Add a line search based minimizer.
1. Add a line search based minimization loop.
2. Currently this loop supports steepest descent and three
kinds of non-linear conjugate gradient algorithms.
3. Update SolverImpl to talk to LineSearchMinimizer.
4. Update IterationCallback to carry information about
line search.
5. Update LineSearch to take the initial point as input,
saving on one function evaluation.
6. Updates to the external API.
Change-Id: I901a0e89fc948451ab34c743e70f3dec57c9405e
diff --git a/internal/ceres/line_search_minimizer.h b/internal/ceres/line_search_minimizer.h
new file mode 100644
index 0000000..a9556fd
--- /dev/null
+++ b/internal/ceres/line_search_minimizer.h
@@ -0,0 +1,59 @@
+// Ceres Solver - A fast non-linear least squares minimizer
+// Copyright 2012 Google Inc. All rights reserved.
+// http://code.google.com/p/ceres-solver/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+// * Redistributions of source code must retain the above copyright notice,
+// this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above copyright notice,
+// this list of conditions and the following disclaimer in the documentation
+// and/or other materials provided with the distribution.
+// * Neither the name of Google Inc. nor the names of its contributors may be
+// used to endorse or promote products derived from this software without
+// specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+// POSSIBILITY OF SUCH DAMAGE.
+//
+// Author: sameeragarwal@google.com (Sameer Agarwal)
+
+#ifndef CERES_INTERNAL_LINE_SEARCH_MINIMIZER_H_
+#define CERES_INTERNAL_LINE_SEARCH_MINIMIZER_H_
+
+#include "ceres/minimizer.h"
+#include "ceres/solver.h"
+#include "ceres/types.h"
+
+namespace ceres {
+namespace internal {
+
+// Generic line search minimization algorithm.
+//
+// For example usage, see SolverImpl::Minimize.
+class LineSearchMinimizer : public Minimizer {
+ public:
+ ~LineSearchMinimizer() {}
+ virtual void Minimize(const Minimizer::Options& options,
+ double* parameters,
+ Solver::Summary* summary);
+
+ private:
+ void Init(const Minimizer::Options& options);
+ CallbackReturnType RunCallbacks(const IterationSummary& iteration_summary);
+ Minimizer::Options options_;
+};
+
+} // namespace internal
+} // namespace ceres
+#endif // CERES_INTERNAL_LINE_SEARCH_MINIMIZER_H_
