[ http://issues.apache.org/jira/browse/NUTCH-134?page=all ]
Jerome Charron resolved NUTCH-134:
----------------------------------
Fix Version: 0.8-dev
Resolution: Fixed
Assign To: Jerome Charron
Solution proposed by Andrzej implemented.
> Summarizer doesn't select the best snippets
> -------------------------------------------
>
> Key: NUTCH-134
> URL: http://issues.apache.org/jira/browse/NUTCH-134
> Project: Nutch
> Type: Bug
> Components: searcher
> Versions: 0.7, 0.8-dev, 0.7.1, 0.7.2
> Reporter: Andrzej Bialecki
> Assignee: Jerome Charron
> Fix For: 0.8-dev
> Attachments: summarizer.060506.patch
>
> Summarizer.java tries to select the best fragments from the input text, where
> the frequency of query terms is the highest. However, the logic in line 223
> is flawed in that the excerptSet.add() operation will add new excerpts only
> if they are not already present - the test is performed using the Comparator
> that compares only the numUniqueTokens. This means that if there are two or
> more excerpts, which score equally high, only the first of them will be
> retained, and the rest of equally-scoring excerpts will be discarded, in
> favor of other excerpts (possibly lower scoring).
> To fix this the Set should be replaced with a List + a sort operation. To
> keep the relative position of excerpts in the original order the Excerpt
> class should be extended with an "int order" field, and the collected
> excerpts should be sorted in that order prior to adding them to the summary.
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