tree 352c288b0a8a9d64efc2e4d3f27416d8b6496e75
parent d8dad14eed1cd162526277b08012a2f82024098b
author Sameer Agarwal <sameeragarwal@google.com> 1659902055 -0700
committer Sameer Agarwal <sameeragarwal@google.com> 1659902202 -0700

Fix a bug in InnerProductComputer.

InnerProductComputer was assuming that the input matrix had
at least one structurally non-zero block. As a result sometimes
when InnerProductComputer.SubMatrix test generated matrices
where the submatrix was structurally zero it would cause
a segmentation fault.

This changes fixes this issue and reduces the threshold for the
minimum block density so that there is a much higher chance of
such matrices occuring as part of testing.

Fixes https://github.com/ceres-solver/ceres-solver/issues/820

Change-Id: Iec3a2431e646f0c2aac9e0b994531fa72323f329