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StreamingDenseFeatures.cpp
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StreamingDenseFeatures.cpp
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/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* Written (W) 2011 Shashwat Lal Das
* Written (W) 2012 Heiko Strathmann
* Copyright (C) 2011 Berlin Institute of Technology and Max-Planck-Society
*/
#include <shogun/mathematics/Math.h>
#include <shogun/features/streaming/StreamingDenseFeatures.h>
#include <shogun/io/streaming/StreamingFileFromDenseFeatures.h>
namespace shogun
{
template<class T>
CStreamingDenseFeatures<T>::CStreamingDenseFeatures() :
CStreamingDotFeatures()
{
set_read_functions();
init();
parser.set_free_vector_after_release(false);
}
template<class T>
CStreamingDenseFeatures<T>::CStreamingDenseFeatures(CStreamingFile* file,
bool is_labelled, int32_t size) :
CStreamingDotFeatures()
{
init(file, is_labelled, size);
set_read_functions();
parser.set_free_vector_after_release(false);
}
template<class T> CStreamingDenseFeatures<T>::CStreamingDenseFeatures(
CDenseFeatures<T>* dense_features, float64_t* lab) :
CStreamingDotFeatures()
{
REQUIRE(dense_features, "%s::CStreamingDenseFeatures(): Features needed!\n")
CStreamingFileFromDenseFeatures<T>* file;
bool is_labelled;
int32_t size=1024;
is_labelled=lab;
file=new CStreamingFileFromDenseFeatures<T>(dense_features, lab);
init(file, is_labelled, size);
set_read_functions();
parser.set_free_vector_after_release(false);
parser.set_free_vectors_on_destruct(false);
seekable=true;
}
template<class T> CStreamingDenseFeatures<T>::~CStreamingDenseFeatures()
{
SG_DEBUG("entering %s::~CStreamingDenseFeatures()\n", get_name())
/* needed to prevent double free memory errors */
current_vector.vector=NULL;
current_vector.vlen=0;
SG_DEBUG("leaving %s::~CStreamingDenseFeatures()\n", get_name())
}
template<class T> void CStreamingDenseFeatures<T>::reset_stream()
{
if (seekable)
{
((CStreamingFileFromDenseFeatures<T>*)working_file)->reset_stream();
if (parser.is_running())
parser.end_parser();
parser.exit_parser();
parser.init(working_file, has_labels, 1);
parser.set_free_vector_after_release(false);
parser.set_free_vectors_on_destruct(false);
parser.start_parser();
}
}
template<class T> float32_t CStreamingDenseFeatures<T>::dense_dot(
const float32_t* vec2, int32_t vec2_len)
{
ASSERT(vec2_len==current_vector.vlen)
float32_t result=0;
for (int32_t i=0; i<current_vector.vlen; i++)
result+=current_vector[i]*vec2[i];
return result;
}
template<class T> float64_t CStreamingDenseFeatures<T>::dense_dot(
const float64_t* vec2, int32_t vec2_len)
{
ASSERT(vec2_len==current_vector.vlen)
float64_t result=0;
for (int32_t i=0; i<current_vector.vlen; i++)
result+=current_vector[i]*vec2[i];
return result;
}
template<class T> void CStreamingDenseFeatures<T>::add_to_dense_vec(
float32_t alpha, float32_t* vec2, int32_t vec2_len, bool abs_val)
{
ASSERT(vec2_len==current_vector.vlen)
if (abs_val)
{
for (int32_t i=0; i<current_vector.vlen; i++)
vec2[i]+=alpha*CMath::abs(current_vector[i]);
}
else
{
for (int32_t i=0; i<current_vector.vlen; i++)
vec2[i]+=alpha*current_vector[i];
}
}
template<class T> void CStreamingDenseFeatures<T>::add_to_dense_vec(
float64_t alpha, float64_t* vec2, int32_t vec2_len, bool abs_val)
{
ASSERT(vec2_len==current_vector.vlen)
if (abs_val)
{
for (int32_t i=0; i<current_vector.vlen; i++)
vec2[i]+=alpha*CMath::abs(current_vector[i]);
}
else
{
for (int32_t i=0; i<current_vector.vlen; i++)
vec2[i]+=alpha*current_vector[i];
}
}
template<class T> int32_t CStreamingDenseFeatures<T>::get_nnz_features_for_vector()
{
return current_vector.vlen;
}
template<class T> int32_t CStreamingDenseFeatures<T>::get_num_vectors() const
{
return 1;
}
template<class T>
void CStreamingDenseFeatures<T>::set_vector_reader()
{
parser.set_read_vector(&CStreamingFile::get_vector);
}
template<class T>
void CStreamingDenseFeatures<T>::set_vector_and_label_reader()
{
parser.set_read_vector_and_label(&CStreamingFile::get_vector_and_label);
}
#define GET_FEATURE_TYPE(f_type, sg_type) \
template<> EFeatureType CStreamingDenseFeatures<sg_type>::get_feature_type() const \
{ \
return f_type; \
}
GET_FEATURE_TYPE(F_BOOL, bool)
GET_FEATURE_TYPE(F_CHAR, char)
GET_FEATURE_TYPE(F_BYTE, uint8_t)
GET_FEATURE_TYPE(F_BYTE, int8_t)
GET_FEATURE_TYPE(F_SHORT, int16_t)
GET_FEATURE_TYPE(F_WORD, uint16_t)
GET_FEATURE_TYPE(F_INT, int32_t)
GET_FEATURE_TYPE(F_UINT, uint32_t)
GET_FEATURE_TYPE(F_LONG, int64_t)
GET_FEATURE_TYPE(F_ULONG, uint64_t)
GET_FEATURE_TYPE(F_SHORTREAL, float32_t)
GET_FEATURE_TYPE(F_DREAL, float64_t)
