src/minimizers/PRCG.cpp

/*
 * Copyright (c) 2005 The University of Notre Dame. All Rights Reserved.
 *
 * The University of Notre Dame grants you ("Licensee") a
 * non-exclusive, royalty free, license to use, modify and
 * redistribute this software in source and binary code form, 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 "AS IS," without a warranty of any
 * kind. All express or implied conditions, representations and
 * warranties, including any implied warranty of merchantability,
 * fitness for a particular purpose or non-infringement, are hereby
 * excluded.  The University of Notre Dame and its licensors shall not
 * be liable for any damages suffered by licensee as a result of
 * using, modifying or distributing the software or its
 * derivatives. In no event will the University of Notre Dame or its
 * licensors be liable for any lost revenue, profit or data, or for
 * direct, indirect, special, consequential, incidental or punitive
 * damages, however caused and regardless of the theory of liability,
 * arising out of the use of or inability to use software, even if the
 * University of Notre Dame has been advised of the possibility of
 * such damages.
 *
 * SUPPORT OPEN SCIENCE!  If you use OpenMD or its source code in your
 * research, please cite the appropriate papers when you publish your
 * work.  Good starting points are:
 *                                                                      
 * [1]  Meineke, et al., J. Comp. Chem. 26, 252-271 (2005).             
 * [2]  Fennell & Gezelter, J. Chem. Phys. 124, 234104 (2006).          
 * [3]  Sun, Lin & Gezelter, J. Chem. Phys. 128, 24107 (2008).          
 * [4]  Vardeman & Gezelter, in progress (2009).                        
 */
 
#include "minimizers/PRCG.hpp"
#ifdef IS_MPI
#include <mpi.h>
#endif

namespace OpenMD {
        
  void PRCGMinimizer::init(){

    calcG();
  
    for(int i = 0; i < direction.size(); i++){    
      direction[i] = -curG[i];
    }

  }

  int PRCGMinimizer::step(){
    int lsStatus;
  
    prevF = curF;
    prevG = curG;
    prevX = curX;

    //optimize along the search direction and reset minimum point value
    lsStatus = doLineSearch(direction, stepSize);

    if (lsStatus < 0)
      return -1;
    else
      return 1;
  }

  void PRCGMinimizer::prepareStep(){
    std::vector<RealType> deltaGrad;
    RealType beta;
    size_t i;

    deltaGrad.resize(ndim);
    
    //calculate the new direction using Polak-Ribiere Conjugate Gradient
  
    for(i = 0; i < curG.size(); i++)
      deltaGrad[i] = curG[i] - prevG[i];

#ifndef IS_MPI
    beta = dotProduct(deltaGrad, curG) / dotProduct(prevG, prevG);
#else
    RealType localDP1;
    RealType localDP2;
    RealType globalDP1;
    RealType globalDP2;

    localDP1 =  dotProduct(deltaGrad, curG);
    localDP2 = dotProduct(prevG, prevG);

    MPI_Allreduce(&localDP1, &globalDP1, 1, MPI_REALTYPE,MPI_SUM, MPI_COMM_WORLD);
    MPI_Allreduce(&localDP2, &globalDP2, 1, MPI_REALTYPE,MPI_SUM, MPI_COMM_WORLD);
  
    beta = globalDP1 / globalDP2;
#endif

    for(i = 0; i < direction.size(); i++)  
      direction[i] = -curG[i] + beta * direction[i];

