Introducing a few local preconditioners#2259

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sv2518 merged 9 commits intomasterfrom

sv/local-preconditioners

Nov 4, 2021

Commits on Nov 1, 2021

HybridizationPC: Refactor and rename petsc options for nesting the Schur complement.
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Slate: Introduce DiagonalTensor, which takes in a Tensor A and represents a tensor of the same shape as A, but only carries the diagonal of A.
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Slate: Give user the option to assemble the diagonal of a Tensor through TSFC. The diagonal is returned in vector-shape.
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Testing: Add tests for Slate's DiagonalTensors and the assembly of Slate Tensors with the diagonal option.
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Slate2Gem: Optimise codegen for inverse of Slate's DiagonalTensor.
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Slate: Add support for reciprocals of vectors. This is needed for the matfree application of diagonal preconditioners.
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Testing: Test the optimisation for inverses on Slate's DiagonalTensors and the codegen for Slate's Reciprocal.
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Commits on Nov 2, 2021