Keir Mierle f7898fba1b Add a general sparse iterative solver: CGNR
This adds a new LinearOperator which implements symmetric
products of a matrix, and a new CGNR solver to leverage
CG to directly solve the normal equations. This also
includes a block diagonal preconditioner. In experiments
on problem-16, the non-preconditioned version is about
1/5 the speed of SPARSE_SCHUR, and the preconditioned
version using block cholesky is about 20% slower than
SPARSE_SCHUR.
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2012-04-30 23:09:08 -07:00

Ceres Solver - A non-linear least squares minimizer
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Please see ceres.pdf in docs/ for a tutorial and reference.
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