  }

}
Revision:	1627
Committed:	Tue Sep 13 22:05:04 2011 UTC (13 years, 7 months ago) by gezelter
File size:	3528 byte(s)
Log Message:	Splitting out ifstrstream into a header and an implementation. This means that much of the code that depends on it can be compiled only once and the parallel I/O is concentrated into a few files. To do this, a number of files that relied on basic_ifstrstream to load the mpi header had to be modified to manage their own headers.
#	Content
1	/*
2	* Copyright (c) 2005 The University of Notre Dame. All Rights Reserved.
3	*
4	* The University of Notre Dame grants you ("Licensee") a
5	* non-exclusive, royalty free, license to use, modify and
6	* redistribute this software in source and binary code form, provided
7	* that the following conditions are met:
8	*
9	* 1. Redistributions of source code must retain the above copyright
10	* notice, this list of conditions and the following disclaimer.
11	*
12	* 2. Redistributions in binary form must reproduce the above copyright
13	* notice, this list of conditions and the following disclaimer in the
14	* documentation and/or other materials provided with the
15	* distribution.
16	*
17	* This software is provided "AS IS," without a warranty of any
18	* kind. All express or implied conditions, representations and
19	* warranties, including any implied warranty of merchantability,
20	* fitness for a particular purpose or non-infringement, are hereby
21	* excluded. The University of Notre Dame and its licensors shall not
22	* be liable for any damages suffered by licensee as a result of
23	* using, modifying or distributing the software or its
24	* derivatives. In no event will the University of Notre Dame or its
25	* licensors be liable for any lost revenue, profit or data, or for
26	* direct, indirect, special, consequential, incidental or punitive
27	* damages, however caused and regardless of the theory of liability,
28	* arising out of the use of or inability to use software, even if the
29	* University of Notre Dame has been advised of the possibility of
30	* such damages.
31	*
32	* SUPPORT OPEN SCIENCE! If you use OpenMD or its source code in your
33	* research, please cite the appropriate papers when you publish your
34	* work. Good starting points are:
35	*
36	* [1] Meineke, et al., J. Comp. Chem. 26, 252-271 (2005).
37	* [2] Fennell & Gezelter, J. Chem. Phys. 124, 234104 (2006).
38	* [3] Sun, Lin & Gezelter, J. Chem. Phys. 128, 24107 (2008).
39	* [4] Vardeman & Gezelter, in progress (2009).
40	*/
41
42	#include "minimizers/PRCG.hpp"
43	#ifdef IS_MPI
44	#include <mpi.h>
45	#endif
46
47	namespace OpenMD {
48
49	void PRCGMinimizer::init(){
50
51	calcG();
52
53	for(int i = 0; i < direction.size(); i++){
54	direction[i] = -curG[i];
55	}
56
57	}
58
59	int PRCGMinimizer::step(){
60	int lsStatus;
61
62	prevF = curF;
63	prevG = curG;
64	prevX = curX;
65
66	//optimize along the search direction and reset minimum point value
67	lsStatus = doLineSearch(direction, stepSize);
68
69	if (lsStatus < 0)
70	return -1;
71	else
72	return 1;
73	}
74
75	void PRCGMinimizer::prepareStep(){
76	std::vector<RealType> deltaGrad;
77	RealType beta;
78	size_t i;
79
80	deltaGrad.resize(ndim);
81
82	//calculate the new direction using Polak-Ribiere Conjugate Gradient
83
84	for(i = 0; i < curG.size(); i++)
85	deltaGrad[i] = curG[i] - prevG[i];
86
87	#ifndef IS_MPI
88	beta = dotProduct(deltaGrad, curG) / dotProduct(prevG, prevG);
89	#else
90	RealType localDP1;
91	RealType localDP2;
92	RealType globalDP1;
93	RealType globalDP2;
94
95	localDP1 = dotProduct(deltaGrad, curG);
96	localDP2 = dotProduct(prevG, prevG);
97
98	MPI_Allreduce(&localDP1, &globalDP1, 1, MPI_REALTYPE,MPI_SUM, MPI_COMM_WORLD);
99	MPI_Allreduce(&localDP2, &globalDP2, 1, MPI_REALTYPE,MPI_SUM, MPI_COMM_WORLD);
100
101	beta = globalDP1 / globalDP2;
102	#endif
103
104	for(i = 0; i < direction.size(); i++)
105	direction[i] = -curG[i] + beta * direction[i];
106
107	}
108
109	}