tree f7ed94ea5c638f141a1c759a4bb285f2476887ae
parent c3c3dd872bd98c3df258d46dd76f93be8f81b73c
author Sameer Agarwal <sameeragarwal@google.com> 1366499276 -0700
committer Sameer Agarwal <sameeragarwal@google.com> 1367030865 -0700

Block ordering for SPARSE_SCHUR + CX_SPARSE.

Uptil now only SuiteSparse when used with SPARSE_SCHUR would use
the block structure of the reduced camera matrix to find a fill-reducing
ordering.

This leads to substantial speedup for some bundle adjustment
problems.

Credit for this technique goes to the authors of g2o. I learned
about it from reading their source code.

Change-Id: I5403efefd4d9552c9c6fc6e02a65498bdf171584