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external:tectomt:tutorial [2009/01/22 11:03]
kravalova 		external:tectomt:tutorial [2009/01/22 11:51]
kravalova
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 ====== TectoMT Tutorial ====== ====== TectoMT Tutorial ======
  
-Welcome at TectoMT Tutorial. This tutorial should take about 2 hours.+Welcome at TectoMT Tutorial. This tutorial should take about 3 hours. 
  
  
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 ===== What is TectoMT ===== ===== What is TectoMT =====
  
-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 facilitate and significantly 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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   * Your shell is bash   * Your shell is bash
   * You have basic experience with bash and can read basic Perl   * You have basic experience with bash and can read basic Perl
 +
 +
 +
  
  
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 ==== Installation and setup ==== ==== Installation and setup ====
  
-  * Checkout SVN repository. If you are running this installation in computer lab in Prague, you have to checkout the repository into directory ''/home/BIG'' (because data quotas don't apply here):+  * Checkout SVN repository. If you are running this installation in computer lab in Prague, you have to checkout the repository into directory ''/home/BIG'' (because bigger disk quota applies here):
  
 <code bash> <code bash>
     cd ~/BIG     cd ~/BIG
-    svn --username <username> co https://svn.ms.mff.cuni.cz/svn/tectomt_devel/trunk tectomt+    svn --username mtm co https://svn.ms.mff.cuni.cz/svn/tectomt_devel/trunk tectomt
 </code> </code>
  
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 </code> </code>
  
-  * In your ''.bashrc'' file, add line (or source this file every time before experimenting with TectoMT):+  * In your ''.bashrc'' file, add line (or source the specified file every time before experimenting with TectoMT):
  
 <code bash> <code bash>
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 There are also other directories for other purpose blocks, for example blocks which only print out some information go to ''libs/Print''. Our tutorial blocks are in ''libs/blocks/Tutorial/''. There are also other directories for other purpose blocks, for example blocks which only print out some information go to ''libs/Print''. Our tutorial blocks are in ''libs/blocks/Tutorial/''.
 +
  
  
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   * A document consists of a sequence of bundles (''<bundle>''), mirroring a sequence of natural language sentences originating from the text. So, for one sentence we have one ''<bundle>''.   * A document consists of a sequence of bundles (''<bundle>''), mirroring a sequence of natural language sentences originating from the text. So, for one sentence we have one ''<bundle>''.
   * Each bundle contains tree shaped sentence representations on various linguistic layers. In our example ''sample.tmt'' we have morphological tree (''SEnglishM'') in each bundle. Later on, also an analytical layer (''SEnglishA'') will appear in each bundle as we proceed with our analysis.    * Each bundle contains tree shaped sentence representations on various linguistic layers. In our example ''sample.tmt'' we have morphological tree (''SEnglishM'') in each bundle. Later on, also an analytical layer (''SEnglishA'') will appear in each bundle as we proceed with our analysis. 
-  * Trees are formed by nodes and edges. Attributes can be attached only to nodes. Edge's attributes must be equivalently stored as the lower node's attributes. Tree's attributes must be stored as attributes of the root node.+  * Trees are formed by nodes and edges. Attributes can be attached only to nodes. Edge's attributes must be stored as the lower node's attributes. Tree's attributes must be stored as attributes of the root node. 
 + 
  
  
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 </code> </code>
  
-//Note//: Makefiles use tabulators to mark command lines. Make sure your lines start with tabulator (or two tabulators) and not, for example, with 4 spaces.+//Note//: Makefiles use tabulators to mark command lines. Make sure your lines start with a tabulator (or two tabulators) and not, for example, with 4 spaces.
  
 After running After running
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 Try to click on some nodes to see their parameters (tag, lemma, form, analytical function etc). Try to click on some nodes to see their parameters (tag, lemma, form, analytical function etc).
 +
 +//Note//: For more information about tree editor TrEd, see [[http://ufal.mff.cuni.cz/~pajas/tred/ar01-toc.html|TrEd User's Manual]].
  
  
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 ==== Task ==== ==== Task ====
 A block which, given an analytical tree (''SEnglishA''), fills each ''a-node'' with boolean attribute ''is_clause_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_clause_head'' which is set to ''1'' if the ''a-node'' corresponds to a finite verb, and to ''0'' otherwise.
 +
  
  
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 //Note//: ''get_children()'' returns topological node children in a tree, while ''get_eff_children()'' returns node children in a linguistic sense. Mostly, these do not differ. If interested, see Figure 1 in [[http://ufal.mff.cuni.cz/pdt2.0/doc/tools/tred/bn-tutorial.html|btred tutorial]]. //Note//: ''get_children()'' returns topological node children in a tree, while ''get_eff_children()'' returns node children in a linguistic sense. Mostly, these do not differ. If interested, see Figure 1 in [[http://ufal.mff.cuni.cz/pdt2.0/doc/tools/tred/bn-tutorial.html|btred tutorial]].
 +
 +//Hint//: Finite clauses in English usually require grammatical subject to be present.
  
 ==== Advanced version ==== ==== Advanced version ====
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 ===== Your turn: more tasks ===== ===== Your turn: more tasks =====
 +
  
  
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 **Instructions**:  **Instructions**: 
  
 +  * You can use block template in ''libs/blocks/BlockTemplate.pm''. 
   * To find an object to a verb, look for objects among effective children of a verb (''$child<nowiki>-></nowiki>get_attr('afun') eq 'Obj' ''). That implies working on analytical layer.   * To find an object to a verb, look for objects among effective children of a verb (''$child<nowiki>-></nowiki>get_attr('afun') eq 'Obj' ''). That implies working on analytical layer.
   * For debugging, a method returning surface word order of a node is useful: ''$node<nowiki>-></nowiki>get_attr('ord')''. It can be used to print out nodes sorted by attribute ''ord''.   * For debugging, a method returning surface word order of a node is useful: ''$node<nowiki>-></nowiki>get_attr('ord')''. It can be used to print out nodes sorted by attribute ''ord''.
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 **Advanced version**: This solution shifts object (or more objects) of a verb just in front of that verb node. So f.e.: //Mr. Brown has urged MPs.// changes to: //Mr. Brown has MPs urged.// You can try to change this solution, so the final sentence would be: //Mr. Brown MPs has urged.// You may need a method ''$node->shift_after_subtree($root_of_that_subtree)''. Subjects should have attribute '''afun' eq 'Sb'''. **Advanced version**: This solution shifts object (or more objects) of a verb just in front of that verb node. So f.e.: //Mr. Brown has urged MPs.// changes to: //Mr. Brown has MPs urged.// You can try to change this solution, so the final sentence would be: //Mr. Brown MPs has urged.// You may need a method ''$node->shift_after_subtree($root_of_that_subtree)''. Subjects should have attribute '''afun' eq 'Sb'''.
 +
  
  
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 //Hint//:  //Hint//: 
   * On analytical layer, you can use this test to recognize prepositions: ''$node<nowiki>-></nowiki>get_attr('afun') eq 'AuxP' ''    * On analytical layer, you can use this test to recognize prepositions: ''$node<nowiki>-></nowiki>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'')   * To see the results, you can again use TrEd (''tmttred sample.tmt'')
  

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