/usr/include/linbox/vector/stream.h is in liblinbox-dev 1.4.2-5build1.
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* Copyright (C) 2002 Bradford Hovinen
*
* Written by Bradford Hovinen <hovinen@cis.udel.edu>
*
* ------------------------------------
* 2003-02-03 Bradford Hovinen <bghovinen@math.uwaterloo.ca>
*
* RandomSparseStream::RandomSparseStream: put probability parameter before
* vector dimension
* ------------------------------------
* 2002-09-05 Bradford Hovinen <bghovine@math.uwaterloo.ca>
*
* - Renamed to stream.h and moved to linbox/vector
* - VectorFactory is now called VectorStream, which fits its purpose
* somewhat better
* - The interface is now closer to the interface for istream
* - RandomDenseVectorFactory, et al. are refactored into classes
* parameterized on the vector type and specialized appropriately. This
* allows, e.g. construction of a random dense vector in sparse
* representation and so on.
* - New constructor interface for RandomSparseStream accepts proportion of
* nonzero entries; removed existing constructors
* - Reindented, since the other changes are so numerous that diffs aren't a
* big deal anyway
*
* ------------------------------------
* 2002-05-18 Bradford Hovinen <hovinen@cis.udel.edu>
*
* Refactor: Create one class StandardBasisFactory, parameterized by vector
* type, with specializations for dense, sparse map, and sparse associative
* vectors.
*
* ------------------------------------
* Modified by Dmitriy Morozov <linbox@foxcub.org>. May 27, 2002.
*
* Added parametrization of the VectorCategroy tags by VectorTraits (see
* vector-traits.h for more details).
*
* ------------------------------------
*
*
* ========LICENCE========
* This file is part of the library LinBox.
*
* LinBox is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
* ========LICENCE========
*.
*/
/**
* @file vector/stream.h
*
* @brief Generation of sequences of random vectors.
*
* Random, sparse, basis vectors,...
*/
#ifndef __LINBOX_vector_stream_H
#define __LINBOX_vector_stream_H
#include <givaro/givranditer.h>
#include "linbox/util/debug.h"
#include "linbox/randiter/mersenne-twister.h"
#include "linbox/vector/vector-traits.h"
#include <vector>
#include <cmath>
// stream
namespace LinBox
{
/** \brief Vector factory.
* This is an abstract base class that generates a sequence of vectors
* in a generic way. Typical uses would be in tests, where the same test
* might be run on a sequence of random vectors or on e_1, ..., e_n.
\ingroup vector
*/
template <class _Vector>
class VectorStream {
public:
typedef _Vector Vector;
typedef VectorStream<Vector> Self_t;
virtual ~VectorStream () {}
/** Get the next vector from the factory and store it in v
*/
virtual Vector &get (Vector &v) = 0;
/** Extraction operator form
*/
Self_t &operator >> (Vector &v)
{ get (v); return *this; }
/** Get the number of vectors to be constructed in this stream
*/
virtual size_t size () const = 0;
/** Get the number of vectors constructed so far
*/
virtual size_t pos () const = 0;
/** Get the dimension of each vector
*/
virtual size_t dim () const = 0;
/** Return true if and only if the vector stream still has more vectors
* to construct
*/
virtual operator bool () const = 0;
/** Reset the vector stream to the beginning.
*/
virtual void reset () = 0;
/** Alias for reset
*/
void rewind () { reset (); }
/** @name Legacy interface
* These functions provide compatiblity with older parts of the
* library. Their use is deprecated.
*/
//@{
Vector &next (Vector &v) { return get (v); }
size_t j () const { return pos (); }
size_t m () const { return size (); }
size_t n () const { return dim (); }
//@}
};
/** @brief Constant vector factory.
* Returns the same vector repeatedly
*/
template <class _Vector>
class ConstantVectorStream : public VectorStream<_Vector> {
public:
typedef _Vector Vector;
typedef ConstantVectorStream<Vector> Self_t;
/** Constructor.
* Construct a new factory with the given field and vector size.
