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external:tectomt:tutorial [2009/01/20 18:10]
popel |
external:tectomt:tutorial [2009/01/21 10:53]
kravalova |
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| It is assumed that finite clauses can be translated independently, which would reduce computational complexity or make parallel translation possible. We could even use hybrid translation - each finite clause could be translated by the most self-confident translation system. In this task, we are going to split the sentence into finite clauses. | It is assumed that finite clauses can be translated independently, which would reduce computational complexity or make parallel translation possible. We could even use hybrid translation - each finite clause could be translated by the most self-confident translation system. In this task, we are going to split the sentence into finite clauses. |
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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_clause_head'' which is set to ''1'' if the ''a-node'' corresponds to a finite verb, and to ''0'' otherwise. |
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| ==== Instructions ==== | ==== Instructions ==== |
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| There is a block template with hints in ''libs/blocks/Tutorial/Mark_heads.pm''. You should edit the block so that the ouput of this block is the same a-tree, in addition with attribute ''is_head'' attached to each ''a-node''. There is also a printing block ''libs/blocks/Print_finite_clauses.pm'' which will print out the ''a-nodes'' grouped by clauses: | There is a block template with hints in ''libs/blocks/Tutorial/Mark_heads.pm''. You should edit the block so that the output of this block is the same a-tree, in addition with attribute ''is_clause_head'' attached to each ''a-node''. There is also a printing block ''libs/blocks/Print_finite_clauses.pm'' which will print out the ''a-nodes'' grouped by clauses: |
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| <code bash> | <code bash> |
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| //Advanced version//: The output of our block might still be incorrect in special cases - we don't solve coordination and subordinate conjunctions. | //Advanced version//: The output of our block might still be incorrect in special cases - we don't solve coordination (see the second sentence in sample.txt) and subordinate conjunctions. |
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| ===== Your turn: more tasks ===== | ===== Your turn: more tasks ===== |
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| * To find an object to a verb, look for objects among effective children of a verb (''$child->get_attr('afun') eq 'Obj' ''). That implies working on analytical layer. | * To find an object to a verb, look for objects among effective children of a verb (''$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 surface word order of a node is useful: ''$node->get_attr('ord')''. It can be used to print out nodes sorted by attribute ''ord''. |
| * For debugging, a method returning word order of a node is useful: ''$node->get_attr('ord')''. It can be used to print out nodes sorted by attribute ''ord''. | * Once you have node ''$object'' and node ''$verb'', use method ''$object->shift_before_node($verb)''. This method takes the whole subtree under node ''$object'' and counts the attributes ''ord'' (surface word order) so that all nodes in subtree under ''$object'' have smaller ''ord'' than ''$verb''. That is, the method rearranges the surface word order from VO to OV. |
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| ==== Prepositions ==== | ==== Prepositions ==== |
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| **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. | {{ external:tectomt:preps.png?200x80|}} |
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| TODO obrazek | **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. |
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| **Task**: 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. |
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| //Advanced version//: What happens in case of multiword prepositions? For example, ''because of'', ''instead of''. Can you handle it? | //Advanced version//: What happens in case of multiword prepositions? For example, ''because of'', ''instead of''. Can you handle it? |
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