/usr/include/shogun/preprocessor/DecompressString.h is in libshogun-dev 1.1.0-4ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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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) 2009 Soeren Sonnenburg
* Copyright (C) 2009 Berlin Institute of Technology
*/
#ifndef _CDECOMPRESS_STRING__H__
#define _CDECOMPRESS_STRING__H__
#include <shogun/features/Features.h>
#include <shogun/features/StringFeatures.h>
#include <shogun/lib/common.h>
#include <shogun/lib/Compressor.h>
#include <shogun/preprocessor/StringPreprocessor.h>
namespace shogun
{
template <class ST> class CStringFeatures;
class CCompressor;
/** @brief Preprocessor that decompresses compressed strings.
*
* Each string in CStringFeatures might be stored compressed in memory.
* This preprocessor decompresses these strings on the fly. This may be
* especially usefull for long strings and when datasets become too large
* to fit in memoryin uncompressed form but still when they are compressed.
*
* Then avoiding expensive disk i/o strings are on-the-fly decompressed.
*
*/
template <class ST> class CDecompressString : public CStringPreprocessor<ST>
{
public:
/** default constructor */
CDecompressString();
/** constructor
*/
CDecompressString(E_COMPRESSION_TYPE ct);
/** destructor */
virtual ~CDecompressString();
/// initialize preprocessor from features
virtual bool init(CFeatures* f);
/// cleanup
virtual void cleanup();
/// initialize preprocessor from file
bool load(FILE* f);
/// save preprocessor init-data to file
bool save(FILE* f);
/// apply preproc on feature matrix
/// result in feature matrix
/// return pointer to feature_matrix, i.e. f->get_feature_matrix();
virtual bool apply_to_string_features(CFeatures* f);
/// apply preproc on single feature vector
virtual ST* apply_to_string(ST* f, int32_t &len);
/** @return object name */
virtual inline const char* get_name() const { return "DecompressString"; }
/// return a type of preprocessor TODO: template specification of get_type
virtual EPreprocessorType get_type() const;
protected:
/** compressor used to decompress strings */
CCompressor* compressor;
};
}
#endif
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