Moses-support Digest, Vol 97, Issue 4

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Today's Topics:

1. Re: Tokenization issue (Ihab Ramadan)
2. Re: Incremental training (Raj Dabre)


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Message: 1
Date: Tue, 4 Nov 2014 11:27:32 +0200
From: "Ihab Ramadan" <i.ramadan@saudisoft.com>
Subject: Re: [Moses-support] Tokenization issue
To: "'Hieu Hoang'" <Hieu.Hoang@ed.ac.uk>
Cc: 'moses-support' <moses-support@mit.edu>
Message-ID: <00aa01cff811$91709240$b451b6c0$@saudisoft.com>
Content-Type: text/plain; charset="utf-8"

Thank Hieu

Sure if made a nonbreaking_prefix file for Arabic language I will share it





From: hieuhoang@gmail.com [mailto:hieuhoang@gmail.com] On Behalf Of Hieu Hoang
Sent: Monday, November 3, 2014 8:18 PM
To: i.ramadan@saudisoft.com
Cc: moses-support
Subject: Re: [Moses-support] Tokenization issue



hi ihab

at it's most basic, tokenization separates punctuations from words. However, it can also be used to separate a word into it's morphemes to make it easier to process.

Moses doesn't include a very good Arabic tokeniser. Each language needs a nonbreaking_prefix file, located in
scripts/share/nonbreaking_prefixes

This doesn't exist for arabic, so the tokenizer uses the English file instead.

If you create a nonbreaking_prefixes for arabic, please share it with us. Or use a tool like MADA to tokenizer your arabic data



On 28 October 2014 14:40, Ihab Ramadan <i.ramadan@saudisoft.com> wrote:

Dears,

I have misunderstanding on what tokenization really do

What I think that It makes the translation of text like translated text gives the same output as ?translated? text or translated.text or translated text . which ignores any punctuations in the translated text

Am I right ?

I did the tokenization on my data but this is not happening

Note : in the tokenizer script I should feed it with the language and it could not recognize the arabic language (ar) which is my target language



Best Regards

Ihab Ramadan| Senior Developer| <http://www.saudisoft.com/> Saudisoft - Egypt | Tel +2 02 330 320 37 Ext- 0 | Mob+201007570826 <tel:%2B201007570826> | Fax+20233032036 <tel:%2B20233032036> | Follow us on <http://www.linkedin.com/company/77017?trk=vsrp_companies_res_name&trkInfo=VSRPsearchId%3A1489659901402995947155%2CVSRPtargetId%3A77017%2CVSRPcmpt%3Aprimary> linked | <https://www.facebook.com/pages/Saudisoft-Co-Ltd/289968997768973?ref_type=bookmark> ZA102637861 | <https://twitter.com/Saudisoft> ZA102637858




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--

Hieu Hoang
Research Associate
University of Edinburgh
http://www.hoang.co.uk/hieu

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Message: 2
Date: Tue, 4 Nov 2014 19:05:33 +0900
From: Raj Dabre <prajdabre@gmail.com>
Subject: Re: [Moses-support] Incremental training
To: i.ramadan@saudisoft.com
Cc: moses-support@mit.edu
Message-ID:
<CAB3gfjB=Y+Ta4KApWE2c68XPcMdyFGz_psz_z5v29=8Yahxf6g@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

Dear Ihab,

Perhaps I should have mentioned much more clearly what my script does.
Sorry for that.

Let me start with this: There is no direct/easy way to generate the
moses.ini file as you need.

1. Suppose you have 2 million lines of parallel corpora and you trained a
SMT system for it. This naturally gives the phrase table, reordering table
and moses.ini.
2. Suppose you got 500 k more lines of parallel corpora.... there are 2
ways:
a. Retrain 2.5 million lines from scratch (will take lots of time: ~
2-3 days on a regular machines)
b. Train on only the 500k new lines using the alignment information of
the original training data. (Faster: ~ 6-7 hours).


What my scripts do: *THEY ONLY GENERATE ALIGNMENTS and NOT PHRASE TABLES.*

1. full_train.sh -------------- This trains on the original corpus of 2
million lines. (Generate alignment files only for the original corpus)
2. align_new.sh -------------- This trains on the new corpus of 500 k
lines. (Generate alignment files only for the new corpus using the
alignments for 1)

*Why this split ????* Because the basic training step of Moses does not
preserve the alignment probability information. Only the alignments are
saved. To continue training we need the probability information.
You can pass flags to moses to preserve this information ( this flag is
--giza-option . If you do this then you will not need full_train.sh. But
you will have to change the config files before using align_new.sh)



*HOW TO GET UPDATED PHRASE TABLE:*
1. Append the forward alignments (fwd) generated by align_new.sh to the
forward (fwd) alignments generated by full_train.sh.
2. Append the inverse alignments (inv) generated by align_new.sh to the
inverse (inv) alignments generated by full_train.sh.
3. Run the moses training script with additional flags:

- --first-step -- first step in the training process (default
1)--------------- This will be 4
- --last-step -- last step in the training process (default
7)------------ This will remain 7
- --giza-f2e -- <path to folder>/new_giza.fwd
- --giza-e2f -- <path to folder>/new_giza.inv

For example:

~/mosesdecoder/scripts/training/train-model.perl -root-dir <your
training directory> \
-corpus <your new corpus name> \
-f <src> -e <tgt> -alignment grow-diag-final-and -reordering
msd-bidirectional-fe \
-lm 0:3:<path to LM>:8 \
--first-step 4 --last-step 7 --giza-f2e -- <path to
folder>/new_giza.fwd --giza-e2f -- <path to folder>/new_giza.inv \
-external-bin-dir <path to giza++ binaries>

For more details on the training step read this:
http://www.statmt.org/moses/?n=FactoredTraining.TrainingParameters

What this does is assumes that you have alignments and continue the phrase
extraction, reordering and generate the new moses.ini file.

