text: /*
  * BSD 3-Clause License
  *
  * Copyright (c) 2017, Shogun-Toolbox e.V. <shogun-team@shogun-toolbox.org>
  * All rights reserved.
  *
  * 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 the copyright holder 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 HOLDER 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.
  *
  * Written (W) 2017 Giovanni De Toni
  *
  */
  #include <shogun/lib/config.h>
  #ifdef HAVE_TFLOGGER
  
  #ifndef SHOGUN_PARAMETEROBSERVERHISTOGRAM_H
  #define SHOGUN_PARAMETEROBSERVERHISTOGRAM_H
  
  #include <shogun/base/SGObject.h>
  #include <shogun/lib/observers/ParameterObserverTensorBoard.h>
  
  namespace shogun
  {
  	/**
  	 * Implementation of a ParameterObserver which write to file
  	 * histograms, given object emitted from a parameter observable.
  	 */
  	class ParameterObserverHistogram : public ParameterObserverTensorBoard
  	{
  
  	public:
  		ParameterObserverHistogram();
  		ParameterObserverHistogram(std::vector<std::string>& parameters);
  		ParameterObserverHistogram(
  		    const std::string& filename, std::vector<std::string>& parameters);
  		~ParameterObserverHistogram();
  
  		virtual void on_error(std::exception_ptr);
  		virtual void on_complete();
  
  		/**
  		* Get class name.
  		* @return class name
  		*/
  		virtual const char* get_name() const
  		{
  			return "ParameterObserverHistogram";
  		}
  
  	protected:
  		virtual void on_next_impl(const TimedObservedValue& value);
  	};
  }
  
  #endif // SHOGUN_PARAMETEROBSERVERHISTOGRAM_H
  #endif // HAVE_TFLOGGER
  