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https://issues.apache.org/jira/browse/JOSHUA-284?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matt Post resolved JOSHUA-284.
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Resolution: Fixed
> Phrase-based decoding changes
> -----------------------------
>
> Key: JOSHUA-284
> URL: https://issues.apache.org/jira/browse/JOSHUA-284
> Project: Joshua
> Issue Type: Bug
> Reporter: Matt Post
> Assignee: Matt Post
> Fix For: 6.1
>
>
> Joshua's phrase-based decoding creates a lot of complications in the pipeline.
> Currently, phrase-based rules are simply left-branching Hiero rules. This
> means that, prior to packing or loading, rules have to have a nonterminal
> prepended to them. For example, Thrax will extract
> [X] ||| yo quiero ||| i want ||| ...
> This has to be changed to
> [X] ||| [X,1] yo quiero ||| [X,1] yo quiero ||| ...
> This means, for one, that phrase tables share a format but are specific to
> either the hiero or phrase-based decoder.
> Another problem is that the alignments have to be adjusted when packing
> grammars from Moses or Thrax format, since a symbol is being added.
> Basically, this choice introduces a host of incompatibilities that require
> special handling.
> A better idea would be to change the phrase-based decoder a bit so that,
> instead of using left-branching phrase rules, it made use of proper glue
> rules, the same way Hiero does. The advantages are:
> - both formalisms would use the same format
> - both formalisms would have a glue grammar
> - there should be no impact in running time
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