WARNING: Specify the filenames and paths properly *OR IT WILL FAIL.*


If you are still unclear then please ask and I will try to help you as much
as I can.

Regards.




On Tue, Nov 4, 2014 at 6:09 PM, Ihab Ramadan <i.ramadan@saudisoft.com>
wrote:

> Dear Raj,
>
> That?s a great work my friend,
>
> This files make the script work but it takes long time to finish also it
> did not generate the model folder which contain the moses.ini file
>
> Is this normal?
>
> And I now try to run it again as I suspect that the server was shut down
> before the training was completed but i notice that it starts form the
> beginning and did not use the existing files generated
>
> Thanks Raj it still a great work
>
>
>
>
>
> *From:* Raj Dabre [mailto:prajdabre@gmail.com]
> *Sent:* Thursday, October 30, 2014 4:54 PM
>
> *To:* i.ramadan@saudisoft.com
> *Cc:* moses-support@mit.edu
> *Subject:* Re: [Moses-support] Incremental training
>
>
>
> Ahh.... i totally forgot that part.
>
> Sorry.
>
> PFA.
>
> Just place them in the folder where the shell scripts full_train.sh and
> align_new.sh are.
>
> Hopefully it should run now.
>
> Please let me know if you succeed.
>
>
>
> On Thu, Oct 30, 2014 at 11:44 PM, Ihab Ramadan <i.ramadan@saudisoft.com>
> wrote:
>
> Dear Raj,
>
> It is a great solution
>
> I installed MGIZA++ successfully and I am using your scripts to run
> training
>
> And I followed the steps you mentioned but I faces this error when I was
> running the full_train.sh script
>
>
>
> bla bla bla
>
> .
>
> .
>
> .
>
> .
>
>
>
> Starting MGIZA
>
> Initializing Global Paras
>
> DEBUG: EnterDEBUG: PrefixDEBUG: LogParsing Arguments
>
> ERROR: Cannot open configuration file configgiza.fwd!
>
> Starting MGIZA
>
> Initializing Global Paras
>
> DEBUG: EnterDEBUG: PrefixDEBUG: LogParsing Arguments
>
> ERROR: Cannot open configuration file configgiza.rev!
>
>
>
>
>
> This two files does not exists
>
> should they be generated from the installation?
>
> How to get them?
>
>
>
> *From:* Raj Dabre [mailto:prajdabre@gmail.com]
> *Sent:* Sunday, October 26, 2014 6:21 PM
> *To:* i.ramadan@saudisoft.com
> *Cc:* moses-support@mit.edu
> *Subject:* Re: [Moses-support] Incremental training
>
>
>
> Hello Ihab,
>
> I would suggest using mgiza++.
> http://www.kyloo.net/software/doku.php/mgiza:overview
>
> It is very easy to use.
>
> I also wrote some scripts to make it easy for training.
> Visit the link below for my scripts.
>
> https://drive.google.com/folderview?id=0B2gN8qfxTTUoSU43OFBhZXpPZ3M&usp=sharing
>
> Usage:
>
> To train basic IBM models:
> bash full_train.sh <src_corpus_file_name> <tgt_corpus_file_name>
> <model_folder_base> <corpus_folder_base> <path_to_mgizapp_installation>
>
> To align 2 new files using previously trained models (aka continue
> training).
>
> bash align_new.sh <new_src_corpus_file_name> <new_tgt_corpus_file_name>
> <old_src_corpus_file_name> <old_tgt_corpus_file_name> <model_folder_base>
> <corpus_folder_base> <path_to_mgizapp_installation>
>
> There is also a python script which you had better replace in the scripts
> folder of mgiza++. I have modified it to work with my scripts.
>
> Hope this helps.
>
>
>
>
>
> On Sun, Oct 26, 2014 at 11:05 PM, Ihab Ramadan <i.ramadan@saudisoft.com>
> wrote:
>
> Dear All,
>
> I just need a clear steps on how to do incremental training in moses, as
> the illustration in the manual is not cleared enough
>
> Thanks
>
>
>
> Best Regards
>
> *Ihab Ramadan*| Senior Developer| Saudisoft <http://www.saudisoft.com/> -
> Egypt | *Tel * +2 02 330 320 37 Ext- 0 | Mob+201007570826 | Fax
> +20233032036 | *Follow us on *[image: linked]
> <http://www.linkedin.com/company/77017?trk=vsrp_companies_res_name&trkInfo=VSRPsearchId%3A1489659901402995947155%2CVSRPtargetId%3A77017%2CVSRPcmpt%3Aprimary>* |
> **[image: ZA102637861]*
> <https://www.facebook.com/pages/Saudisoft-Co-Ltd/289968997768973?ref_type=bookmark>* |
> **[image: ZA102637858]* <https://twitter.com/Saudisoft>
>
>
>
>
> _______________________________________________
> Moses-support mailing list
> Moses-support@mit.edu
> http://mailman.mit.edu/mailman/listinfo/moses-support
>
>
>
>
> --
>
> Raj Dabre.
> Research Student,
>
> Graduate School of Informatics,
> Kyoto University.
>
> CSE MTech, IITB., 2011-2014
>
>
>
>
> --
>
> Raj Dabre.
> Research Student,
>
> Graduate School of Informatics,
> Kyoto University.
>
> CSE MTech, IITB., 2011-2014
>



--
Raj Dabre.
Research Student,
Graduate School of Informatics,
Kyoto University.
CSE MTech, IITB., 2011-2014
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End of Moses-support Digest, Vol 97, Issue 4
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