* @param v Vector to return on next
* @param m Number of vectors to return (0 for unlimited)
*/
ConstantVectorStream (Vector &v, size_t m) :
_v (v), _m (m), _j (0)
{}
/** Retrieve vector
* @param v Vector to use
*/
Vector &get (Vector &v)
{
if (_m == 0 || _j < _m)
std::copy (_v.begin (), _v.end (), v.begin ());
#ifdef _LB_DEBUG
else {
std::cerr << "Vector stream: nothing to get" << std::endl;
}
#endif
return v; }
/** Extraction operator form
*/
Self_t &operator >> (Vector &v)
{ get (v); return *this; }
/** Number of vectors to be created
*/
size_t size () const { return _m; }
/** Number of vectors created so far
*/
size_t pos () const { return _j; }
/** Dimension of the space
*/
size_t dim () const { return _v.size (); }
/** Check whether we have reached the end
*/
operator bool () const { return _m == 0 || _j < _m; }
/** Reset the factory to start at the beginning
*/
void reset () { _j = 0; }
private:
Vector &_v;
size_t _m;
size_t _j;
};
}
// #include "linbox/vector/blas-vector.h"
// Dense
namespace LinBox
{
template<class _Field, class _Rep> class BlasVector ;
/** @brief Random dense vector stream.
* Generates a sequence of random dense vectors over a given field
*/
template <typename Field, typename _Vector = BlasVector<Field, typename Vector<Field>::Dense>,
class RandIter = typename Field::RandIter,
class Trait = typename VectorTraits<_Vector>::VectorCategory>
class RandomDenseStream : public VectorStream<_Vector> {
public:
typedef _Vector Vector;
typedef RandomDenseStream<Field, Vector, RandIter, Trait> Self_t;
/** Constructor.
* Construct a new stream with the given field and vector size.
* @param F Field over which to create random vectors
* @param r
* @param n Size of vectors
* @param m Number of vectors to return (0 for unlimited)
*/
RandomDenseStream (const Field &F, RandIter &r, size_t n, size_t m = 0);
/** Get next element
* @param v Vector into which to generate random vector
* @return reference to new random vector
*/
Vector &get (Vector &v);
/** Extraction operator form
*/
Self_t &operator >> (Vector &v)
{ get (v); return *this; }
/** Number of vectors to be created
*/
size_t size () const;
/** Number of vectors created so far
*/
size_t pos () const;
/** Dimension of the space
*/
size_t dim () const;
/** Check whether we have reached the end
*/
operator bool () const;
/** Reset the stream to start at the beginning
*/
void reset ();
};
//! Specialization of random dense stream for dense vectors
template <class Field, class _Vector, class RandIter>
class RandomDenseStream<Field, _Vector, RandIter, VectorCategories::DenseVectorTag > : public VectorStream<_Vector> {
public:
typedef _Vector Vector;
typedef RandomDenseStream<Field, Vector, RandIter, VectorCategories::DenseVectorTag > Self_t;
RandomDenseStream (const Field &F, RandIter &r, size_t nn, size_t mm = 0) :
_field (F), _r (r), _n (nn), _m (mm), _j (0)
{}
Vector &get (Vector &v)
{
typename Vector::iterator i;
if ( (_m > 0) && (_j++ >= _m) )
return v;
for (i = v.begin (); i != v.end (); ++i)
_r.random (*i);
return v;
}
/** Extraction operator form
*/
Self_t &operator >> (Vector &v)
{ get (v); return *this; }
size_t size () const { return _m; }
size_t pos () const { return _j; }
size_t dim () const { return _n; }
operator bool () const { return _m == 0 || _j < _m; }
void reset () { _j = 0; }
private:
const Field &_field;
RandIter & _r;
size_t _n;
size_t _m;
size_t _j;
};
}
#include "linbox/vector/sparse.h"
//Sparse
namespace LinBox
{
/** @brief Random sparse vector stream.
* Generates a sequence of random sparse vectors over a given field
*/
template <class Field, class _Vector = Sparse_Vector<typename Field::Element>, class RandIter = typename Field::RandIter, class Trait = typename VectorTraits<_Vector>::VectorCategory>
class RandomSparseStream : public VectorStream<_Vector> {
public:
typedef _Vector Vector;
typedef RandomSparseStream<Field, Vector, RandIter, Trait > Self_t;
/** Constructor.
* Construct a new stream with the given field and vector size.
