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courses:rg:2011-report-parser [2012/09/27 09:41] ufal |
courses:rg:2011-report-parser [2012/09/27 10:39] ufal |
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* their scheme is based on the Stanford' | * their scheme is based on the Stanford' | ||
+ | ==== Conversion process ==== | ||
+ | * converting phrase trees of Penn Treebank to dependency ones | ||
+ | * it consists of 3 steps: | ||
+ | - add structure to flat NPs | ||
+ | - constituent-to-dependency converter with some head-finding rule modifications | ||
+ | * a list of rules in Figure 2 is hardly understandable without reading a paper their conversion method is related to | ||
+ | * they reduced the number of generic " | ||
+ | * Stanford tags are hierarchical and " | ||
+ | * 1.3% of arcs are non-projective (out of 8.1% of all non-projective arcs) because of the following conversion (agreement can be a motivation for this, i.e. in Czech): | ||
+ | {{: | ||
+ | | ||
+ | ==== Parser ==== | ||
+ | |||
+ | * we illustrated a step of the parser: | ||
+ | {{: | ||
+ | * we compared time complexity of this system with other commonly used ones |