[Mosesdecoder-commits] SF.net SVN: mosesdecoder: [1217] trunk/moses/src

[<lex...@us...>]

Revision: 1217
          http://mosesdecoder.svn.sourceforge.net/mosesdecoder/?rev=1217&view=rev
Author:   lexi_birch
Date:     2007-02-16 07:56:44 -0800 (Fri, 16 Feb 2007)

Log Message:
-----------
Merging from branch. 
>From now on, can have multiple decoder step lists to accomodate backoff
Specify this as an extra parameter in the [mapping] option in the ini file
This is backwards compatible.
Before (and still accepted):
[mapping]
T 0

Now you can have:
[mapping]
0 T 0
1 T 1
1 G 0

Imagine for instance the translation table 0 is words - words, 
and the table 1 is stems - stems, and the generation table 0
is stems - words. This will allow us to backoff to stems if
words are not found.

It is not really backoff because all the options from both
decoder step lists get included into the translation option collection,
which is then used to create the hypotheses.
The different paths must have their weights carefully balanced.
MERT might not be enough to discover the best weights for all the
combined parameters. 

Modified Paths:
--------------
    trunk/moses/src/Manager.cpp
    trunk/moses/src/StaticData.cpp
    trunk/moses/src/StaticData.h
    trunk/moses/src/TranslationOptionCollection.cpp
    trunk/moses/src/TranslationOptionCollection.h


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