
17
Graph Representations
Xavier Bresson 17
Graphs are rank-
2
tensors. They can be represented as
List of edges (short lists for sparse graphs):
E
=
[ {1,2}, {1,3}, {2,3}, {3,4} ]
Matrix (dense tensor):
Other tensors :
Vectors (ordered and unordered sets) are rank-
1
tensors :
General tensors (s.a. 3D-MRIs or hyper-graphs) of rank-
m
:
index 1
index 4
index 3
index 2
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2 R
n
m
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<latexit sha1_base64="H2ojkUv6xoIXh/dZUhqXHtKfwhI=">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</latexit>
A =
2
6
6
4
0110
1010
1101
0010
3
7
7
5
2 R
n⇥n
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<latexit sha1_base64="IY45M3e7jKl2yOFMl66x3TQQ12Y=">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</latexit>