Hi Ayah,
there isn't a lot of documentation for GHKM support in Moses, but I'd recommend
taking a look at the following:
1. The extract-ghkm help message, which you can view by running
"/path/to/moses/bin/extract-ghkm -h". This describes the program's options.
2. The following WMT12 system description paper provides some implementation
details as well as a description of Edinburgh's GHKM-based English-to-German
string-to-tree system:
http://www.aclweb.org/anthology/W/W12/W12-3150.pdf
3. Rico Sennrich has made available the EMS config and various scripts used to
build Edinburgh's 2014 and 2015 English-to-German string-to-tree systems. See
his Git repository here:
https://github.com/rsennrich/wmt2014-scripts
Whether you will see better or worse BLEU scores depends on exactly what you're
comparing it to. If you are currently using Moses' extract-rules program to
extract rules with syntactic annotation (on either the source or target side)
then there is a good chance you will get better results with GHKM.
The main changes since 2.1 are support for soft source-syntactic constraints --
see the following paper for details:
http://www.aclweb.org/old_anthology/W/W14/W14-4018.pdf
and support for extraction of tree-to-string STSG rules. Moses 2.1 is quite
old now, so it's probably worth upgrading anyway. Either to Moses 3 or to the
latest GitHub. The GitHub code contains a lot of improvements since version 3.
It's pretty stable and if you do find a problem then report it here and it
will probably be fixed quickly.
Phil
> On 29 Feb 2016, at 18:10, Ayah ElMaghraby <[email protected]> wrote:
>
> Hello,
> I am still using moses 2.1 but I am intrigued about GHKM algorithm support in
> 2.1. I can’t find any documentation for it yet but I can see it is
> implemented.
> Shall I use it should I expect worse BLEU scores for language like Arabic
> than default extraction algorithm?
> Shall I upgrade to Moses 3 for better implementation of GHKM?
>
> Regards,
> Ayah ElMaghraby
>
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