The Graph BLAS Forum

An effort to define standard building blocks for Graph Algorithms in the language of Linear Algebra.

We believe that the state of the art in constructing a large collection of graph algorithms in terms of linear algebraic operations is mature enough to support the emergence of a standard set of primitive building blocks. We believe that it is critical to move quickly and define such a standard; thereby freeing up researchers to innovate and diversify at the level of higher level algorithms and graph analytics applications. This effort was inspired by the Basic Linear Algebra Subprograms (BLAS) of dense Linear Algebra and hence our working name for this standard is “the Graph BLAS”.

The key insight behind this work is that when a graph is represented by a sparse incidence matrix, Sparse Matrix-vector multiplication is the dual of Breadth First Search. By generalizing the pair of operations involved in the linear algebra computations to define a semiring, we can extend the range of these primitives to support a wide range of parallel graph algorithms.

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