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Posted to dev@mahout.apache.org by "Suneel Marthi (JIRA)" <ji...@apache.org> on 2013/06/15 05:56:20 UTC

[jira] [Assigned] (MAHOUT-1263) Serialise/Deserialise Lambda value for OnlineLogisticRegression

     [ https://issues.apache.org/jira/browse/MAHOUT-1263?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Suneel Marthi reassigned MAHOUT-1263:
-------------------------------------

    Assignee: Suneel Marthi
    
> Serialise/Deserialise Lambda value for OnlineLogisticRegression 
> ----------------------------------------------------------------
>
>                 Key: MAHOUT-1263
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1263
>             Project: Mahout
>          Issue Type: Bug
>          Components: Classification
>    Affects Versions: 0.7
>            Reporter: Mike Davy
>            Assignee: Suneel Marthi
>              Labels: patch
>         Attachments: MAHOUT-1263.patch
>
>   Original Estimate: 0.5h
>  Remaining Estimate: 0.5h
>
> The value for Lambda in OnlineLogisticRegression seems not the be serialised/deserialised correctly. 
> If I train a model with a specific lambda value, serialise it, then read it back in, the value of Lambda goes back to the default value (1.0e-5). 
> I've created a patch that adds the lambda value into the write/readFields (org.apache.hadoop.io.Writable). Patch includes a unit test that checks the values after serialising/deserialising to/from a ByteArray. 
> I think this is correct, unless I'm missing something obvious?
> Note: this patch is not backwards compatible - can easily adapt to be more backwards compatible if required. 

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