* @param F Field over which to create random vectors
* @param r
* @param n Size of vectors
* @param p Proportion of nonzero entries
* @param m Number of vectors to return (0 for unlimited)
* @param seed
*/
RandomSparseStream (const Field &F, RandIter &r, double p, size_t n, size_t m = 0, int seed=(int)time (NULL));
/** Get next element
* @param v Vector into which to generate random vector
* @return reference to new random vector
*/
Vector &get (Vector &v);
/** Extraction operator form
*/
Self_t &operator >> (Vector &v)
{ get (v); return *this; }
/** Number of vectors to be created
*/
size_t size () const;
/** Number of vectors created so far
*/
size_t pos () const;
/** Dimension of the space
*/
size_t dim () const;
/** Check whether we have reached the end
*/
operator bool () const;
/** Reset the stream to start at the beginning
*/
void reset ();
/** Set the probability of a nonzero entry
*/
void setP (double p);
};
//! Specialization of RandomSparseStream for dense vectors
template <class Field, class _Vector, class RandIter>
class RandomSparseStream<Field, _Vector, RandIter, VectorCategories::DenseVectorTag > : public VectorStream<_Vector> {
public:
typedef _Vector Vector;
typedef RandomSparseStream<Field, Vector, RandIter, VectorCategories::DenseVectorTag > Self_t;
RandomSparseStream (const Field &F, RandIter &r, double p, size_t n, size_t m = 0, int seed=(int)time (NULL)) :
_field (F), _r1 (r), _r (_r1), _n (n), _p (p), _m (m), _j (0),
MT ((uint32_t)seed)
{
linbox_check ((p >= 0.0) && (p <= 1.0));
}
Vector &get (Vector &v)
{
if (_m > 0 && _j++ >= _m)
return v;
for (typename Vector::iterator i = v.begin (); i != v.end (); ++i) {
double val;
val = MT.randomDouble ();
if (val < _p)
_r.random (*i);
else
_field.assign (*i, _field.zero);
}
return v;
}
/** Extraction operator form
*/
Self_t &operator >> (Vector &v)
{ get (v); return *this; }
size_t size () const { return _m; }
size_t pos () const { return _j; }
size_t dim () const { return _n; }
operator bool () const { return _m == 0 || _j < _m; }
void reset () { _j = 0; }
void setP (double p) { linbox_check ((p >= 0.0) && (p <= 1.0)); _p = p; }
private:
const Field &_field;
RandIter & _r1;
Givaro::GeneralRingNonZeroRandIter<Field, RandIter> _r;
size_t _n;
double _p;
size_t _m;
size_t _j;
MersenneTwister MT;
};
//! Specialization of RandomSparseStream for sparse sequence vectors
template <class Field, class _Vector, class RandIter>
class RandomSparseStream<Field, _Vector, RandIter, VectorCategories::SparseSequenceVectorTag > : public VectorStream<_Vector> {
public:
typedef RandomSparseStream<Field, _Vector, RandIter, VectorCategories::SparseSequenceVectorTag > Self_t;
typedef _Vector Vector;
RandomSparseStream (const Field &F, RandIter &r, double p,
size_t N, size_t M = 0, int seed=(int)time (NULL)) :
_field (F),
_r1 (r),
_r (r),
_n (N),
_p (p),
_m (M),
_j (0),
MT ((uint32_t)seed)
{ setP (p); }
Vector &get (Vector &v)
{
typename Field::Element x;
size_t i = (size_t) -1;
if (_m > 0 && _j++ >= _m)
return v;
v.clear ();
while (1) {
double val;
int skip;
val = MT.randomDouble ();
skip = (int) (ceil (log (val) * _1_log_1mp));
if (skip <= 0)
++i;
else
i += (size_t)skip;
if (i >= _n) break;
_r.random (x);
v.push_back (std::pair<size_t, typename Field::Element> (i, x));
}
return v;
}
/** Extraction operator form
*/
Self_t &operator >> (Vector &v)
{ get (v); return *this; }
size_t size () const { return _m; }
size_t pos () const { return _j; }
size_t dim () const { return _n; }
operator bool () const { return _m == 0 || _j < _m; }
void reset () { _j = 0; }
void setP (double p)
{
linbox_check ((p >= 0.0) && (p <= 1.0));
_p = p;
_1_log_1mp = 1 / log (1 - _p);
