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external:tectomt:tutorial [2009/01/20 11:58]
kravalova 		external:tectomt:tutorial [2009/01/20 15:36]
kravalova
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 TectoMT is a highly modular NLP (Natural Language Processing) software system implemented in Perl programming language under Linux. It is primarily aimed at Machine Translation, making use of the ideas and technology created during the Prague Dependency Treebank project. At the same time, it is also hoped to significantly facilitate and accelerate development of software solutions of many other NLP tasks, especially due to re-usability of the numerous integrated processing modules (called blocks), which are equipped with uniform object-oriented interfaces.  TectoMT is a highly modular NLP (Natural Language Processing) software system implemented in Perl programming language under Linux. It is primarily aimed at Machine Translation, making use of the ideas and technology created during the Prague Dependency Treebank project. At the same time, it is also hoped to significantly facilitate and accelerate development of software solutions of many other NLP tasks, especially due to re-usability of the numerous integrated processing modules (called blocks), which are equipped with uniform object-oriented interfaces. 
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 ===== Prerequisities ===== ===== Prerequisities =====
 +
 +In this tutorial, we assume 
 +
 +  * Your system is Linux
 +  * Your shell is bash
 +  * You have basic experience bash and you can read Perl
 +
 +
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 +
  
  
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 ==== Installation and setup ==== ==== Installation and setup ====
  
-TODO popsat instalaci+  * Checkout SVN repository. If you are running this installation in computer lab in Prague, you have checkout the repository into directory /home/BIG (because data quotas don't apply here):
  
-Before running any experiments with TectoMT, you must set up your environment by running+<code bash> 
 +    cd ~/BIG 
 +    svn --username <username> co https://svn.ms.mff.cuni.cz/svn/tectomt_devel/trunk tectomt 
 +</code> 
 + 
 +  * In ''tectomt/install/'' run ./install.sh:
  
 <code bash> <code bash>
-source config/init_devel_environ.sh+    cd tectomt/install 
 +    ./install.sh
 </code> </code>
 +
 +  * In your ''.bashrc'' file, add line (or source this file every time before experimenting with TectoMT):
 +
 +<code bash>
 +    source ~/BIG/tectomt/config/init_devel_environ.sh
 +</code>
 +
 +
 +
 +
  
  
  
  
-==== Theoretical background ==== 
  
-TODO obrazek 
  
  
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-==== TrEd ==== 
  
-TODO malicko o TrEdu a obrazek 
  
  
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 This tutorial itself has its blocks in ''libs/blocks/Tutorial'' and the application in ''applications/tutorial''. This tutorial itself has its blocks in ''libs/blocks/Tutorial'' and the application in ''applications/tutorial''.
 +
  
  
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 ==== Layers of Linguistic Structures ==== ==== Layers of Linguistic Structures ====
 +
 +{{ external:tectomt:pyramid.gif?300x190|MT pyramid in terms of PDT layers}}
  
 TectoMT blocks repository is saved in ''libs/blocks/''. In correspondence with ..., the blocks are located in directories describing their purpose.  TectoMT blocks repository is saved in ''libs/blocks/''. In correspondence with ..., the blocks are located in directories describing their purpose. 
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 ==== Task ==== ==== Task ====
 A block which, given an analytical tree (''SEnglishA''), fills each ''a-node'' with boolean attribute ''is_head'' which is set to ''1'' if the ''a-node'' corresponds to a finite verb, and to ''0'' otherwise. A block which, given an analytical tree (''SEnglishA''), fills each ''a-node'' with boolean attribute ''is_head'' which is set to ''1'' if the ''a-node'' corresponds to a finite verb, and to ''0'' otherwise.
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-//Note//: The output of our block is not ideal - we don't solve coordination and subordinate conjunctions. But for the time being, we can move on to some other tasks.+//Advanced version//: The output of our block might still be incorrect in special cases - we don't solve coordination and subordinate conjunctions.
  
  
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-==== SVO typology ==== 
  
-TODO+ 
 + 
 + 
 + 
 + 
 +==== SVO to SOV ==== 
 + 
 +**Motivation**: During translation from an SVO based language (English) to an SOV based language (Korean) we might need to change the word order from SVO to SOV.  
 + 
 +**Task**: Change the word order from SVO to SOV. 
 + 
 +**Instructions**:  
 + 
 +  * To find an object to a verb, look for objects among effective children of a verb (''$child->get_attr('afun') eq 'Obj' ''). That implies working on analytical layer. 
 +  * Once you have node ''$object'' and node ''$verb'', use method TODO  
 +  * For debugging, a method returning word order of a node is useful: ''$node->get_attr('ord')''. It can be used to print out nodes sorted by attribute ''ord''. 
 + 
 + 
 + 
 + 
 + 
 + 
 + 
 + 
 + 
  
  
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 ==== Prepositions ==== ==== Prepositions ====
  
-In dependency approach a question "where to hang prepositions" arises. In praguian style (PDT), prepositions are heads of the subtree and the noun/pronoun is dependent on the preposition. However, another ordering might be preferable: The noun/pronoun might be the head of subtree, while the preposition would take the role of a modifier.+**Motivation**: In dependency approach a question "where to hang prepositions" arises. In praguian style (PDT), prepositions are heads of the subtree and the noun/pronoun is dependent on the preposition. However, another ordering might be preferable: The noun/pronoun might be the head of subtree, while the preposition would take the role of a modifier.
  
 TODO obrazek TODO obrazek
  
-The task is to rehang all prepositions as indicated at the picture. You may assume that prepositions have at most 1 child.+**Task**: The task is to rehang all prepositions as indicated at the picture. You may assume that prepositions have at most 1 child. 
 + 
 +** Instructions**:
  
 You are going to need these new methods: You are going to need these new methods:
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   * ''$node->set_parent($parent)''   * ''$node->set_parent($parent)''
  
-You can use block template in ''libs/blocks/BlockTemplate.pm''. To see the results, you can again use TrEd (''tmttred sample.tmt'')+//Hint//:  
 +  * On analytical layer, you can use this test to recognize prepositions: ''$node->get_attr('afun') eq 'AuxP' ''  
 +  * You can use block template in ''libs/blocks/BlockTemplate.pm''. To see the results, you can again use TrEd (''tmttred sample.tmt'') 
  
 +//Advanced version//: What happens in case of multiword prepositions? For example, ''because of'', ''instead of''. Can you handle it?
  
  

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