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https://issues.apache.org/jira/browse/MAHOUT-468?focusedWorklogId=943847&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-943847
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ASF GitHub Bot logged work on MAHOUT-468:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 14/Nov/24 22:10
Start Date: 14/Nov/24 22:10
Worklog Time Spent: 10m
Work Description: andrewmusselman merged PR #472:
URL: https://github.com/apache/mahout/pull/472
Issue Time Tracking
-------------------
Worklog Id: (was: 943847)
Time Spent: 1.5h (was: 1h 20m)
> Performance of RowSimilarityJob is not good
> -------------------------------------------
>
> Key: MAHOUT-468
> URL: https://issues.apache.org/jira/browse/MAHOUT-468
> Project: Mahout
> Issue Type: Test
> Affects Versions: 0.4
> Reporter: Han Hui Wen
> Priority: Major
> Attachments:
> RowSimilarityJob-CooccurrencesMapper-SimilarityReducer.jpg
>
> Time Spent: 1.5h
> Remaining Estimate: 0h
>
> I have done a test ,
> Preferences records: 680,194
> distinct users: 23,246
> distinct items:437,569
> SIMILARITY_CLASS_NAME=SIMILARITY_COOCCURRENCE
> maybePruneItemUserMatrixPath:16.50M
> weights:13.80M
> pairwiseSimilarity:18.81G
> Job RowSimilarityJob-RowWeightMapper-WeightedOccurrencesPerColumnReducer:used
> 32 sec
> Job RowSimilarityJob-CooccurrencesMapper-SimilarityReducer:used 4.30 hours
> I think the reason may be following:
> 1) We used SequenceFileOutputFormat,it cause job can only be run by n ( n=
> Hadoop node counts ) mappers or reducers concurrently.
> 2) We stored redundant info.
> for example :
> the output of CooccurrencesMapper:
> (ItemIndexA,similarity),(ItemIndexA,ItemIndexB,similarity)
> 3) Some frequently used code
> https://issues.apache.org/jira/browse/MAHOUT-467
> 4) allocate many local variable in loop (need confirm )
> In Class DistributedUncenteredZeroAssumingCosineVectorSimilarity
> @Override
> public double weight(Vector v) {
> double length = 0.0;
> Iterator<Element> elemIterator = v.iterateNonZero();
> while (elemIterator.hasNext()) {
> double value = elemIterator.next().get(); //this one
> length += value * value;
> }
> return Math.sqrt(length);
> }
> 5) Maybe we need control the size of cooccurrences
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