no code implementations • 12 Jul 2022 • Lluís Alemany-Puig, Ramon Ferrer-i-Cancho
In the domain of applications, we derive a $O(n)$-time algorithm to calculate the expected value of the sum of edge lengths.
no code implementations • 14 Jun 2022 • Lluís Alemany-Puig, Juan Luis Esteban, Ramon Ferrer-i-Cancho
In the projective variant for rooted trees, arrangements have to be planar and the root of the tree cannot be covered by any edge.
1 code implementation • 5 Dec 2021 • Lluís Alemany-Puig, Juan Luis Esteban, Ramon Ferrer-i-Cancho
One of the main concerns in this field is the statistical patterns of syntactic dependency structures.
no code implementations • CL (ACL) 2022 • Lluís Alemany-Puig, Ramon Ferrer-i-Cancho
Thus far, the expectation of the sum of dependency distances in random projective shufflings of a sentence has been estimated approximately with a Monte Carlo procedure whose cost is of the order of $Rn$, where $n$ is the number of words of the sentence and $R$ is the number of samples; it is well known that the larger $R$, the lower the error of the estimation but the larger the time cost.
no code implementations • 5 Feb 2021 • Lluís Alemany-Puig, Juan Luis Esteban, Ramon Ferrer-i-Cancho
Gildea and Temperley (GT) sketched an algorithm for projective arrangements which they claimed runs in $O(n)$ but did not provide any justification of its cost.
2 code implementations • 30 Jul 2020 • Ramon Ferrer-i-Cancho, Carlos Gómez-Rodríguez, Juan Luis Esteban, Lluís Alemany-Puig
Here we recast the problem of the optimality of the word order of a sentence as an optimization problem on a spatial network where the vertices are words, arcs indicate syntactic dependencies and the space is defined by the linear order of the words in the sentence.
no code implementations • 6 Mar 2020 • Lluís Alemany-Puig, Ramon Ferrer-i-Cancho
The crossing number of a graph $G$, $\mathrm{cr}(G)$, is the minimum number of edge crossings arising when drawing a graph on a certain surface.
Computation Discrete Mathematics Data Structures and Algorithms Combinatorics