GET_FEATURE_TYPE(F_LONGREAL, floatmax_t)
#undef GET_FEATURE_TYPE
template<class T>
void CStreamingDenseFeatures<T>::init()
{
working_file=NULL;
seekable=false;
/* needed to prevent double free memory errors */
current_vector.vector=NULL;
current_vector.vlen=-1;
set_generic<T>();
}
template<class T>
void CStreamingDenseFeatures<T>::init(CStreamingFile* file, bool is_labelled,
int32_t size)
{
init();
has_labels=is_labelled;
working_file=file;
SG_REF(working_file);
parser.init(file, is_labelled, size);
seekable=false;
}
template<class T>
void CStreamingDenseFeatures<T>::start_parser()
{
if (!parser.is_running())
parser.start_parser();
}
template<class T>
void CStreamingDenseFeatures<T>::end_parser()
{
parser.end_parser();
}
template<class T>
bool CStreamingDenseFeatures<T>::get_next_example()
{
SG_DEBUG("entering\n");
bool ret_value;
ret_value=(bool)parser.get_next_example(current_vector.vector,
current_vector.vlen, current_label);
SG_DEBUG("leaving\n");
return ret_value;
}
template<class T>
SGVector<T> CStreamingDenseFeatures<T>::get_vector()
{
return current_vector;
}
template<class T>
float64_t CStreamingDenseFeatures<T>::get_label()
{
ASSERT(has_labels)
return current_label;
}
template<class T>
void CStreamingDenseFeatures<T>::release_example()
{
parser.finalize_example();
}
template<class T>
int32_t CStreamingDenseFeatures<T>::get_dim_feature_space() const
{
return current_vector.vlen;
}
template<class T>
float32_t CStreamingDenseFeatures<T>::dot(CStreamingDotFeatures* df)
{
ASSERT(df)
ASSERT(df->get_feature_type() == get_feature_type())
ASSERT(df->get_feature_class() == get_feature_class())
CStreamingDenseFeatures<T>* sf=(CStreamingDenseFeatures<T>*)df;
SGVector<T> other_vector=sf->get_vector();
return CMath::dot(current_vector.vector, other_vector.vector, current_vector.vlen);
}
template<class T>
float32_t CStreamingDenseFeatures<T>::dot(SGVector<T> sgvec1)
{
int32_t len1;
len1=sgvec1.vlen;
if (len1!=current_vector.vlen)
SG_ERROR(
"Lengths %d and %d not equal while computing dot product!\n", len1, current_vector.vlen);
return CMath::dot(current_vector.vector, sgvec1.vector, len1);
}
template<class T>
int32_t CStreamingDenseFeatures<T>::get_num_features()
{
return current_vector.vlen;
}
template<class T>
EFeatureClass CStreamingDenseFeatures<T>::get_feature_class() const
{
return C_STREAMING_DENSE;
}
template<class T>
CFeatures* CStreamingDenseFeatures<T>::get_streamed_features(
index_t num_elements)
{
SG_DEBUG("entering\n");
SG_DEBUG("Streaming %d elements\n", num_elements)
REQUIRE(num_elements>0, "Requested number of feature vectors (%d) must be "
"positive\n", num_elements);
/* init matrix empty, as we dont know the dimension yet */
SGMatrix<T> matrix;
for (index_t i=0; i<num_elements; ++i)
{
/* check if we run out of data */
if (!get_next_example())
{
SG_WARNING("Ran out of streaming data, reallocating matrix and "
"returning!\n");
/* allocating space for data so far, not this mighe be 0 bytes */
SGMatrix<T> so_far(matrix.num_rows, i);
/* copy */
sg_memcpy(so_far.matrix, matrix.matrix,
so_far.num_rows*so_far.num_cols*sizeof(T));
matrix=so_far;
break;
}
else
{
/* allocate matrix memory in first iteration */
if (!matrix.matrix)
{
SG_DEBUG("Allocating %dx%d matrix\n",
current_vector.vlen, num_elements);
matrix=SGMatrix<T>(current_vector.vlen, num_elements);
}
/* get an example from stream and copy to feature matrix */
SGVector<T> vec=get_vector();
/* check for inconsistent dimensions */
REQUIRE(vec.vlen==matrix.num_rows,
"Dimension of streamed vector (%d) does not match "
"dimensions of previous vectors (%d)\n",
vec.vlen, matrix.num_rows);
/* copy vector into matrix */
sg_memcpy(&matrix.matrix[current_vector.vlen*i], vec.vector,
vec.vlen*sizeof(T));
/* clean up */
release_example();
}
}
/* create new feature object from collected data */
CDenseFeatures<T>* result=new CDenseFeatures<T>(matrix);
SG_DEBUG("leaving returning %dx%d matrix\n", matrix.num_rows,
matrix.num_cols);
return result;
}
template class CStreamingDenseFeatures<bool> ;
template class CStreamingDenseFeatures<char> ;
template class CStreamingDenseFeatures<int8_t> ;
template class CStreamingDenseFeatures<uint8_t> ;
template class CStreamingDenseFeatures<int16_t> ;
template class CStreamingDenseFeatures<uint16_t> ;
template class CStreamingDenseFeatures<int32_t> ;
template class CStreamingDenseFeatures<uint32_t> ;
template class CStreamingDenseFeatures<int64_t> ;
template class CStreamingDenseFeatures<uint64_t> ;
template class CStreamingDenseFeatures<float32_t> ;
template class CStreamingDenseFeatures<float64_t> ;
template class CStreamingDenseFeatures<floatmax_t> ;
}