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TensorCompilation

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Description

Summary

How a matrix and the arithmetic on it compile: a Matrix node becomes
a GenTensor`2 over its elements' common type, filled element by
element from the compiled elements, and a sum, difference, product, quotient or power
with a matrix in it becomes the tensor operation of the same name -- PiecewiseAdd,
MatrixMultiply, PiecewiseMultiply by a scalar, MatrixPower -- so
that the compiled delegate runs GenericTensor's arithmetic rather than a tree of scalar
operations.

Remarks

The methods the compiled tree calls are the public generic ones below, closed over each
element type at compile time in the kit for that type and named through expression
trees, the way CompilationProtocol keeps its own tables: no generic type or
method is constructed at run time, which a trimmed or NativeAOT build could not do.
https://github.com/asc-community/AngouriMath/issues/363
https://github.com/asc-community/AngouriMath/issues/526

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