Steiner Tree Metric

[kittobi1992]

This change introduces the Steiner tree metric in Mt-KaHyPar. It can be used to map the node set of a (hyper)graph onto the nodes of a target graph such that the weight of all Steiner trees induced by the hyperedges on the target graph is minimized. A Steiner tree is a tree that spans a subset of the nodes (hyperedges) on a graph, which is known to be a NP-hard problem. This objective function accurately models wire-lengths in VLSI design and communication costs in distributed systems when some processors are not connected with each other directly or communicate with different speed.

[codecov]

Codecov Report

Merging #150 (23cb1fb) into master (bd806b0) will decrease coverage by 2.43%.
The diff coverage is 62.33%.

❗ Current head 23cb1fb differs from pull request most recent head f0e6323. Consider uploading reports for the commit f0e6323 to get more accurate results

@@            Coverage Diff             @@
##           master     #150      +/-   ##
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- Coverage   80.69%   78.26%   -2.43%     
==========================================
  Files         162      190      +28     
  Lines       15599    18140    +2541     
  Branches     6320     7425    +1105     
==========================================
+ Hits        12588    14198    +1610     
- Misses       3011     3942     +931     

Impacted Files	Coverage Δ
mt-kahypar/datastructures/static_graph.h	87.31% <ø> (ø)
mt-kahypar/io/hypergraph_factory.cpp	68.25% <ø> (ø)
mt-kahypar/macros.h	100.00% <ø> (ø)
mt-kahypar/parallel/memory_pool.h	81.45% <0.00%> (-0.50%)	⬇️
...ypar/partition/coarsening/multilevel_uncoarsener.h	100.00% <ø> (ø)
...-kahypar/partition/coarsening/nlevel_uncoarsener.h	100.00% <ø> (ø)
.../initial_partitioning/greedy_initial_partitioner.h	100.00% <ø> (ø)
...rtitioning/label_propagation_initial_partitioner.h	100.00% <ø> (ø)
mt-kahypar/partition/mapping/greedy_mapping.cpp	0.00% <0.00%> (ø)
mt-kahypar/partition/mapping/greedy_mapping.h	0.00% <0.00%> (ø)
... and 84 more

... and 4 files with indirect coverage changes

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