ConstLearningRate.h

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/*
 * Copyright (c) The Shogun Machine Learning Toolbox
 * Written (w) 2015 Wu Lin
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 * 2. 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.
 *
 * 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.
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 */

#ifndef CONSTLEARNINGRATE_H
#define CONSTLEARNINGRATE_H
#include <shogun/optimization/LearningRate.h>
#include <shogun/lib/config.h>

namespace shogun
{
class ConstLearningRate: public LearningRate
{
public:
    ConstLearningRate():LearningRate() { init(); }

    virtual ~ConstLearningRate() {}

    virtual void set_const_learning_rate(float64_t learning_rate)
    {
        REQUIRE(learning_rate>0.0, "learning_rate (%f) must be positive",learning_rate);
        m_const_learning_rate=learning_rate;
    }

    virtual float64_t get_learning_rate(int32_t iter_counter)
    {
        REQUIRE(m_const_learning_rate>0.0,"learning_rate must set\n");
        return m_const_learning_rate;
    }

    virtual void update_context(CMinimizerContext* context)
    {
        REQUIRE(context, "Context must set\n");
    }

    virtual void load_from_context(CMinimizerContext* context)
    {
        REQUIRE(context, "Context must set\n");
    }

protected:

    float64_t m_const_learning_rate;

private:
    void init()
    {
        m_const_learning_rate=0.0;
    }
};

}

#endif