Adding VLOG output to line search.
- Previously line search was sparse in terms of debug orientated VLOG
output which made debugging failure cases difficult.
Change-Id: Idfabf74d2b3f7b8256f79dff8c6b7fcdc2fcf4d3
diff --git a/internal/ceres/line_search_direction.cc b/internal/ceres/line_search_direction.cc
index ced8da8..0230e8d 100644
--- a/internal/ceres/line_search_direction.cc
+++ b/internal/ceres/line_search_direction.cc
@@ -251,8 +251,13 @@
// Part II: Implementation and experiments, Management Science,
// 20(5), 863-874, 1974.
// [2] Nocedal J., Wright S., Numerical Optimization, Springer, 1999.
- inverse_hessian_ *=
+ const double approximate_eigenvalue_scale =
delta_x_dot_delta_gradient / delta_gradient.dot(delta_gradient);
+ inverse_hessian_ *= approximate_eigenvalue_scale;
+
+ VLOG(4) << "Applying approximate_eigenvalue_scale: "
+ << approximate_eigenvalue_scale << " to initial inverse "
+ << "Hessian approximation.";
}
initialized_ = true;
