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From "Sean Owen (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAHOUT-580) Missing basePath in Bayes job / InMemoryDataStore
Date Mon, 10 Jan 2011 19:48:46 GMT
Missing basePath in Bayes job / InMemoryDataStore
-------------------------------------------------

                 Key: MAHOUT-580
                 URL: https://issues.apache.org/jira/browse/MAHOUT-580
             Project: Mahout
          Issue Type: Bug
          Components: Classification
    Affects Versions: 0.4
            Reporter: Sean Owen
            Assignee: Robin Anil
             Fix For: 0.5


Reported on user@ by Pierre Mage:

I found the following issue in the trunk: If the dataSource option is "hdfs"
in org.apache.mahout.classifier.
Classify, there is a problem with InMemoryBayesDatastore because its
basePath param is not defined :
To fix it, I edited Classify like this:
122.  if ("hdfs".equals(dataSource)) {
123.    params.set("basePath", modelBasePath);

Yes, looks like InMemoryDataStore expects this to be set -- so does HBaseDataStore. But that
takes the base path (table) separately as a param. And InMemoryDataStore doesn't take it at
all. I adjusted this since it seems correct. And then tried to centralized handling of Bayes
params in BayesParameters since it seems to get half processed in this class only.

I have attached my own rather more elaborate patch that reflects this.

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