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From "Suneel Marthi (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAHOUT-964) RowSimilarityJob should exit immediately if an invalid similarity measure specified and it would be nice to have an --overwrite option for the RowSimilarityJob CLI
Date Sat, 28 Jan 2012 16:05:12 GMT

     [ https://issues.apache.org/jira/browse/MAHOUT-964?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Suneel Marthi updated MAHOUT-964:
---------------------------------

    Status: Open  (was: Patch Available)
    
> RowSimilarityJob should exit immediately if an invalid similarity measure specified and
it would be nice to have an --overwrite option for the RowSimilarityJob CLI
> -------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: MAHOUT-964
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-964
>             Project: Mahout
>          Issue Type: Improvement
>          Components: Math
>    Affects Versions: 0.6
>         Environment: Mahout 0.6 snapshot from trunk
>            Reporter: Suneel Marthi
>         Attachments: Mahout-964.patch
>
>
> 1. If an invalid Similarity Measure has been specified as input to the RowSimilarityJob,
it presently throws a ClassCastException but still proceeds with executing all of the subsequent
tasks - VectorNormalizer, Cooccurrences Mapper and UnSymmetrify Mapper. We should exit the
process early without having to invoke all of the subsequent tasks (all of them fail anyways).
> 2. It would be nice to have an --overwrite option for the Command line interface which
would delete the temp and output paths at the beginning of RowSimilarityJob execution, similar
to what's being done in seq2sparse, seqdirectory. If I run RowSimilarityJob over and over
again with different similarity measures, I should not be forced to delete my temp and output
paths first prior to invoking the job.

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