perm_operations.h

强化学习算法（R-Learning）难得的珍贵资料

// Copyright (C) 2003 Zbigniew Leyk ([e-mail])
//                and David E. Stewart ([e-mail])
//                and Ronan Collobert ([e-mail])
//                
// This file is part of Torch 3.
//
// All rights reserved.
// 
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// modification, are permitted provided that the following conditions
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#ifndef PERM_OPERATIONS_INC
#define PERM_OPERATIONS_INC

#include "Perm.h"
#include "Mat.h"
#include "Vec.h"

namespace Torch {

/** Collection of permutations operation functions.
    Based on the "Meschach Library", available at the
    anonymous ftp site thrain.anu.edu.au in the directory
    pub/meschach.

    @author David E. Stewart ([e-mail])
    @author Zbigniew Leyk ([e-mail])
    @author Ronan Collobert ([e-mail])
*/
//@{
/** Invert permutation -- in situ.
    Taken from ACM Collected Algorithms 250. */
void mxPermInv(Perm * px, Perm * out);

/** Permutation multiplication (composition) -- not in-situ */
void mxPermMulPerm(Perm * px1, Perm * px2, Perm * out);

/** Permute vector -- can be in-situ */
void mxPermVec(Perm * px, Vec * vec, Vec * out);

/** Apply the inverse of px to x, returning the result in out.
    Can be in-situ, but "oh booooy!"... */
void mxPermInvVec(Perm * px, Vec * x, Vec * out);

/** Transpose elements of permutation.
    Really multiplying a permutation by a transposition.
    i1 and i2 are the elements to transpose. */
void mxTrPerm(Perm * px, int i1, int i2);

/** Permute columns of matrix A; out = A.px'. -- May NOT be in situ */
void mxPermColsMat(Perm * px, Mat * mat, Mat * out);

/** Permute rows of matrix A; out = px.A. -- May NOT be in situ */
void mxPermRowsMat(Perm * px, Mat * mat, Mat * out);

//@}


}

#endif