}
private:
const Field &_field;
RandIter & _r1;
Givaro::GeneralRingNonZeroRandIter<Field, RandIter> _r;
size_t _n;
double _p;
double _1_log_1mp;
size_t _m;
size_t _j;
MersenneTwister MT;
};
//! Specialization of RandomSparseStream for sparse associative vectors
template <class Field, class _Vector, class RandIter>
class RandomSparseStream<Field, _Vector, RandIter, VectorCategories::SparseAssociativeVectorTag > : public VectorStream<_Vector> {
public:
typedef _Vector Vector;
typedef RandomSparseStream<Field, Vector, RandIter, VectorCategories::SparseAssociativeVectorTag > Self_t;
RandomSparseStream (const Field &F, RandIter &r, double p, size_t N,
size_t M = 0, int seed=(int)time (NULL)) :
_field (F), _r1 (r), _r (_r1), _n (N), _k ((long) (p * N)), _j (0), _m (M),
MT ((uint32_t) seed)
{}
Vector &get (Vector &v)
{
typename Field::Element x;
int i;
if (_m > 0 && _j++ >= _m)
return v;
v.clear ();
for (i = 0; i < _k; ++i) {
size_t idx;
_r.random (x);
while (!_field.isZero (v[idx = MT.randomIntRange (0, (uint32_t)_n)])) ;
v[idx] = x;
}
return v;
}
/** Extraction operator form
*/
Self_t &operator >> (Vector &v)
{ get (v); return *this; }
size_t size () const { return _m; }
size_t pos () const { return _j; }
size_t dim () const { return _n; }
operator bool () const { return _m == 0 || _j < _m; }
void reset () { _j = 0; }
void setP (double p) { _k = (long) (p * _n); }
private:
const Field &_field;
RandIter & _r1;
Givaro::GeneralRingNonZeroRandIter<Field, RandIter> _r;
size_t _n;
long _k;
size_t _j;
size_t _m;
MersenneTwister MT;
};
//! Specialization of RandomSparseStream for sparse parallel vectors
template <class Field, class _Vector, class RandIter>
class RandomSparseStream<Field, _Vector, RandIter, VectorCategories::SparseParallelVectorTag > : public VectorStream<_Vector> {
public:
typedef _Vector Vector;
typedef RandomSparseStream<Field, Vector, RandIter, VectorCategories::SparseParallelVectorTag > Self_t;
RandomSparseStream (const Field &F, RandIter &r, double p, size_t nn, size_t mm = 0, int seed=(int)time (NULL)) :
_field (F), _r1 (r), _r (_r1), _n (nn), _m (mm), _j (0),
MT ((uint32_t)seed)
{ setP (p); }
Vector &get (Vector &v)
{
typename Field::Element x;
size_t i = (size_t) -1;
if (_m > 0 && _j++ >= _m)
return v;
v.first.clear ();
v.second.clear ();
while (1) {
double val;
int skip;
val = MT.randomDouble ();
skip = (int) (ceil (log (val) * _1_log_1mp));
if (skip <= 0)
++i;
else
i += (size_t) skip;
if (i >= _n) break;
_r.random (x);
v.first.push_back (i);
v.second.push_back (x);
}
return v;
}
/** Extraction operator form
*/
Self_t &operator >> (Vector &v)
{ get (v); return *this; }
size_t size () const { return _m; }
size_t pos () const { return _j; }
size_t dim () const { return _n; }
operator bool () const { return _m == 0 || _j < _m; }
void reset () { _j = 0; }
void setP (double p)
{
linbox_check ((p >= 0.0) && (p <= 1.0));
_p = p;
_1_log_1mp = 1 / log (1 - _p);
}
private:
const Field &_field;
RandIter & _r1;
Givaro::GeneralRingNonZeroRandIter<Field, RandIter> _r;
size_t _n;
double _p;
double _1_log_1mp;
size_t _m;
size_t _j;
MersenneTwister MT;
};
}
// standard basis
namespace LinBox
{
/** @brief Stream for \f$e_1,\cdots,e_n\f$.
* Generates the sequence (e_1,...,e_n) over a given field
*
* This class is generic with respect to the underlying vector
* representation.
*/
template <class Field, class _Vector, class Trait = typename VectorTraits<_Vector>::VectorCategory>
class StandardBasisStream : public VectorStream<_Vector> {
public:
typedef _Vector Vector;
typedef StandardBasisStream<Field, Vector, Trait > Self_t;
/** Constructor.
* Construct a new stream with the given field and vector size.
