Download Bridging the Gap Between Graph Edit Distance and Kernel by Michel Neuhaus PDF

By Michel Neuhaus

ISBN-10: 9812708170

ISBN-13: 9789812708175

In graph-based structural development reputation, the assumption is to rework styles into graphs and practice the research and popularity of styles within the graph area - mostly known as graph matching. lots of equipment for graph matching were proposed. Graph edit distance, for example, defines the dissimilarity of 2 graphs by way of the volume of distortion that's had to remodel one graph into the opposite and is taken into account probably the most versatile tools for error-tolerant graph matching.This e-book makes a speciality of graph kernel services which are hugely tolerant in the direction of structural error. the elemental proposal is to include suggestions from graph edit distance into kernel features, hence combining the pliability of edit distance-based graph matching with the facility of kernel machines for trend attractiveness. The authors introduce a suite of novel graph kernels regarding edit distance, together with diffusion kernels, convolution kernels, and random stroll kernels. From an experimental review of a semi-artificial line drawing information set and 4 real-world info units together with photographs, microscopic pictures, fingerprints, and molecules, the authors exhibit that a few of the kernel capabilities at the side of aid vector machines considerably outperform conventional edit distance-based nearest-neighbor classifiers, either when it comes to class accuracy and operating time.

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Additional info for Bridging the Gap Between Graph Edit Distance and Kernel Machines (Series in Machine Perception and Artificial Intelligence)

Example text

It is clear that in this example the nine possible distinct node substitutions are A → a, A → b, A → c, B → a, B → b, B → c, C → a, C → b, and C → c. When constructing the 9 × 9 matrix Q, each row and column is associated with one of these substitutions. In Fig. 10, an example cost matrix Q is shown for the two graphs in Fig. 9. Note that for the sake of clarity, only rows of the matrix are indexed with their associated node substitution; the corresponding column indices are omitted. In this example, node substitution costs are set equal to the squared Euclidean distance of the two node labels, and node and edge insertion and deletion costs are set to a constant value of 10.

At the same time, insertions and deletions should have higher costs than moderate substitutions. The overall objective is to use edit costs that tend to favor weak substitutions over strong substitutions and over insertions and deletions. For graphs intuitively considered similar, there should consequently exist an edit path between them with cheap edit operations only. Conversely, for dissimilar graphs, all edit paths will have high costs, since each edit path will contain at least some edit operations associated with strong distortions.

For a given dimension n ≥ 1, let us assume that a symmetric matrix Q ∈ n×n and a July 21, 2007 21:8 World Scientific Book - 9in x 6in bookmain 41 Graph Edit Distance vector c ∈ n are given. Furthermore for l, m ≥ 1, let matrices R ∈ l×n and S ∈ m×n as well as vectors u ∈ l and v ∈ m be given. 3) such that Rx = u Sx ≥ v . Note that the vector inequality constraint in the last line means that all components of the two vectors must satisfy the inequality. Solving the quadratic programming problem consists in finding an x ∈ n that minimizes f (x) such that the given equality and inequality conditions are satisfied.

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