By Striegnitz K., et al.
The identify Computational Linguistics already means that this displine includes comparable items of study: typical language (NL) is studied and operational equipment are built. either fields are investigated of their personal correct and divide into a variety of subject matters. This path introduces a number of NL phenomena including acceptable implementations within the programming language Prolog. the themes handled are between others Morphology, Finite kingdom ideas, Syntax, Context unfastened Grammars, Parsing, and Semantics development.
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Extra resources for Algorithms for computational linguistics
Here is a picture illustrating the two steps of our morphological parser with some examples. surface form ✡☞☛ split word into possible morphemes ✡✌☛ intermediate ✡✌☛ form map stems to categories and affixes to meaning ✡☞☛ underlying form 26 Chapter 2. Finite State Parsers and Transducers cat cats mouse mice foxes cat cat + s mouse mice fox + s cat N SG cat N PL mouse N SG mouse N PL fox N PL We will now build two transducers: one to do the mapping from the surface form to the intermediate form and the other one to do the mapping from the intermediate form to the underlying form.
Mice to mouse) and then it should add N and PL. So, the general structure of this transducer looks like this: regular stem 1 2 singular irregular stem plural irregular stem 3 4 ε:N ε:N ε:N 5 +:ε 6 8 ε:SG s:PL 9 ε:SG 7 ε:PL What still needs to be specified is how exactly the parts between state 1 and states 2,3, and 4 respectively look like. Here, we need to recognize noun stems and decide whether they are regular or not. We do this be encoding a lexicon in the following way. The transducer part that recognizes cat, for instance, looks like this: c:c a:a t:t And the transducer part mapping mice to mouse can be specified as follows: m:m i:o ε:u c:s e:e 28 Chapter 2.
Specifies what transitions can be made in the automaton s is the start state of the automaton. F is the set of final states of the automaton. How does δ specify what transitions can be made? It states for each state-symbol-pair in the automaton, where the transition from the respective state over the symbol leads. So δ is a relation over ✓ Q ★ Σ ✖ ★ Q. We can also require that δ be a function, making the automaton deterministic. e. δ) by giving trans/4-terms. The initial state (s) was given as a start/2-term, and the final states (F) in the form of final/2-terms.