* @param F Field over which to create vectors
* @param n Size of vectors
*/
StandardBasisStream (Field &F, size_t n);
/** Get next element
* @param v Vector into which to generate vector
* @return reference to new vector
*/
Vector &get (Vector &v);
/** Extraction operator form
*/
Self_t &operator >> (Vector &v)
{ get (v); return *this; }
/** Number of vectors to be created
*/
size_t size () const;
/** Number of vectors created so far
*/
size_t pos () const;
/** Dimension of the space
*/
size_t dim () const;
/** Check whether we have reached the end
*/
operator bool () const;
/** Reset the stream to start at the beginning
*/
void reset ();
private:
const Field &_field;
size_t _n;
size_t _j;
};
//! Specialization of standard basis stream for dense vectors
template <class Field, class _Vector>
class StandardBasisStream<Field, _Vector, VectorCategories::DenseVectorTag > : public VectorStream<_Vector> {
public:
typedef _Vector Vector;
typedef StandardBasisStream<Field, Vector, VectorCategories::DenseVectorTag > Self_t;
StandardBasisStream (const Field &F, size_t N) :
_field (F), _n (N), _j (0)
{}
Vector &get (Vector &v)
{
typename Vector::iterator i;
size_t idx;
for (i = v.begin (), idx = 0; i != v.end (); ++i, ++idx) {
if (idx == _j)
_field.assign(*i, _field.one);
else
_field.assign (*i, _field.zero);
}
++_j;
return v;
}
/** Extraction operator form
*/
Self_t &operator >> (Vector &v)
{
get (v);
return *this;
}
size_t size () const { return _n; }
size_t pos () const { return _j; }
size_t dim () const { return _n; }
operator bool () const { return _j < _n; }
void reset () { _j = 0; }
private:
const Field &_field;
size_t _n;
size_t _j;
};
//! Specialization of standard basis stream for sparse sequence vectors
template <class Field, class _Vector>
class StandardBasisStream<Field, _Vector, VectorCategories::SparseSequenceVectorTag > : public VectorStream<_Vector> {
public:
typedef _Vector Vector;
typedef StandardBasisStream<Field, Vector, VectorCategories::SparseSequenceVectorTag > Self_t;
StandardBasisStream (Field &F, size_t N) :
_field (F), _n (N), _j (0)
{
}
Vector &get (Vector &v)
{
v.clear ();
if (_j < _n)
v.push_back (std::pair <size_t, typename Field::Element> (_j++, _field.one));
return v;
}
/** Extraction operator form
*/
Self_t &operator >> (Vector &v)
{ get (v); return *this; }
size_t size () const { return _n; }
size_t pos () const { return _j; }
size_t dim () const { return _n; }
operator bool () const { return _j < _n; }
void reset () { _j = 0; }
private:
const Field &_field;
size_t _n;
size_t _j;
};
//! Specialization of standard basis stream for sparse associative vectors
template <class Field, class _Vector>
class StandardBasisStream<Field, _Vector, VectorCategories::SparseAssociativeVectorTag > : public VectorStream<_Vector> {
public:
typedef _Vector Vector;
typedef StandardBasisStream<Field, Vector, VectorCategories::SparseAssociativeVectorTag > Self_t;
StandardBasisStream (Field &F, size_t N) :
_field (F), _n (N), _j (0)
{
}
Vector &get (Vector &v)
{
v.clear ();
if (_j < _n)
v.insert (std::pair <size_t, typename Field::Element> (_j++, _field.one));
return v;
}
/** Extraction operator form
*/
Self_t &operator >> (Vector &v)
{ get (v); return *this; }
size_t pos () const { return _j; }
size_t size () const { return _n; }
size_t dim () const { return _n; }
operator bool () const { return _j < _n; }
void reset () { _j = 0; }
private:
const Field &_field;
size_t _n;
size_t _j;
};
//! Specialization of standard basis stream for sparse parallel vectors
template <class Field, class _Vector>
class StandardBasisStream<Field, _Vector, VectorCategories::SparseParallelVectorTag > : public VectorStream<_Vector> {
public:
typedef _Vector Vector;
typedef StandardBasisStream<Field, Vector, VectorCategories::SparseParallelVectorTag> Self_t;
StandardBasisStream (Field &F, size_t N) :
_field (F), _n (N), _j (0)
{ }
Vector &get (Vector &v)
{
v.first.clear ();
v.second.clear ();
if (_j < _n) {
v.first.push_back (_j++);
v.second.push_back (_field.one);
}
return v;
}
/** Extraction operator form
*/
Self_t &operator >> (Vector &v)
{ get (v); return *this; }
size_t size () const { return _n; }
size_t pos () const { return _j; }
size_t dim () const { return _n; }
operator bool () const { return _j < _n; }
void reset () { _j = 0; }
private:
const Field &_field;
size_t _n;
size_t _j;
};
} // namespace LinBox
#include "linbox/vector/stream-gf2.h"
#endif // __LINBOX_vector_stream_H
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