-300.patch, MAHOUT-300.patch, MAHOUT-300.patch,
> MAHOUT-300.patch, MAHOUT-300.patch, MAHOUT-300.patch, MAHOUT-300.patch,
> MAHOUT-300.patch, MAHOUT-300.patch
>
>
> AbstractVector operations like times
> public Vector times(double x) {
> Vector result = clone();
> Iterator<Element> iter = iterateNonZero();
> while (iter.hasNext()) {
> Element element = iter.next();
> int index = element.index();
> result.setQuick(index, element.get() * x);
> }
> return result;
> }
> should be implemented as follows
> public Vector times(double x) {
> Vector result = clone();
> Iterator<Element> iter = result.iterateNonZero();
> while (iter.hasNext()) {
> Element element = iter.next();
> element.set(element.get() * x);
> }
> return result;
> }
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