Download Experimental Algorithms: 6th International Workshop, WEA by Corinna Cortes, Mehryar Mohri, Ashish Rastogi (auth.), Camil PDF

By Corinna Cortes, Mehryar Mohri, Ashish Rastogi (auth.), Camil Demetrescu (eds.)

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In addition, our experiments indicate that the impact of priority queue implementations diminishes with advanced speedup techniques since these techniques at the same time introduce additional overheads and dramatically reduce the queue sizes. Bidirectional Search executes Dijkstra’s algorithm simultaneously forward from the source and backwards from the target. Once some node has been visited from both directions, the shortest path can be derived from the information already gathered [4]. In a road network, where search spaces will take a roughly circular shape, we can expect a speedup around two —one disk with radius d(s, t) has twice the area of two disks with half the radius.

Invited for ACM Journal of Experimental Algorithmics (special issue Alenex 2006) (2007) 31. : An experimental evaluation of point-to-point shortest path calculation on roadnetworks with precalculated edge-flags. In: 9th DIMACS Implementation Challenge [29] (2006) 32. : Better landmarks within reach. In: 9th DIMACS Implementation Challenge [29] (2006) 33. : Design and implementation of an efficient hierarchical speed-up technique for computation of exact shortest paths in graphs. : (2006) 34. : High-performance multi-level graphs.

Our conclusion from these experiences was to design our own graph data structures adapted to the problem at hand. We use C++ with encapsulated abstract data types. Templates and inline functions make this possible without performance penalties. 1 There are plenty of things that can go wrong both with the algorithms and their implementations. For example, we had several cases where the algorithm considered was only correct when all shortest paths are unique. , queries are checked against Dijkstra’s algorithm and fast preprocessing algorithms are checked against naive or old implementations.

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