Search Results for author: Romeo Rizzi

Found 5 papers, 1 papers with code

Accelerating ILP solvers for Minimum Flow Decompositions through search space and dimensionality reductions

1 code implementation17 Nov 2023 Andreas Grigorjew, Fernando H. C. Dias, Andrea Cracco, Romeo Rizzi, Alexandru I. Tomescu

Given a flow network, the Minimum Flow Decomposition (MFD) problem is finding the smallest possible set of weighted paths whose superposition equals the flow.

When a Dollar Makes a BWT

no code implementations24 Aug 2019 Sara Giuliani, Zsuzsanna Lipták, Francesco Masillo, Romeo Rizzi

In many applications, a sentinel character dollar is added to mark the end of the string, and thus the BWT of a string ending with dollar contains exactly one dollar-character.

Data Structures and Algorithms

Decoding Hidden Markov Models Faster Than Viterbi Via Online Matrix-Vector (max, +)-Multiplication

no code implementations30 Nov 2015 Massimo Cairo, Gabriele Farina, Romeo Rizzi

In this paper, we present a novel algorithm for the maximum a posteriori decoding (MAPD) of time-homogeneous Hidden Markov Models (HMM), improving the worst-case running time of the classical Viterbi algorithm by a logarithmic factor.

Dynamic Consistency of Conditional Simple Temporal Networks via Mean Payoff Games: a Singly-Exponential Time DC-Checking

no code implementations4 May 2015 Carlo Comin, Romeo Rizzi

The presentation of such connection is mediated by the Hyper Temporal Network model, a tractable generalization of Simple Temporal Networks whose consistency checking is equivalent to determining Mean Payoff Games.

Hyper Temporal Networks

no code implementations13 Mar 2015 Carlo Comin, Roberto Posenato, Romeo Rizzi

Simple Temporal Networks (STNs) provide a powerful and general tool for representing conjunctions of maximum delay constraints over ordered pairs of temporal variables.

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