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https://github.com/ceres-solver/ceres-solver.git
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Darius Rueckert
13c7a22cee
This patch adds the classes Optimizer and OptimizationPass, which define the core API of the codegen optimization. A single (trivial) optimization is added that removes NOP expressions from a graph. Change-Id: I0430d6ffc61a474f997475ff787a81a9c69cfe23
68 lines
2.7 KiB
C++
68 lines
2.7 KiB
C++
// Ceres Solver - A fast non-linear least squares minimizer
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// Copyright 2020 Google Inc. All rights reserved.
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// http://code.google.com/p/ceres-solver/
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// * Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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// * Neither the name of Google Inc. nor the names of its contributors may be
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// used to endorse or promote products derived from this software without
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// specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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//
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// Author: darius.rueckert@fau.de (Darius Rueckert)
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//
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#ifndef CERES_PUBLIC_CODEGEN_INTERNAL_ELIMINATE_NOPS_H_
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#define CERES_PUBLIC_CODEGEN_INTERNAL_ELIMINATE_NOPS_H_
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#include "ceres/codegen/internal/expression_graph.h"
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#include "ceres/codegen/internal/optimization_pass_summary.h"
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namespace ceres {
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namespace internal {
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// [OptimizationPass] NOP Cleanup
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//
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// Short Description:
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// Removes all expression with type==ExpressionType::NOP.
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//
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// Description:
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// Removing an expression not at the end requires reindexing of all later
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// expressions. Therefore, other optimization passes replace expression with
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// NOP instead of removing them. This optimization pass removes all NOPs back
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// to front.
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// The returned value is equal to the number of removed NOPs.
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//
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// Example:
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// v_0 = 1;
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// // NOP
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// v_2 = 2;
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// v_3 = v_0 + v_2
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// Transforms to:
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// v_0 = 1;
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// v_1 = 2;
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// v_2 = v_0 + v_1;
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OptimizationPassSummary EliminateNops(ExpressionGraph* graph);
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} // namespace internal
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} // namespace ceres
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#endif // CERES_PUBLIC_CODEGEN_INTERNAL_ELIMINATE_NOPS_H_
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